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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549





FORM 10-K







|x | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ------------------------------------------------------------------------------------

For the fiscal year ended December 31, 2008

OR



| ̈ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ----------------------------------------------------------------------------------------

For the transition period from            to

Commission file number 0-50209





Boston Properties Limited
Partnership

(Exact name of registrant as specified in its charter)







|                                                                         |  |                                        
|------------------------------------------------------------------------ |  | ---------------------------------------
|Delaware                                                                 |  | 04-3372948                             
|(State or other jurisdiction of incorporation or organization)           |  | (I.R.S. Employer Identification Number)
|                                                                         | 
|Prudential Center, 800 Boylston Street, Suite 1900 Boston, Massachusetts |  | 02199-8103                             
|(Address of principal executive offices)                                 |  | (Zip Code)                             

Registrants telephone number, including area code: (617) 236-3300





Securities registered pursuant to Section 12(b) of the Act: None

Securities registered pursuant to Section 12(g) of the Act:Units of Limited Partnership Interest (Title of Class)





Indicate by check mark if the
registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  x    No   ̈

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the
Act.    Yes   ̈    No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter
period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No   ̈

Indicate by check mark if
disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrants knowledge, in definitive proxy or information statements incorporated by reference in
Part III of this Form 10-K or any amendment to this Form 10-K.  x

Indicate by check mark
whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See definitions of large accelerated filer, accelerated filer and smaller reporting
company in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer   ̈    Accelerated filer   ̈    Non-accelerated filer x    Smaller reporting
company   ̈

Indicate by check mark whether the registrant is a shell company (as defined in
Rule 12b-2 of the Act).    Yes   ̈    No  x

Since no established market for the common units of limited partnership of the registrant exists, there is no market value for such units.

Certain information contained in Boston Properties, Inc.s Proxy Statement relating to its Annual Meeting of Stockholders to be held May 19,
2009 is incorporated by reference in Items 10, 11, 12, 13 and 14 of Part III. Boston Properties, Inc. intends to file such Proxy Statement with the Securities and Exchange Commission not later than 120 days after the end of its fiscal year ended
December 31, 2008.









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TABLE OF CONTENTS



|         |  |                                                                                                              |  |         
|-------- |  | ------------------------------------------------------------------------------------------------------------ |  | --------
|ITEM NO. |  | DESCRIPTION                                                                                                  |  | PAGE NO.
|         | 
|PART I   |  | 1                                                                                                           
|         |  |                                                                                                             
|1.       |  | BUSINESS                                                                                                     |  | 1       
|         |  |                                                                                                             
|1A.      |  | RISK FACTORS                                                                                                 |  | 17      
|         |  |                                                                                                             
|1B.      |  | UNRESOLVED STAFF COMMENTS                                                                                    |  | 33      
|         |  |                                                                                                             
|2.       |  | PROPERTIES                                                                                                   |  | 34      
|         |  |                                                                                                             
|3.       |  | LEGAL PROCEEDINGS                                                                                            |  | 39      
|         |  |                                                                                                             
|4.       |  | SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS                                                          |  | 39      
|         | 
|PART II  |  | 40                                                                                                          
|         |  |                                                                                                             
|5.       |  | MARKET FOR REGISTRANTS COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES |  | 40      
|         |  |                                                                                                             
|6.       |  | SELECTED FINANCIAL DATA                                                                                      |  | 42      
|         |  |                                                                                                             
|7.       |  | MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS                        |  | 44      
|         |  |                                                                                                             
|7A.      |  | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK                                                   |  | 98      
|         |  |                                                                                                             
|8.       |  | FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA                                                                  |  | 99      
|         |  |                                                                                                             
|9.       |  | CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE                         |  | 154     
|         |  |                                                                                                             
|9A.      |  | CONTROLS AND PROCEDURES                                                                                      |  | 154     
|         |  |                                                                                                             
|9B.      |  | OTHER INFORMATION                                                                                            |  | 154     
|         | 
|PART III |  | 155                                                                                                         
|         |  |                                                                                                             
|10.      |  | DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE                                                       |  | 155     
|         |  |                                                                                                             
|11.      |  | EXECUTIVE COMPENSATION                                                                                       |  | 155     
|         |  |                                                                                                             
|12.      |  | SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS               |  | 155     
|         |  |                                                                                                             
|13.      |  | CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE                                    |  | 156     
|         |  |                                                                                                             
|14.      |  | PRINCIPAL ACCOUNTANT FEES AND SERVICES                                                                       |  | 156     
|         | 
|PART IV  |  | 157                                                                                                         
|         |  |                                                                                                             
|15.      |  | EXHIBITS AND FINANCIAL STATEMENT SCHEDULES                                                                   |  | 157     



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PART I



|Item 1. | Business
|------- | --------

General

As used herein, the terms we, us, our, BPLP and the Company refer to Boston Properties Limited
Partnership, a Delaware limited partnership, and its subsidiaries, and their respective predecessors, considered as a single enterprise. As used in our financial statements beginning on page 99, the term Company refers to BPLP. Boston
Properties Limited Partnership is the entity through which Boston Properties, Inc., a fully integrated, self-administered and self-managed real estate investment trust, or REIT, and one of the largest owners and developers of office
properties in the United States, conducts substantially all of its business and owns (either directly or through subsidiaries) substantially all of its assets. Boston Properties, Inc.s common stock, par value $0.01 per share, is listed on the
New York Stock Exchange under the symbol BXP.

Our properties are concentrated in five marketsBoston, Washington, DC,
midtown Manhattan, San Francisco and Princeton, NJ. At December 31, 2008, we owned or had interests in 147 properties, totaling approximately 49.8 million net rentable square feet and structured parking for vehicles containing
approximately 11.2 million square feet. Our properties consisted of:



| |  |  | 143 office properties comprised of 123 Class A office properties (including 10 properties under construction) and 20 Office/Technical properties;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | one hotel; and
| | - |  | --------------



| |  |  | three retail properties.
| | - |  | ------------------------

We own or
control undeveloped land totaling approximately 509.3 acres, which will support approximately 12.0 million square feet of development. In addition, we have a minority interest in the Boston Properties Office Value-Added Fund, L.P., which we
refer to as the Value-Added Fund, which is a strategic partnership with two institutional investors through which we have pursued the acquisition of assets within our existing markets that have deficiencies in property characteristics
which provide an opportunity to create value through repositioning, refurbishment or renovation. Our investments through the Value-Added Fund are not included in our portfolio information tables or any other portfolio level statistics. At
December 31, 2008, the Value-Added Fund had investments in an office complex in San Carlos, California, an office property in Chelmsford, Massachusetts and office/technical properties in Mountain View, California.

We consider Class A office properties to be centrally-located buildings that are professionally managed and maintained, attract high-quality tenants
and command upper-tier rental rates, and that are modern structures or have been modernized to compete with newer buildings. We consider Office/Technical properties to be properties that support office, research and development, laboratory and other
technical uses. Our definitions of Class A office and Office/Technical properties may be different than those used by other companies.

We are a full-service real estate company, with substantial in-house expertise and resources in
acquisitions, development, financing, capital markets, construction management, property management, marketing, leasing, accounting, tax and legal services. We are managed by Boston Properties, Inc., in its capacity as our sole general partner. As
of December 31, 2008, we had approximately 700 employees. Our thirty-three senior officers have an average of twenty-five years experience in the real estate industry and an average of fifteen years of experience with us. Our principal
executive office and Boston regional office is located at The Prudential Center, 800 Boylston Street, Suite 1900, Boston, Massachusetts 02199 and our telephone number is (617) 236-3300. In addition, we have regional offices at 505 9thStreet, NW, Washington, DC 20004; 599 Lexington Avenue, New York, New York 10022; Four Embarcadero Center, San Francisco, California 94111; and 302 Carnegie
Center, Princeton, New Jersey 08540.

Boston Properties, Inc., our sole general partner, has a Web site located athttp://www.bostonproperties.com. On its Web site, you can obtain a free copy of Boston Properties, Inc.s and Boston Properties Limited



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Partnerships annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports filed or
furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, as soon as reasonably practicable after we electronically file such material with, or furnish it to, the Securities and Exchange Commission, or the
SEC. You may obtain BPLPs reports by accessing the EDGAR database at the Securities and Exchange Commissions website at http://www.sec.gov, or we will furnish an electronic or paper copy of these reports free of charge upon
written request to: Investor Relations, Boston Properties, Inc., The Prudential Center, 800 Boylston Street, Suite 1900, Boston, Massachusetts. The name Boston Properties and our logo (consisting of a stylized b) are
registered service marks of the Company.

Boston Properties Limited Partnership

As of February 23, 2009, Boston Properties, Inc. was the owner of approximately 84.2% of the
economic interests in BPLP. Economic interest was calculated as the number of common partnership units of BPLP owned by Boston Properties, Inc. as a percentage of the sum of (1) the actual aggregate number of outstanding common partnership
units of BPLP, (2) the number of common partnership units issuable upon conversion of outstanding preferred partnership units of BPLP and (3) the number of common units issuable upon conversion of all outstanding long term incentive plan
units of BPLP, or LTIP Units, other than LTIP Units issued in the form of 2008 Outperformance Awards, assuming all conditions have been met for the conversion of the LTIP Units. An LTIP Unit is generally the economic equivalent of a share of our
restricted common stock, although LTIP Units issued in the form of 2008 Outperformance Awards are only entitled to receive one-tenth (1/10th) of the regular quarterly distributions (and no special distributions) prior to being earned. See 2008 Outperformance Awards on page 7. Boston Properties, Inc.s general and limited partnership interests in BPLP
entitle it to share in cash distributions from, and in the profits and losses of, BPLP in proportion to its percentage interest and entitle it to vote on all matters requiring a vote of the limited partners. The other limited partners of BPLP are
persons who contributed their direct or indirect interests in properties to BPLP in exchange for common units or preferred units of limited partnership interest in BPLP or recipients of LTIP Units pursuant to the Second Amendment and Restatement of
the Boston Properties, Inc. 1997 Stock Option and Incentive Plan (the 1997 Plan). Under the limited partnership agreement of BPLP, unitholders may present their common units of BPLP for redemption at any time (subject to restrictions
agreed upon at the time of issuance of the units that may restrict such right for a period of time, generally one year from issuance). Upon presentation of a unit for redemption, BPLP must redeem the unit for cash equal to the then value of a share
of the common stock of Boston Properties, Inc. In lieu of cash, however, Boston Properties, Inc., as general partner, may, at its option, choose to acquire any common units so tendered by issuing shares of its common stock in exchange for the common
units. If Boston Properties, Inc. so elects, its common stock will be exchanged for common units on a one-for-one basis. This one-for-one exchange ratio is subject to specified adjustments to prevent dilution. We generally expect that Boston
Properties, Inc., as our general partner, will elect to issue common stock in connection with each such presentation for redemption rather than having us pay cash. With each such exchange or redemption, Boston Properties, Inc.s percentage
ownership in BPLP will increase. In addition, whenever Boston Properties, Inc. issues shares of its common stock other than to acquire common units of BPLP, it must contribute any net proceeds it receives to us and we must issue to Boston
Properties, Inc. an equivalent number of common units. This structure is commonly referred to as an umbrella partnership REIT, or UPREIT.

Our preferred units have the rights, preferences and other privileges, including the right to convert into common units, as are set forth in an amendment to our limited partnership agreement. As of December 31,
2008 and February 23, 2009, we had one series of our preferred units outstanding. Our Series Two preferred units have a liquidation preference of $50.00 per unit (or an aggregate of approximately $55.7 million at December 31, 2008 and
February 23, 2009). The Series Two preferred units are convertible, at the holders election, into common units at a conversion price of $38.10 per common unit (equivalent to a ratio of 1.312336 common units per Series Two preferred unit).
Distributions on the Series Two preferred units are payable quarterly and, unless the greater rate described in the next sentence applies, accrue at 7.0% until May 12, 2009 and 6.0% thereafter. If distributions on the number of common units
into which the Series Two preferred units are convertible are greater than distributions calculated using the rates described in the preceding sentence for the applicable



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quarterly period, then the greater distributions are payable instead. Since May 2005, distributions have been made at the greater rate determined on the
basis of distributions paid on the common units into which the Series Two preferred units are convertible. The terms of the Series Two preferred units provide that they may be redeemed for cash in six annual tranches, beginning on May 12, 2009,
at our election or at the election of the holders. We also have the right to convert into common units of BPLP any Series Two preferred units that are not redeemed when they are eligible for redemption.

Transactions During 2008

Real Estate
Acquisitions/Dispositions

On January 7, 2008, we transferred at cost Mountain View Research Park and Mountain View Technology Park
to our Value-Added Fund for an aggregate of approximately $221.6 million. The Research Park properties are comprised of sixteen Class A office and office/technical properties aggregating approximately 601,000 net rentable square feet located in
Mountain View, California. The Technology Park properties are comprised of seven office/technical properties aggregating approximately 135,000 net rentable square feet located in Mountain View, California. In consideration for the transfer, we
received approximately $98.6 million of cash and a promissory note having a principal amount of $123.0 million. The promissory note bore interest at a fixed rate of 7% per annum and was repaid in 2008. In connection with the transfer of the
Research Park and Technology Park properties to the Value-Added Fund, we and our partners agreed to certain modifications to the Value-Added Funds original terms, including bifurcating the Value-Added Funds promote structure such that
the Mountain View Research Park and Technology Park properties will be accounted for separately from the non-Mountain View properties owned by the Value-Added Fund (i.e., Circle Star and 300 Billerica Road). As a result of the modifications, our
interest in the Mountain View properties is approximately 39.5% and our interest in the non-Mountain View properties is 25%. This investment completed the investment commitments for new properties from the Value-Added Fund partners.

On April 14, 2008, we sold a parcel of land located in Washington, DC for approximately $33.7 million. We had previously entered into a development
management agreement with the buyer to develop a Class A office property on the parcel totaling approximately 165,000 net rentable square feet.

On May 12, 2008, we acquired the remaining development rights for our 250 West 55th Street development project located in New York City for an aggregate purchase price of approximately $34.2 million. The acquisition was financed with
approximately $19.2 million of cash and the issuance to the selling entity of 150,000 common units of partnership interest (also referred to as OP Units).

On June 9, 2008, we completed the acquisition of the General Motors Building at 767 Fifth Avenue in New York City for a purchase price of approximately $2.8 billion. The General Motors Building is an
approximately 1,770,000 rentable square foot office building located at the corner of 5th Avenue and Central Park South in New York City. The acquisition was completed through a joint venture with US Real Estate Opportunities I, L.P., which is a
partnership managed by Goldman Sachs, and Meraas Capital LLC, a Dubai-based private equity firm. We have a 60% interest in the venture and will provide customary property management and leasing services for the venture. The purchase price consisted
of approximately $890 million of cash, the issuance to the selling entity of 102,883 OP Units and the assumption of approximately $1.9 billion of secured and mezzanine loans having a weighted average fixed interest rate of 5.97% per annum, all
of which mature in October 2017. In addition, the venture acquired the lenders interest in a portion of the assumed mezzanine loans having an aggregate principal amount of $294.0 million and a stated interest rate of 6.02% per annum for a
purchase price of approximately $263.1 million in cash. The purchase price was financed in part with loans from the ventures partners on a pro rata basis totaling $450.0 million, which bear interest at a fixed rate of 11.0% per annum and
mature on June 9, 2017. Our share of the partner loans totaling $270.0 million has been reflected in Related Party Note Receivable on our Consolidated Balance Sheets. We have eliminated interest income from the partner loan totaling
approximately $16.9 million. In connection with the closing, we and the joint venture entered into a tax protection agreement with the seller that restricts the joint ventures ability to sell the General Motors Building in



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a taxable transaction and requires the joint venture and us to maintain certain amounts of indebtedness associated with the property and
its acquisition for a period of up to nine years.

On August 12, 2008, we completed the acquisitions of 540 Madison Avenue and Two
Grand Central Tower located in New York City, New York for an aggregate purchase price of approximately $705.0 million, including $309.9 million of assumed indebtedness. On August 13, 2008, we completed the acquisition of 125 West 55th Street
also located in New York City, New York for a purchase price of approximately $444.0 million, including $263.5 million of assumed indebtedness. Each acquisition was completed through a joint venture with US Real Estate Opportunities I, L.P. and
Meraas Capital LLC. We have a 60% interest in each venture and provide customary property management and leasing services for the ventures. The acquisitions were financed with cash contributions from the ventures partners aggregating
approximately $575.6 million and the assumption of approximately $573.4 million of secured and mezzanine loans. The debt that was assumed as part of the transactions consists of the following:



| |  |  | 540 Madison Avenuetwo secured loans having an aggregate principal amount of $119.9 million and a weighted-average fixed interest rate of 5.20% per
annum, each of which matures in July 2013;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Two Grand Central Towera $190.0 million secured loan having a fixed interest rate of 5.10% per annum, which matures in July 2010; and
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------



| |  |  | 125 West 55th Street$263.5 million of secured and mezzanine loans having a weighted-average fixed interest rate of 6.25% per annum, all of which
mature in March 2010.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------

On September 26, 2008, we acquired from National Public Radio (NPR) its
headquarters building at 635 Massachusetts Avenue (the NPR Building) comprised of approximately 211,000 net rentable square feet located in Washington, DC for a purchase price of approximately $119.5 million in cash. In addition, we
entered into a development management agreement pursuant to which we will act as development manager for NPRs new headquarters building on NPR-owned land at 1111 North Capitol Street in Washington, DC. We have entered into a lease for the NPR
Building for a five-year term at the conclusion of which NPR will occupy its new headquarters. Following the expiration of the lease with NPR, we expect to redevelop the NPR Building site into a Class A office property comprised of
approximately 450,000 net rentable square feet.

Developments

On February 5, 2008, we executed a 60-year ground lease with The George Washington University for the redevelopment of a site at Pennsylvania Avenue
and Washington Circle in the District of Columbia (2200 Pennsylvania Avenue) as a mixed-use project comprised of approximately 450,000 square feet of office and retail and 330,000 square feet of residential space. On December 18,
2008, we executed a 15-year lease with the law firm of Hunton & Williams LLP for the development project. Hunton & Williams will occupy approximately 190,000 square feet out of the approximately 450,000 square feet of office and
retail space (approximately 42%). We have commenced construction on this project and the lease is scheduled to commence in the second quarter of 2011.

On April 22, 2008, we executed a 15-year lease with Wellington Management Company, LLP for our development project located at 280 Congress Street (Russia Wharf) in Boston, Massachusetts. Wellington Management
will occupy approximately 450,000 square feet out of the approximately 552,000 square feet of office space in this approximately 815,000 net rentable square foot mixed-use project. We have commenced construction on this project and the lease is
scheduled to commence in the first quarter of 2011. In addition, we are pursuing the necessary state and local permits to change the intended use of approximately 186,000 square feet from residential to office space.

On November 26, 2008, we entered into a 15-year lease with Biogen Idec for 100% of a build-to-suit development project with approximately 356,000
net rentable square feet of Class A office space located on land



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owned by us and known as the Corporate Center of Weston in Weston, Massachusetts. We have commenced construction on this project and we expect that the
project will be complete and available for occupancy during the third quarter of 2010.

During the year ended December 31, 2008, we
placed in-service the following development properties:



| |  |  | 505 9th Street, a Class A office project with approximately 323,000 net rentable square feet located in Washington, DC (owned by a consolidated joint venture
in which we have a 50% interest);
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | 77 CityPoint, a Class A office project with approximately 210,000 net rentable square feet located in Waltham, Massachusetts;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------



| |  |  | South of Market, comprised of three Class A office properties aggregating approximately 652,000 net rentable square feet located in Reston, Virginia;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | One Preserve Parkway, a Class A office project with approximately 183,000 net rentable square feet located in Rockville, Maryland (partially placed
in-service); and
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Annapolis Junction, a Class A office project with approximately 118,000 net rentable square feet located in Annapolis, Maryland (owned by an unconsolidated
joint venture in which we have a 50% interest).
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

On
February 6, 2009, we announced that we are suspending construction on our 1,000,000 square foot office building at 250 West 55thStreet in New
York City as a result of our inability to conclude a lease transaction with a major law firm with which we had been negotiating over the last year. While we had reached agreement on financial terms with that firm, they recently informed us that they
could not proceed on those terms thereby rendering the project economically infeasible in todays environment. As a result of the decision to suspend construction, we expect to reduce our capital commitments through 2011 by approximately $450
million. We anticipate ceasing all remaining development activity late in the third quarter or early in the fourth quarter of 2009. We expect the suspension of development will reduce our 2009 capitalized interest by approximately $5 million to $9
million and will reduce 2009 capitalized wages by a modest amount. These reductions will result in corresponding incremental increases to our anticipated interest expense and general and administrative expense. We may also incur one-time costs
related to our one existing signed lease, possible write-offs of leasing commissions, arrangements in place with contractors and subcontractors for the project and other possible costs. There can be no assurance that the decision to suspend
construction will not have a material adverse effect on our results of operations.

As of December 31, 2008, we had eight projects
under construction comprised of ten buildings, which aggregate an estimated total investment of $2.3 billion and 3.8 million square feet. The investment through December 31, 2008 and estimated total investment for our properties under
construction as of December 31, 2008 are detailed below (in thousands):



|                                                      |  |                             |  |                 |  |                                         |         |                                 |   |          
|----------------------------------------------------- |  | --------------------------- |  | --------------- |  | --------------------------------------- | ------- | ------------------------------- | - | ---------
|Properties Under Construction                         |  | EstimatedStabilization Date |  | Location        |  | InvestmentthroughDecember 31,2008(1)(2) |         | Estimated TotalInvestment(1)(2)
|250 West 55thStreet (3)                               |  | N/A                         |  | New York, NY    |  | $                                       | 425,500 |                                 | $ | 980,000  
|Russia Wharf                                          |  | First Quarter, 2012         |  | Boston, MA      |  |                                         | 216,700 |                                 |   | 550,000  
|Wisconsin Place (66.67% ownership) (4)                |  | Fourth Quarter 2009         |  | Chevy Chase, MD |  |                                         | 73,600  |                                 |   | 93,500   
|Democracy Tower (formerly South of Market  Phase II) |  | Third Quarter 2009          |  | Reston, VA      |  |                                         | 58,000  |                                 |   | 87,200   
|One Preserve Parkway                                  |  | Fourth Quarter 2009         |  | Rockville, MD   |  |                                         | 47,000  |                                 |   | 60,500   
|2200 Pennsylvania Avenue                              |  | Second Quarter 2012         |  | Washington, DC  |  |                                         | 36,700  |                                 |   | 380,000  
|Weston Corporate Center                               |  | Third Quarter 2010          |  | Weston, MA      |  |                                         | 34,500  |                                 |   | 150,000  
|701 Carnegie Center                                   |  | Fourth Quarter 2009         |  | Princeton, NJ   |  |                                         | 16,800  |                                 |   | 34,000   
|                                                      |  |                             |  |                 |  |                                         |         |                                 |   |          
|Total                                                 |  |                             |  |                 |  | $                                       | 908,800 |                                 | $ | 2,335,200
|                                                      |  |                             |  |                 |  |                                         |         |                                 |   |          



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|(1) | Represents our share of the investment.
|--- | ---------------------------------------

|(2) | Includes net revenue during lease up period.
|--- | --------------------------------------------

|(3) | On February 6, 2009, we announced that we are suspending construction of this building.
|--- | ---------------------------------------------------------------------------------------

|(4) | Includes costs associated with the land and infrastructure project in which we have a 23.89% interest.
|--- | ------------------------------------------------------------------------------------------------------

Debt Transactions

On
January 29, 2008, the Wisconsin Place joint venture entity that owns and is developing the office component of the project (a consolidated joint venture entity in which we own a 66.67% interest) obtained construction financing totaling $115.0
million collateralized by the office property. Wisconsin Place is a mixed-use development project consisting of office, retail and residential properties located in Chevy Chase, Maryland. The construction financing bears interest at a variable rate
equal to LIBOR plus 1.25% per annum and matures on January 29, 2011 with two, one-year extension options.

On January 29,
2008, the Wisconsin Place joint venture entity that owns and is developing the land and infrastructure components of the project (the Land and Infrastructure Entity) (a joint venture entity in which we own an effective interest of
approximately 23.89%) executed a second amendment to its construction loan agreement. The construction financing consisted of a $69.1 million commitment, bearing interest at a per annum variable rate equal to LIBOR plus 1.50% and maturing on
March 11, 2009. The outstanding balance on the construction loan was approximately $52.6 million out of the $69.1 million commitment. The amended agreement provides for a reduction in the loan commitment amount to $36.9 million. The reduction
relates to the repayment of the office portion of the outstanding balance totaling approximately $24.9 million and an additional reduction in the borrowing capacity of approximately $7.3 million with a corresponding release of collateral in
conjunction with the Wisconsin Place joint venture entity that owns and is developing the office component of the project (a consolidated joint venture entity in which we own a 66.67% interest) obtaining new construction financing for its project.
On April 29, 2008, the Land and Infrastructure Entity repaid the balance of the construction loan totaling approximately $29.4 million. The repayment relates to the repayment of the residential portion of the outstanding balance in conjunction
with the Wisconsin Place joint venture entity that owns and is developing the residential component of the project (a joint venture entity in which we do not own an interest) obtaining new construction financing for its project.

On February 1, 2008, we used available cash to repay the mortgage loan collateralized by our Reston Corporate Center property located in Reston,
Virginia totaling approximately $20.5 million. There was no prepayment penalty associated with the repayment. The mortgage loan bore interest at a fixed rate of 6.56% per annum and was scheduled to mature on May 1, 2008.

On March 27, 2008, our Value-Added Fund obtained third-party mortgage financing totaling $26.0 million (of which $24.0 million was drawn at closing and
approximately $38,000 was drawn to fund tenant and capital costs, with the remaining amount available to fund future tenant and capital costs) collateralized by the Mountain View Technology Park properties. The third-party mortgage financing bears
interest at a variable rate equal to LIBOR plus 1.50% per annum and matures on March 31, 2011 with two, one-year extension options. The proceeds of the third-party mortgage financing were used to repay $23.0 million of the financing provided by us.
On June 12, 2008, the Value-Added Fund entered into an interest rate swap contract related to the mortgage loan collateralized by the Mountain View Technology Park properties with a notional amount of $24.0 million to fix the one-month LIBOR index
rate at 4.085% per annum through maturity on March 31, 2011.

On April 1, 2008, we used available cash to repay the mortgage loan
collateralized by our Prudential Center property located in Boston, Massachusetts totaling approximately $258.2 million. There was no prepayment penalty associated with the repayment. The mortgage loan bore interest at a fixed rate of 6.72% per
annum and was scheduled to mature on July 1, 2008.

On May 30, 2008, our Value-Added Fund obtained mortgage financing totaling $120.0
million (of which $103.0 million was drawn at closing, $3.3 million was drawn to fund tenant and capital costs, with the remaining



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$13.7 million available to fund future tenant and capital costs) collateralized by the Mountain View Research Park properties. The mortgage financing bears
interest at a variable rate equal to LIBOR plus 1.75% per annum and matures on May 31, 2011 with two, one-year extension options. The Value-Added Fund entered into three interest rate swap contracts with notional amounts aggregating $103.0 million
to fix the one-month LIBOR index rate at 3.63% per annum through April 1, 2011. The proceeds of the mortgage financing were used to repay the remaining $100.0 million of financing provided by us.

On June 19, 2008, we obtained construction financing totaling $65.0 million collateralized by our Democracy Tower (formerly South of
MarketPhase II) development project located in Reston, Virginia. The Democracy Tower development project consists of a Class A office property with approximately 225,000 net rentable square feet. The construction financing bears interest
at a variable rate equal to LIBOR plus 1.75% per annum and matures on December 19, 2010 with two, one-year extension options.

On
September 10, 2008, we used available cash to repay the mortgage loan collateralized by our One and Two Embarcadero Center properties located in San Francisco, California totaling approximately $274.8 million. There was no prepayment penalty
associated with the repayment. The mortgage loan bore interest at a fixed rate of 6.74% per annum and was scheduled to mature on December 10, 2008.

On October 10, 2008, we used available cash to repay the mortgage loan collateralized by our Bedford Business Park properties located in Bedford, Massachusetts totaling approximately $16.1 million. There was no
prepayment penalty associated with the repayment. The mortgage loan bore interest at a fixed rate of 8.60% per annum and was scheduled to mature on December 10, 2008.

On November 13, 2008, we closed on an eight-year, $375.0 million mortgage loan collateralized by Four Embarcadero Center located in San Francisco,
California. The mortgage loan bears interest at a fixed rate of 6.10% per annum. Under our interest rate hedging program, we will reclassify into earnings over the eight-year term of the loan as an increase in interest expense approximately
$26.4 million (approximately $3.3 million per year) of the amounts recorded on our Consolidated Balance Sheet within Accumulated Other Comprehensive Loss, which amounts represent the effective portion of the applicable interest rate hedging
contracts. .

Equity Transactions

During the year ended December 31, 2008, Boston Properties, Inc. redeemed an aggregate of 631,297 common units of limited partnership interest, including 16,147 common units issued upon the conversion of LTIP
Units, presented by the holders for redemption, in exchange for an equal number of shares of common stock. Each time Boston Properties, Inc. issues shares of common stock (other than in exchange for common units upon exercise by limited partners of
their redemption right), it contributes the proceeds of such issuance to us in return for an equivalent number of common units. During the year ended December 31, 2008, we issued 1,058,133 units to Boston Properties, Inc.s in exchange for
the proceeds from the exercises of stock options under the 1997 Plan.

Exchangeable Notes Offering

On August 19, 2008, we completed an offering of $747.5 million in aggregate principal amount (including $97.5 million as a result of the exercise by
the initial purchasers of their over-allotment option) of our 3.625% exchangeable senior notes due 2014. The notes were priced at 99.0% of their face amount, resulting in aggregate net proceeds to us, after deducting the initial purchasers
discounts and offering expenses, of approximately $731.6 million, resulting in an effective interest rate of approximately 4.037% per annum. The notes mature on February 15, 2014, unless earlier repurchased, exchanged or redeemed. On
and after January 1, 2014, the notes may be exchanged at any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date at the option of the holders into cash up to their principal amount and, at
our option, cash or shares of Boston Properties, Inc.s common stock for the remainder, if any, of the exchange value in excess of such principal amount at the applicable exchange rate, which initially equals 8.5051 shares per $1,000 principal
amount



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of notes (or an initial exchange price of approximately $117.58 per share of Boston Properties, Inc.s common stock). Prior to the close of business on
the scheduled trading day immediately preceding January 1, 2014, holders of the notes may only exchange their notes only upon the occurrence of certain events. The notes were issued in an offering exempt from registration under the Securities Act of
1933. In addition, in connection with the offering, we entered into capped call transactions with affiliates of certain of the initial purchasers, which are intended to reduce the potential dilution upon future exchange of the notes. The capped
call transactions are expected to have the effect of increasing the effective exchange price to us of the notes from $117.58 to approximately $137.17 per share of Boston Properties, Inc.s common stock, representing an overall effective premium
of approximately 40% over the closing price of $97.98 per share of Boston Properties, Inc.s common stock on August 13, 2008. The net cost of the capped call transactions was approximately $44.4 million. (See Note 8 to the Consolidated
Financial Statements.)

2008 Outperformance Awards

On January 24, 2008, the Compensation Committee (the Committee) of the Board of Directors of Boston Properties, Inc. approved outperformance awards under the 1997 Plan to officers and key employees of
Boston Properties, Inc. These awards (the 2008 OPP Awards) are part of a broad-based, long-term incentive compensation program designed to provide our management team at several levels within the organization with the potential to earn
equity awards subject to Boston Properties, Inc.s outperforming and creating shareholder value in a pay-for-performance structure. 2008 OPP Awards utilize Boston Properties, Inc.s total return to shareholders
(TRS) over a three-year measurement period as the performance metric and include two years of time-based vesting after the end of the performance measurement period (subject to acceleration in certain events) as a retention tool.
Recipients of 2008 OPP Awards will share in an outperformance pool if Boston Properties, Inc.s TRS, including both share appreciation and dividends, exceeds absolute and relative hurdles over a three-year measurement period from
February 5, 2008 to February 5, 2011, based on the average closing price of a share of Boston Properties, Inc.s common stock of $92.8240 for the five trading days prior to and including February 5, 2008. Assuming no changes in
Boston Properties, Inc.s aggregate annual per share dividend through February 2011, Boston Properties, Inc.s common stock price would have to exceed $104.15 per share for recipients of 2008 OPP Awards to be eligible to earn any rewards.
The aggregate reward that recipients of all 2008 OPP Awards can earn, as measured by the outperformance pool, is subject to a maximum cap of $110 million, although OPP Awards for an aggregate of up to approximately $104.8 million have been
allocated to date and were granted on February 5, 2008. The balance remains available for future grants, with OPP Awards exceeding a potential reward of $1 million requiring the approval of the Committee (See Note 18 to the Consolidated
Financial Statements).

Business and Growth Strategies

Business Strategy

Our primary business objective is to maximize return on investment so as to
provide our investors with the greatest possible total return. Our strategy to achieve this objective is:



| |  |  | to concentrate on a few carefully selected geographic markets, including Boston, Washington, DC, midtown Manhattan, San Francisco and Princeton, NJ, and to be one
of the leading, if not the leading, owners and developers in each of those markets. We select markets and submarkets where tenants have demonstrated a preference for high-quality office buildings and other facilities;
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| |  |  | to emphasize markets and submarkets within those markets where the lack of available sites and the difficulty of receiving the necessary approvals for development
and the necessary financing constitute high barriers to the creation of new supply, and where skill, financial strength and diligence are required to successfully develop, finance and manage high-quality office, research and development space, as
well as selected retail space;
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| |  |  | to take on complex, technically challenging projects, leveraging the skills of our management team to successfully develop, acquire or reposition properties that
other organizations may not have the capacity or resources to pursue;
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| |  |  | to concentrate on high-quality real estate designed to meet the demands of todays tenants who require sophisticated telecommunications and related
infrastructure and support services, and to manage those facilities so as to become the landlord of choice for both existing and prospective clients;
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| |  |  | to opportunistically acquire assets which increase our penetration in the markets in which we have chosen to concentrate and which exhibit an opportunity to improve
or preserve returns through repositioning (through a combination of capital improvements and shift in marketing strategy), changes in management focus and re-leasing as existing leases terminate;
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| |  |  | to explore joint venture opportunities primarily with existing owners of land parcels located in desirable locations, who seek to benefit from the depth of
development and management expertise we are able to provide and our access to capital, and/or to explore joint venture opportunities with strategic institutional partners, leveraging our skills as owners, operators and developers of Class A
office space, as well as partners with expertise in mixed-use opportunities;
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| |  |  | to pursue on a selective basis the sale of properties, including core properties, to take advantage of our value creation and the demand for our premier properties;
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| |  |  | to seek third-party development contracts, which can be a significant source of revenue and enable us to retain and utilize our existing development and
construction management staff, especially when our internal development is less active or when new development is less-warranted due to market conditions; and
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| |  |  | to enhance our capital structure through our access to a variety of sources of capital.
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Growth Strategies

External Growth

We believe that our development experience and our organizational depth position us to continue to selectively develop a range of property types,
including low-rise suburban office properties, high-rise urban developments, mixed-use developments and research and laboratory space, within budget and on schedule. Other factors that contribute to our competitive position include:



| |  |  | our control of sites (including sites under contract or option to acquire) in our markets that will support approximately 12.0 million square feet of new
office, retail, hotel and residential development;
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| |  |  | our reputation gained through 39 years of successful operations and the stability and strength of our existing portfolio of properties;
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| |  |  | our relationships with leading national corporations and public institutions seeking new facilities and development services;
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| |  |  | our relationships with nationally recognized financial institutions that provide capital to the real estate industry;
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| |  |  | our track record and reputation for executing acquisitions efficiently provides comfort to domestic and foreign institutions, private investors and corporations who
seek to sell commercial real estate in our market areas;
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| |  |  | our ability to act quickly on due diligence and financing; and
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| |  |  | our relationships with institutional buyers and sellers of high-quality real estate assets.
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Opportunities to execute our external growth strategy fall into three categories:



| |  |  | Development in selected submarkets.We believe the continued development of well-positioned office buildings will be justified in many of our submarkets. We
believe in acquiring land after taking into consideration timing factors relating to economic cycles and in response to market conditions that allow for its development at the appropriate time. While we purposely concentrate in markets with high
barriers-to-entry, we have demonstrated throughout our 39-year history, an ability to make carefully timed land acquisitions in submarkets where we can become one of the market leaders in establishing rent and other business terms. We believe that
there are opportunities at key locations in our existing and other markets for a well-capitalized developer to acquire land with development potential.
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In the past, we have been particularly successful at acquiring sites or options to purchase sites that need governmental approvals for development. Because of our development expertise, knowledge of the governmental
approval process and reputation for quality development with local government regulatory bodies, we generally have been able to secure the permits necessary to allow development and to profit from the resulting increase in land value. We seek
complex projects where we can add value through the efforts of our experienced and skilled management team leading to attractive returns on investment.

Our strong regional relationships and recognized development expertise have enabled us to capitalize on unique build-to-suit opportunities. We intend to seek and expect to continue to be presented with such
opportunities in the near term allowing us to earn relatively significant returns on these development opportunities through multiple business cycles.



| |  |  | Acquisition of assets and portfolios of assets from institutions or individuals.We believe that due to our size, management strength and reputation, we are
well positioned to acquire portfolios of assets or individual properties from institutions or individuals if valuations meet our criteria. In addition, we believe that our relatively low leverage and our liquidity and access to capital may provide
us with a competitive advantage when pursuing acquisitions in the current credit-constrained environment. There may be enhanced opportunities to purchase assets with near-term financing maturities or possibly provide debt on assets at enhanced
yields given the limited availability of traditional sources of debt. We may acquire properties for cash, but we are also particularly well-positioned to appeal to sellers wishing to contribute on a tax-deferred basis their ownership of property for
equity in a diversified real estate operating company that offers liquidity through access to the public equity markets in addition to a quarterly distribution. Our ability to offer common and preferred units of limited partnership in BPLP to
sellers who would otherwise recognize a taxable gain upon a sale of assets for cash or Boston Properties, Inc.s common stock may facilitate this type of transaction on a tax-efficient basis. In addition, we may consider mergers with and
acquisitions of compatible real estate firms.
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| |  |  | Acquisition of underperforming assets and portfolios of assets. We believe that because of our in-depth market knowledge and development experience in each
of our markets, our national reputation with brokers, financial institutions and others involved in the real estate market and our access to competitively-priced capital, we are well-positioned to identify and acquire existing, underperforming
properties for competitive prices and to add significant additional value to such properties through our effective marketing strategies and a responsive property management program. We have developed this strategy and program for our existing
portfolio, where we provide high-quality property management services using our own employees in order to encourage tenants to renew, expand and relocate in our properties. We are able to achieve speed and transaction cost efficiency in replacing
departing tenants through the use of in-house and third-party vendors services for marketing, including calls and presentations to prospective tenants, print advertisements, lease negotiation and construction of tenant improvements. Our
tenants benefit from cost efficiencies produced by our experienced work force, which is attentive to preventive maintenance and energy management.
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Internal Growth

We believe that opportunities will exist to increase cash flow from our existing properties because they are of high quality and in desirable locations. In addition, our properties are in markets where, in general,
the creation of new supply is limited by the lack of available sites, the difficulty of receiving the necessary approvals for development on vacant land and the difficulty of obtaining financing. Our strategy for maximizing the benefits from these
opportunities is three-fold: (1) to provide high-quality property management services using our employees in order to encourage tenants to renew, expand and relocate in our properties, (2) to achieve speed and transaction cost efficiency
in replacing departing tenants through the use of in-house services for marketing, lease negotiation and construction of tenant improvements and (3) to work with new or existing tenants with space expansion or contraction needs maximizing the
cash flow from our assets. We believe that our office properties will add to our internal growth because of their desirable locations and the fact that our in-place rents are currently lower than market rents. We expect to continue our internal
growth as a result of our ability to:



| |  |  | Cultivate existing submarkets and long-term relationships with credit tenants. In choosing locations for our properties, we have paid particular attention to
transportation and commuting patterns, physical environment, adjacency to established business centers, proximity to sources of business growth and other local factors.
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We had an average lease term of 7.2 years at December 31, 2008 and continue to cultivate long-term leasing relationships with a diverse base of high
quality, financially stable tenants. Based on leases in place at December 31, 2008, leases with respect to 6.7% of the total square feet in our portfolio will expire in calendar year 2009.



| |  |  | Directly manage properties to maximize the potential for tenant retention. We provide property management services ourselves, rather than contracting for
this service, to maintain awareness of and responsiveness to tenant needs. We and our properties also benefit from cost efficiencies produced by an experienced work force attentive to preventive maintenance and energy management and from our
continuing programs to assure that our property management personnel at all levels remain aware of their important role in tenant relations.
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| |  |  | Replace tenants quickly at best available market terms and lowest possible transaction costs. We believe that we are well-positioned to attract new tenants
and achieve relatively high rental rates as a result of our well-located, well-designed and well-maintained properties, our reputation for high-quality building services and responsiveness to tenants, and our ability to offer expansion and
relocation alternatives within our submarkets.
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| |  |  | Extend terms of existing leases to existing tenants prior to expiration. We have also successfully structured early tenant renewals, which have reduced the
cost associated with lease downtime while securing the tenancy of our highest quality credit-worthy tenants on a long-term basis and enhancing relationships.
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Policies with Respect to Certain Activities

The discussion below sets forth certain additional
information regarding our investment, financing and other policies. These policies have been determined by the Board of Directors of Boston Properties, Inc. and, in general, may be amended or revised from time to time by the Board of Directors of
Boston Properties, Inc.

Investment Policies

Investments in Real Estate or Interests in Real Estate

Our investment objectives are to provide
quarterly cash distributions to our securityholders and to achieve long-term capital appreciation through increases in the value of BPLP. We have not established a specific policy regarding the relative priority of these investment objectives.



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We expect to continue to pursue our investment objectives primarily through the ownership of our current
properties, development projects and other acquired properties. We currently intend to continue to invest primarily in developments of properties and acquisitions of existing improved properties or properties in need of redevelopment, and
acquisitions of land that we believe have development potential, primarily in our marketsBoston, Washington, DC, midtown Manhattan, San Francisco and Princeton, NJ. Future investment or development activities will not be limited to a specified
percentage of our assets. We intend to engage in such future investment or development activities in a manner that is consistent with the maintenance of Boston Properties, Inc.s status as a REIT for federal income tax purposes. In addition, we
may purchase or lease income-producing commercial and other types of properties for long-term investment, expand and improve the real estate presently owned or other properties purchased, or sell such real estate properties, in whole or in part,
when circumstances warrant. We do not have a policy that restricts the amount or percentage of assets that will be invested in any specific property, however, our investments may be restricted by our debt covenants.

We may also continue to participate with third parties in property ownership, through joint ventures or other types of co-ownership, including third
parties with expertise in mixed-use opportunities. These investments may permit us to own interests in larger assets without unduly restricting diversification and, therefore, add flexibility in structuring our portfolio.

Equity investments may be subject to existing mortgage financing and other indebtedness or such financing or indebtedness as may be incurred in
connection with acquiring or refinancing these investments. Debt service on such financing or indebtedness will have a priority over any distributions with respect to the common stock of Boston Properties, Inc. Investments are also subject to our
policy not to be treated as an investment company under the Investment Company Act of 1940, as amended (the 1940 Act).

Investments in Real Estate Mortgages

While our current portfolio consists of, and our business objectives emphasize, equity
investments in commercial real estate, we may, at the discretion of the Board of Directors of Boston Properties, Inc., invest in mortgages and other types of real estate interests consistent with Boston Properties, Inc.s qualification as a
REIT. Investments in real estate mortgages run the risk that one or more borrowers may default under such mortgages and that the collateral securing such mortgages may not be sufficient to enable us to recoup our full investment. Although we
currently do not have any investments in mortgages or deeds of trust, we may invest in participating or convertible mortgages if we conclude that we may benefit from the cash flow or any appreciation in value of the property.

Securities of or Interests in Persons Primarily Engaged in Real Estate Activities

Subject to the percentage of ownership limitations and gross income tests necessary for Boston Properties, Inc.s REIT qualification, we also may
invest in securities of other REITs, other entities engaged in real estate activities or securities of other issuers, including for the purpose of exercising control over such entities.

Dispositions

Our disposition of properties is based upon the periodic review of our portfolio
and the determination by the Board of Directors of Boston Properties, Inc. that such action would be in our best interests. Any decision to dispose of a property will be authorized by the Board of Directors of Boston Properties, Inc. or a committee
thereof. Some holders of our limited partnership interests, including Mortimer B. Zuckerman and Edward H. Linde, would incur adverse tax consequences upon the sale of certain of our properties that differ from the tax consequences to us and Boston
Properties, Inc. Consequently, holders of our limited partnership interests may have different objectives regarding the appropriate pricing and timing of any such sale. Such different tax treatment derives in most cases from the fact that we
acquired these properties in exchange for our partnership interests in contribution transactions structured to allow the prior owners to defer taxable gain. Generally this deferral continues so long as we do not dispose of the properties in a
taxable transaction. Unless a sale by us of these properties is structured as a like-kind



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exchange under Section 1031 of the Internal Revenue Code or in a manner that otherwise allows deferral to continue, recognition of the deferred tax gain
allocable to these prior owners is generally triggered by the sale. Some of our assets are subject to tax protection agreements, which may limit our ability to dispose of the assets or require us to pay damages to the prior owners in the event of a
taxable sale.

Financing Policies

Our agreement of limited partnership and the certificate of incorporation and bylaws of Boston Properties, Inc. do not limit the amount or percentage of indebtedness that we may incur. We do not have a policy limiting the amount of
indebtedness that we may incur. However, our mortgages, credit facilities and unsecured debt securities contain customary restrictions, requirements and other limitations on our ability to incur indebtedness. We have not established any limit on the
number or amount of mortgages that may be placed on any single property or on our portfolio as a whole.

The Board of Directors of Boston
Properties, Inc. will consider a number of factors when evaluating our level of indebtedness and when making decisions regarding the incurrence of indebtedness, including the purchase price of properties to be acquired with debt financing, the
estimated market value of our properties upon refinancing, the entering into agreements such as interest rate swaps, caps, floors and other interest rate hedging contracts and the ability of particular properties and BPLP as a whole to generate cash
flow to cover expected debt service.

Policies with Respect to Other Activities

Boston Properties, Inc., as our sole general partner, has the authority to issue additional common and preferred units of limited partnership interest of
BPLP. Boston Properties, Inc. has in the past, and may in the future, issue common or preferred units of BPLP to persons who contribute their direct or indirect interests in properties to us in exchange for such units. We have not engaged in
trading, underwriting or agency distribution or sale of securities of issuers and we do not intend to do so. At all times, we intend to make investments in such a manner as to maintain Boston Properties, Inc.s qualification as a REIT, unless
because of circumstances or changes in the Internal Revenue Code of 1986, as amended (or the Treasury Regulations), the Board of Directors of Boston Properties, Inc. determines that it is no longer in the best interest of Boston Properties, Inc. to
qualify as a REIT. We may make loans to third parties, including, without limitation, to joint ventures in which we participate. We intend to make investments in such a way that we will not be treated as an investment company under the 1940 Act. Our
policies with respect to these and other activities may be reviewed and modified or amended from time to time by the Board of Directors of Boston Properties, Inc.

Energy and Natural Resource Conservation

As one of the largest owners and developers of office properties in the
United States, we strive to limit our energy and natural resource consumption through active management at our properties. On an annual basis, our property managers identify capital improvement projects and building systems enhancements that have
the potential to reduce the use of energy at each property. The identified projects and enhancements are then reviewed with senior management, and the projects and enhancements that offer material energy or resource savings and meet our investment
criteria are then implemented.

In 2008, this process was improved through a more holistic, corporate-wide approach. Our management team
formed a Sustainability Committee to (1) identify and execute new strategies for promoting sustainability in new construction, existing buildings and corporate operations, (2) promote communication across regions, (3) share best
practices and (4) assess the cost effectiveness of small and large scale projects and programs. Over the past several years, we have implemented numerous improvement projects and system enhancements, including, without limitation, the
following:



| |  |  | installation of higher efficiency lighting in public spaces, garages, stairways and elevators;
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| |  |  | installation of new, high-efficiency motors, air compressors, chillers and other heating, ventilation and air conditioning (HVAC) system components;
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| |  |  | replacing and upgrading energy management systems, including installation of carbon dioxide controls;
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| |  |  | installation of solar reflective window film to reduce solar heat gain, glare and ultraviolet radiation, and adding wall and ceiling insulation to reduce thermal
losses;
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| |  |  | modernizing cooling towers with high-efficiency fill and distribution pans;
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| |  |  | implementing programs to minimize waste of water and reclaim steam condensate for our cooling towers;
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| |  |  | upgrading water treatment, plumbing and irrigation operations; and
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| |  |  | implementing extensive recycling programs.
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In addition to the physical improvements and systems enhancements described above, our property managers also benchmark building energy and resource consumption with the goal of optimizing equipment use and operation. Across our regions we
provide training for our property management staff and strive to make our tenants more aware of energy codes and energy saving opportunities. For example, we have worked collaboratively with our tenants at many of our buildings to implement new
policies for providing HVAC on weekends only upon request. We also continue to increase the use of shuttle services between certain of our properties and the local bus and subway stations to encourage the use of mass transportation. These management
initiatives are intended to not only help reduce energy consumption in the short term, but also heighten awareness of the issue to help ensure energy efficiency over the long term.

Properties across our portfolio are routinely rated and benchmarked on the U.S. Environmental
Protection Agencys Energy Star® program. In 2008, 17 of our properties earned the Energy Star Award, accounting for over 7.8 million square feet of exemplary energy performance,
and we expect additional properties across our portfolio will receive the same recognition in 2009. We believe our efforts described above have led to a meaningful reduction in the number of kilowatt-hours (kWh) used in the operation of
our properties and a reduction in our operating expenses. We estimate that the efforts we undertook in 2008 alone will reduce the amount of electrical usage throughout our portfolio by millions of kWh per year.

In addition to the efforts described above, we participate in utility rebate programs when making significant capital improvements and, when economically
practicable, we subscribe to long-term, fixed utility contracts on a regional basis.

On an annual basis, we intend to continue to explore
ways of reducing our energy consumption and related expenses, and conserving natural resources, across our portfolio.

Environmentally Sound
Development

Green buildings are designed, constructed and
operated to provide greater environmental, economic, health and productivity performance than conventional buildings. As a developer, we participate in the U.S. Green Building Councils Leadership in Energy and Environmental Design (LEED)
program. The LEED Green Building Rating System® is a voluntary, consensus-based national standard of design guidelines for high-performance, sustainable Green buildings. The
USGBCs LEED certification follows a rigorous registration process which evaluates and gives Certified, Silver, Gold, and Platinum ratings to green buildings.

We currently have LEED registered projects under development and placed in service throughout our portfolio, including the following:



| |  |  | 77 CityPoint in Waltham, MAThis approximately 210,000 square foot Class A office property in Waltham, MA has been certified Gold LEED.
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| |  |  | Annapolis Junction in Annapolis, MD This approximately 118,000 square foot Class A office property has been pre-certified Silver LEED.
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| |  |  | Russia Wharf in Boston, MA This 815,000 square foot Class A office tower has been pre-certified Gold LEED.
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| |  |  | 2200 Pennsylvania Avenue, Washington, DC This 780,000 square foot Class A office property has been pre-certified Silver LEED.
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| |  |  | Democracy Tower, Reston, VA This 225,000 square foot Class A office property has been pre-certified Silver LEED.
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Numerous other development projects are LEED registered and targeting LEED Silver ratings or better. In addition, we actively seek opportunities to
achieve LEED ratings on commercial interiors as tenants build-out or renovate their space. We have numerous commercial interior projects either planned or currently under construction that have been designed to achieve LEED certification, and we
have already completed various projects that either already received, or we expect will receive, LEED certifications, including our headquarters in the Prudential Center in Boston.

Many of the local jurisdictions in which we operate and develop buildings are also making efforts to promote environmentally sound developments by
adopting aspects of the LEED program. As a result, we intend to continue to be proactive in evaluating each new development to determine whether it is physically practical and economically feasible to produce a LEED certified building. Barring
unusual use, site or design constraints, we target LEED-Silver or better on all new developments.

Competition

We compete in the leasing of office space with a considerable number of other real estate companies, some of which may have greater marketing and
financial resources than are available to us. In addition, our hotel property competes for guests with other hotels, some of which may have greater marketing and financial resources than are available to us and to the manager of our one hotel,
Marriott International, Inc.

Principal factors of competition in our primary business of owning, acquiring and developing office
properties are the quality of properties, leasing terms (including rent and other charges and allowances for tenant improvements), attractiveness and convenience of location, the quality and breadth of tenant services provided, and reputation as an
owner and operator of quality office properties in the relevant market. Additionally, our ability to compete depends upon, among other factors, trends of the national and local economies, investment alternatives, financial condition and operating
results of current and prospective tenants, availability and cost of capital, construction and renovation costs, taxes, utilities, governmental regulations, legislation and population trends.

Our Hotel Property

We operate our hotel property through a taxable REIT
subsidiary. The taxable REIT subsidiary, our wholly-owned subsidiary, is the lessee pursuant to leases for the hotel property. As lessor, we are entitled to a percentage of gross receipts from the hotel property. The hotel lease allows all the
economic benefits of ownership to flow to us. Marriott International, Inc. continues to manage the hotel property under the Marriott name and under terms of the existing management agreements. Marriott has been engaged under a separate long-term
incentive management agreement to operate and manage the hotel on behalf of the taxable REIT subsidiary. In connection with these arrangements, Marriott has agreed to operate and maintain our hotel in accordance with its system-wide standard for
comparable hotels and to provide the hotel with the benefits of its central reservation system and other chain-wide programs and services. Under a management agreement for the hotel, Marriott acts as the taxable REIT subsidiarys agent to
supervise, direct and control the management and operation of the hotel and receives as compensation base management fees that are calculated as a percentage of the hotels gross revenues,



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and supplemental incentive fees if the hotel exceeds negotiated profitability breakpoints. In addition, the taxable REIT subsidiary compensates Marriott, on
the basis of a formula applied to the hotels gross revenues, for certain system-wide services provided by Marriott, including central reservations, marketing and training. During 2008, 2007 and 2006, Marriott received an aggregate of
approximately $3.0 million, $3.2 million and $4.7 million, respectively, from our taxable REIT subsidiary. For 2006 and a portion of 2007, these amounts include payments related to the Long Wharf Marriott, which was sold by us in March 2007.

Seasonality

Our hotel
property traditionally has experienced significant seasonality in its operating income, with the percentage of net operating income by quarter over the year ended December 31, 2008 shown below.



|              |  |                |  |               |  |               
|------------- |  | -------------- |  | ------------- |  | --------------
|First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
|7%            |  | 35%            |  | 23%           |  | 35%           

Corporate Governance

Our sole general partner, Boston Properties, Inc., is currently managed by a ten member Board of Directors, which is divided into three classes (Class I,
Class II and Class III). The Board of Directors of Boston Properties, Inc. is currently composed of three Class I directors (Mortimer B. Zuckerman, Carol B. Einiger and Richard E. Salomon), four Class II directors (Lawrence S. Bacow, Zoë Baird,
Alan J. Patricof and Martin Turchin) and three Class III directors (Fredrick J. Iseman, Edward H. Linde and David A. Twardock). The members of each class of the Board of Directors of Boston Properties, Inc. serve for staggered three-year terms, and
the terms of the current Class I, Class II and Class III directors expire upon the election and qualification of directors at the annual meetings of stockholders of Boston Properties, Inc. to be held in 2010, 2011 and 2009, respectively. At each
annual meeting of stockholders of Boston Properties, Inc., directors will be elected or re-elected for a full term of three years to succeed those directors whose terms are expiring.

Frederick J. Iseman was appointed to serve as a new independent member of the Board of Directors of Boston Properties, Inc. on December 15,
2008. Mr. Iseman is Chairman and Chief Executive Officer of CI Capital Partners LLC, a private equity investment firm which he founded in 1993. In addition, the Board appointed Mr. Iseman to the Compensation Committee effective
January 1, 2009.

Boston Properties, Inc.s Board of Directors has Audit, Compensation and Nominating and Corporate Governance
Committees. The membership of each of these committees is described below.



|                   |  |       |   |  |              |   |  |                                   |  
|------------------ |  | ----- | - |  | ------------ | - |  | --------------------------------- | -
|Name of Director   |  | Audit |   |  | Compensation |   |  | Nominating andCorporateGovernance |  
|Lawrence S. Bacow  |  | X     |   |  |              |   |  |                                   |  
|Zoë Baird          |  |       |   |  | X            |   |  | X                                 | *
|Carol B. Einiger   |  | X     |   |  |              |   |  |                                   |  
|Fredrick J. Iseman |  |       |   |  | X            |   |  |                                   |  
|Alan J. Patricof   |  | X     | * |  |              |   |  |                                   |  
|Richard E. Salomon |  |       |   |  | X            | * |  |                                   |  
|David A. Twardock  |  |       |   |  | X            |   |  | X                                 |  



X=Committee member, *=Chair

| |  |  | The Board of Directors of Boston Properties, Inc. has adopted charters for each of its Audit, Compensation and Nominating and Corporate Governance Committees. The
Compensation Committee is comprised of four (4) independent directors. The Audit Committee is comprised of three
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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| | (3) independent directors, and the Nominating and Corporate Governance Committee is comprised of two (2) independent directors. A copy of each of
these charters is available on Boston Properties, Inc.s website at http://www.bostonproperties.com under the heading Corporate Governance and subheading Committees and Charters. A copy of each of these charters is also
available in print upon written request addressed to Investor Relations, Boston Properties, Inc., The Prudential Center, 800 Boylston Street, Boston, MA 02199.
| | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | The Board of Directors of Boston Properties, Inc. has adopted Corporate Governance Guidelines, a copy of which is available on Boston Properties, Inc.s
website at http://www.bostonproperties.com under the heading Corporate Governance and subheading Governance Guidelines. A copy of these guidelines is also available in print upon written request addressed to Investor
Relations, Boston Properties, Inc., The Prudential Center, 800 Boylston Street, Boston, MA 02199.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | The Board of Directors of Boston Properties, Inc. has adopted a Code of Business Conduct and Ethics, which governs business decisions made and actions taken by the
directors, officers and employees of Boston Properties, Inc. A copy of this code is available on Boston Properties, Inc.s website at http://www.bostonproperties.com under the heading Corporate Governance and subheading Code
of Conduct and Ethics. We intend to disclose on this website any amendment to, or waiver of, any provision of this Code applicable to the directors and executive officers of Boston Properties, Inc. that would otherwise be required to be
disclosed under the rules of the SEC or the New York Stock Exchange. A copy of this Code is also available in print upon written request addressed to Investor Relations, Boston Properties, Inc., The Prudential Center, 800 Boylston Street, Boston, MA
02199.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | The Board of Directors of Boston Properties, Inc. has established an ethics reporting system that employees may use to anonymously report possible violations of the
Code of Business Conduct and Ethics, including concerns regarding questionable accounting, internal accounting controls or auditing matters, by telephone or over the internet.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | On May 22, 2008, Edward H. Linde, Chief Executive Officer of Boston Properties, Inc., submitted to the New York Stock Exchange (the NYSE) the
Annual CEO Certification required by Section 303A of the Corporate Governance Rules of the NYSE certifying that he was not aware of any violation by Boston Properties, Inc. of NYSE corporate governance listing standards.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|Item 1A. | Risk Factors.
|-------- | -------------

Set forth
below are the risks that we believe are material to our investors. We refer to our common, preferred and LTIP Units together as our securities, and the investors who own our securities as our securityholders. This section
contains forward-looking statements. You should refer to the explanation of the qualifications and limitations on forward-looking statements beginning on page 44.

Our performance and value are subject to risks associated with our real estate assets and with the real estate industry.

Our economic performance and the value of our real estate assets, and consequently the value of our securities, are subject to the risk that if our office and hotel properties do not generate revenues sufficient to
meet our operating expenses, including debt service and capital expenditures, our cash flow and ability to pay distributions to our securityholders will be adversely affected. The following factors, among others, may adversely affect the income
generated by our office and hotel properties:



| |  |  | downturns in the national, regional and local economic conditions (particularly increases in unemployment);
| | - |  | -----------------------------------------------------------------------------------------------------------



| |  |  | competition from other office, hotel and commercial buildings;
| | - |  | --------------------------------------------------------------



| |  |  | local real estate market conditions, such as oversupply or reduction in demand for office, hotel or other commercial space;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------



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| |  |  | changes in interest rates and availability of financing;
| | - |  | --------------------------------------------------------



| |  |  | vacancies, changes in market rental rates and the need to periodically repair, renovate and re-let space;
| | - |  | ---------------------------------------------------------------------------------------------------------



| |  |  | increased operating costs, including insurance expense, utilities, real estate taxes, state and local taxes and heightened security costs;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | civil disturbances, earthquakes and other natural disasters, or terrorist acts or acts of war which may result in uninsured or underinsured losses;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | significant expenditures associated with each investment, such as debt service payments, real estate taxes, insurance and maintenance costs which are generally not
reduced when circumstances cause a reduction in revenues from a property;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | declines in the financial condition of our tenants and our ability to collect rents from our tenants; and
| | - |  | ---------------------------------------------------------------------------------------------------------



| |  |  | decreases in the underlying value of our real estate.
| | - |  | -----------------------------------------------------

We are dependent upon the economic climates of our marketsBoston, Washington, DC, midtown Manhattan, San Francisco and Princeton, NJ.

Substantially all of our revenue is derived from properties located in five markets: Boston, Washington, DC, midtown Manhattan, San Francisco and Princeton, NJ. A downturn in the economies of these markets, or the
impact that a downturn in the overall national economy may have upon these economies, could result in reduced demand for office space. Because our portfolio consists primarily of office buildings (as compared to a more diversified real estate
portfolio), a decrease in demand for office space in turn could adversely affect our results of operations. Additionally, there are submarkets within our markets that are dependent upon a limited number of industries. For example, in our Washington,
DC market we focus on leasing office properties to governmental agencies and contractors, as well as legal firms. In our midtown Manhattan market we have historically leased properties to financial, legal and other professional firms. A significant
downturn in one or more of these sectors could adversely affect our results of operations.

Our investment in property development may be more costly
than anticipated.

We intend to continue to develop and substantially renovate office properties. Our current and future development
and construction activities may be exposed to the following risks:



| |  |  | we may be unable to proceed with the development of properties because we cannot obtain financing on favorable terms or at all;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------



| |  |  | we may incur construction costs for a development project which exceed our original estimates due to increases in interest rates and increased materials, labor,
leasing or other costs, which could make completion of the project less profitable because market rents may not increase sufficiently to compensate for the increase in construction costs;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | we may be unable to obtain, or face delays in obtaining, required zoning, land-use, building, occupancy, and other governmental permits and authorizations, which
could result in increased costs and could require us to abandon our activities entirely with respect to a project;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | we may abandon development opportunities after we begin to explore them and as a result we may lose deposits or fail to recover expenses already incurred;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | we may expend funds on and devote managements time to projects which we do not complete;
| | - |  | -----------------------------------------------------------------------------------------



| |  |  | we may be unable to complete construction and/or leasing of a property on schedule; and
| | - |  | ---------------------------------------------------------------------------------------



| |  |  | we may suspend development projects after construction has begun due to changes in economic conditions or other factors, and this may result in the write-off of
costs or increases in overall costs when the development project is restarted.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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Investment returns from our developed properties may be lower than anticipated.

Our developed properties may be exposed to the following risks:



| |  |  | we may lease developed properties at rental rates that are less than the rates projected at the time we decide to undertake the development; and
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | occupancy rates and rents at newly developed properties may fluctuate depending on a number of factors, including market and economic conditions, and may result in
our investments being less profitable than we expected or not profitable at all.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

We face risks associated with the development of
mixed-use commercial properties.

We may develop properties, either alone or through joint ventures with other persons, that are
known as mixed-use developments. This means that in addition to the development of office space, the project may also include space for other commercial purposes. We have limited experience in developing and managing non-office and
non-retail real estate. As a result, if a development project includes a non-office or non-retail use, we may seek to sell the rights to that component to a third-party developer with experience in that use or we may seek to partner with such a
developer. If we are not able to sell the rights or partner with such a developer, or if we choose to develop the other component ourselves, we would be exposed not only to those risks typically associated with the development of commercial real
estate generally, but also to specific risks associated with the development and ownership of non-office and non-retail real estate. In addition, even if we sell the rights to develop the other component or elect to participate in the development
through a joint venture, we may be exposed to the risks associated with the failure of the other party to complete the development as expected. These include the risk that the other party would default on its obligations necessitating that we
complete the other component ourselves (including providing any necessary financing).

We face risks associated with the use of debt to fund
acquisitions and developments, including refinancing risk.

We are subject to the risks normally associated with debt financing,
including the risk that our cash flow will be insufficient to meet required payments of principal and interest. We anticipate that only a small portion of the principal of our debt will be repaid prior to maturity. Therefore, we are likely to need
to refinance at least a portion of our outstanding debt as it matures. There is a risk that we may not be able to refinance existing debt or that the terms of any refinancing will not be as favorable as the terms of our existing debt. If principal
payments due at maturity cannot be refinanced, extended or repaid with proceeds from other sources, such as new equity capital, our cash flow may not be sufficient to repay all maturing debt in years when significant balloon payments
come due. In addition, we may rely on debt to fund a portion of our new investments such as our acquisition and development activity. There is a risk that we may be unable to finance these activities on favorable terms or at all. This risk is
currently heightened because the debt market is experiencing volatility, including reduced liquidity and increased credit risk premiums. These conditions, which increase the cost and reduce the availability of debt, may continue or worsen in
the future.

We have agreements with a number of our limited partners who contributed properties in exchange for partnership interests that
require us to maintain for specified periods of time secured debt on certain of our assets and/or allocate partnership debt to such limited partners to enable them to continue to defer recognition of their taxable gain with respect to the
contributed property. These tax protection and debt allocation agreements may restrict our ability to repay or refinance debt.

Adverse economic and
geopolitical conditions and dislocations in the credit markets could have a material adverse effect on our results of operations, financial condition and ability to pay distributions to you.

Our business may be affected by market and economic challenges experienced by the U.S. economy or real estate industry as a whole or by the local economic
conditions in the markets in which our properties are located,



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including the current dislocations in the credit markets and general global economic recession. These current conditions, or similar conditions existing in
the future, may adversely affect our results of operations, financial condition and ability to pay distributions as a result of the following, among other potential consequences:



| |  |  | the financial condition of our tenants, many of which are financial, legal and other professional firms such as Lehman Brothers, which filed for bankruptcy
protection in the third quarter of 2008, and Heller Ehrman LLP, which filed for bankruptcy protection in the fourth quarter of 2008, may be adversely affected, which may result in tenant defaults under leases due to bankruptcy, lack of liquidity,
operational failures or for other reasons;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | significant job losses in the financial and professional services industries may occur, which may decrease demand for our office space, causing market rental rates
and property values to be negatively impacted;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to borrow on terms and conditions that we find acceptable, or at all, may be limited, which could reduce our ability to pursue acquisition and
development opportunities and refinance existing debt, reduce our returns from our acquisition and development activities and increase our future interest expense;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | reduced values of our properties may limit our ability to dispose of assets at attractive prices or to obtain debt financing secured by our properties and may
reduce the availability of unsecured loans;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the value and liquidity of our short-term investments and cash deposits could be reduced as a result of a deterioration of the financial condition of the
institutions that hold our cash deposits or the institutions or assets in which we have made short-term investments, the dislocation of the markets for our short-term investments, increased volatility in market rates for such investments or other
factors;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | one or more lenders under our line of credit could refuse to fund their financing commitment to us or could fail and we may not be able to replace the financing
commitment of any such lenders on favorable terms, or at all; and
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | one or more counterparties to our derivative financial instruments could default on their obligations to us, including the capped call transactions we entered into
in connection with our offering of our 3.625% exchangeable senior notes due 2014 and any interest hedging contracts we may enter into from time to time, or could fail, increasing the risk that we may not realize the benefits of these instruments.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

An increase in interest rates would increase our interest costs on variable rate debt and could adversely impact our ability to
refinance existing debt or sell assets.

As of February 23, 2009, we had approximately $396.9 million of indebtedness that
bears interest at variable rates, and we may incur more of such indebtedness in the future. If interest rates increase, then so will the interest costs on our unhedged variable rate debt, which could adversely affect our cash flow and our ability to
pay principal and interest on our debt and our ability to make distributions to our securityholders. Further, rising interest rates could limit our ability to refinance existing debt when it matures. From time to time, we enter into interest rate
swap agreements and other interest rate hedging contracts, including swaps, caps and floors. While these agreements are intended to lessen the impact of rising interest rates on us, they also expose us to the risk that the other
parties to the agreements will not perform, we could incur significant costs associated with the settlement of the agreements, the agreements will be unenforceable and the underlying transactions will fail to qualify as
highly-effective cash flow hedges under SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities, as amended (See Note 6 to the Consolidated Financial Statements). In addition, an increase in interest rates could
decrease the amount third-parties are willing to pay for our assets, thereby limiting our ability to change our portfolio promptly in response to changes in economic or other conditions.

Covenants in our debt agreements could adversely affect our financial condition.

The
mortgages on our properties contain customary covenants such as those that limit our ability, without the prior consent of the lender, to further mortgage the applicable property or to discontinue insurance coverage.



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Our unsecured credit facility, unsecured debt securities and certain secured loans contain customary restrictions, requirements and other limitations on our
ability to incur indebtedness, including total debt to asset ratios, secured debt to total asset ratios, debt service coverage ratios and minimum ratios of unencumbered assets to unsecured debt, which we must maintain. Our continued ability to
borrow under our credit facilities is subject to compliance with our financial and other covenants. In addition, our failure to comply with such covenants could cause a default under the applicable debt agreement, and we may then be required to
repay such debt with capital from other sources. Under those circumstances, other sources of capital may not be available to us, or be available only on unattractive terms. Additionally, in the future our ability to satisfy current or prospective
lenders insurance requirements may be adversely affected if lenders generally insist upon greater insurance coverage against acts of terrorism or losses resulting from earthquakes than is available to us in the marketplace or on commercially
reasonable terms.

We rely on debt financing, including borrowings under our unsecured credit facility, issuances of unsecured debt
securities and debt secured by individual properties, to finance our existing portfolio, our acquisition and development activities and for working capital. If we are unable to obtain debt financing from these or other sources, or to refinance
existing indebtedness upon maturity, our financial condition and results of operations would likely be adversely affected. If we breach covenants in our debt agreements, the lenders can declare a default and, if the debt is secured, can take
possession of the property securing the defaulted loan. In addition, our unsecured debt agreements contain specific cross-default provisions with respect to specified other indebtedness, giving the unsecured lenders the right to declare a default if
we are in default under other loans in some circumstances. Defaults under our debt agreements could materially and adversely affect our financial condition and results of operations.

Our degree of leverage could limit our ability to obtain additional financing or affect the market price of Boston Properties, Inc.s common stock or our debt securities.

On February 23, 2009, our total consolidated debt was approximately $6.3 billion (i.e., excluding unconsolidated joint venture debt). Consolidated
debt to consolidated market capitalization ratio, which measures total consolidated debt as a percentage of the aggregate of total consolidated debt plus the market value of outstanding equity securities, is often used by analysts to gauge leverage
for equity REITs such as Boston Properties, Inc. Our market value is calculated using the price per share of Boston Properties, Inc.s common stock. Using the closing stock price of $35.73 per share of the common stock of Boston Properties,
Inc. on February 23, 2009, multiplied by the sum of (1) 141,155,937 outstanding common units of limited partnership (including 121,265,984 common units held by Boston Properties, Inc.), (2) an aggregate of 1,460,688 common units
issuable upon conversion of all outstanding Series Two Preferred Units of partnership interest, and (3) an aggregate of 1,453,002 common units issuable upon conversion of all outstanding LTIP Units, assuming all conditions have been met for the
conversion of the LTIP Units, our consolidated debt to total consolidated market capitalization ratio was approximately 55.1% as of February 23, 2009. The calculation of total consolidated market capitalization does not include 2008 OPP Awards
because, unlike other LTIP Units, they are not earned until certain return thresholds are achieved.

Our degree of leverage could affect
our ability to obtain additional financing for working capital, capital expenditures, acquisitions, development or other general corporate purposes. Our senior unsecured debt is currently rated investment grade by the three major rating agencies.
However, there can be no assurance that we will be able to maintain this rating, and in the event our senior debt is downgraded from its current rating, we would likely incur higher borrowing costs and/or difficulty in obtaining additional
financing. Our degree of leverage could also make us more vulnerable to a downturn in business or the economy generally. There is a risk that changes in our debt to market capitalization ratio, which is in part a function of the stock price of
Boston Properties, Inc., or our ratio of indebtedness to other measures of asset value used by financial analysts may have an adverse effect on the value of our securities.



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We face risks associated with property acquisitions.

We have acquired in the past and intend to continue to pursue the acquisition of properties and portfolios of properties, including large portfolios that
could increase our size and result in alterations to our capital structure. Our acquisition activities and their success are subject to the following risks:



| |  |  | even if we enter into an acquisition agreement for a property, we may be unable to complete that acquisition after making a non-refundable deposit and incurring
certain other acquisition-related costs;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | we may be unable to obtain financing for acquisitions on favorable terms or at all;
| | - |  | -----------------------------------------------------------------------------------



| |  |  | acquired properties may fail to perform as expected;
| | - |  | ----------------------------------------------------



| |  |  | the actual costs of repositioning or redeveloping acquired properties may be greater than our estimates;
| | - |  | --------------------------------------------------------------------------------------------------------



| |  |  | the acquisition agreement will likely contain conditions to closing, including completion of due diligence investigations to our satisfaction or other conditions
that are not within our control, which may not be satisfied;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | acquired properties may be located in new markets where we may face risks associated with a lack of market knowledge or understanding of the local economy, lack of
business relationships in the area and unfamiliarity with local governmental and permitting procedures; and
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | we may be unable to quickly and efficiently integrate new acquisitions, particularly acquisitions of portfolios of properties, into our existing operations, and
this could have an adverse effect on our results of operations and financial condition.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

We have acquired in the past and
in the future may acquire properties or portfolios of properties through tax deferred contribution transactions in exchange for our partnership interests. This acquisition structure has the effect, among others, of reducing the amount of tax
depreciation we can deduct over the tax life of the acquired properties, and typically requires that we agree to protect the contributors ability to defer recognition of taxable gain through restrictions on our ability to dispose of the
acquired properties and/or the allocation of partnership debt to the contributors to maintain their tax bases. These restrictions could limit our ability to sell an asset at a time, or on terms, that would be favorable absent such restrictions.

Acquired properties may expose us to unknown liability.

We may acquire properties subject to liabilities and without any recourse, or with only limited recourse, against the prior owners or other third parties with respect to unknown liabilities. As a result, if a
liability were asserted against us based upon ownership of those properties, we might have to pay substantial sums to settle or contest it, which could adversely affect our results of operations and cash flow. Unknown liabilities with respect to
acquired properties might include:



| |  |  | liabilities for clean-up of undisclosed environmental contamination;
| | - |  | --------------------------------------------------------------------



| |  |  | claims by tenants, vendors or other persons against the former owners of the properties;
| | - |  | ----------------------------------------------------------------------------------------



| |  |  | liabilities incurred in the ordinary course of business; and
| | - |  | ------------------------------------------------------------



| |  |  | claims for indemnification by general partners, directors, officers and others indemnified by the former owners of the properties.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------

Competition for acquisitions may result in increased prices for properties.

We plan to continue to acquire properties as we are presented with attractive opportunities. We may face competition for acquisition opportunities with other investors, and this competition may adversely affect us by
subjecting us to the following risks:



| |  |  | we may be unable to acquire a desired property because of competition from other well-capitalized real estate investors, including publicly traded and private
REITs, institutional investment funds and other real estate investors; and
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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| |  |  | even if we are able to acquire a desired property, competition from other real estate investors may significantly increase the purchase price.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------

Our use of joint ventures may limit our flexibility with jointly owned investments.

In appropriate circumstances, we intend to develop and acquire properties in joint ventures with other persons or entities when circumstances warrant the
use of these structures. We currently have twelve joint ventures that are not consolidated with our financial statements. Our share of the aggregate revenue of these joint ventures represented approximately 11.6% of our total revenue (the sum of our
total consolidated revenue and our share of such joint venture revenue) for the year ended December 31, 2008. Our participation in joint ventures is subject to the risks that:



| |  |  | we could become engaged in a dispute with any of our joint venture partners that might affect our ability to develop or operate a property;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our joint ventures are subject to debt and in the current volatile credit market the refinancing of such debt may require equity capital calls;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our joint venture partners may default on their obligations necessitating that we fulfill their obligation ourselves;
| | - |  | ---------------------------------------------------------------------------------------------------------------------



| |  |  | our joint venture partners may have different objectives than we have regarding the appropriate timing and terms of any sale or refinancing of properties; and
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our joint venture partners may have competing interests in our markets that could create conflict of interest issues.
| | - |  | ---------------------------------------------------------------------------------------------------------------------

Our properties face significant competition.

We face significant competition from developers, owners and operators of office properties and other commercial real estate, including sublease space available from our tenants. Substantially all of our properties face competition from
similar properties in the same market. This competition may affect our ability to attract and retain tenants and may reduce the rents we are able to charge. These competing properties may have vacancy rates higher than our properties, which may
result in their owners being willing to lease available space at lower rates than the space in our properties.

We face potential difficulties or
delays renewing leases or re-leasing space.

We derive most of our income from rent received from our tenants. If a tenant
experiences a downturn in its business or other types of financial distress, it may be unable to make timely rental payments. Also, when our tenants decide not to renew their leases or terminate early, we may not be able to re-let the space. Even if
tenants decide to renew or lease new space, the terms of renewals or new leases, including the cost of required renovations or concessions to tenants, may be less favorable to us than current lease terms. As a result, our cash flow could decrease
and our ability to make distributions to our securityholders could be adversely affected.

We face potential adverse effects from major tenants
bankruptcies or insolvencies.

The bankruptcy or insolvency of a major tenant may adversely affect the income produced by our
properties. Our tenants could file for bankruptcy protection or become insolvent in the future. We cannot evict a tenant solely because of its bankruptcy. On the other hand, a bankrupt tenant may reject and terminate its lease with us. In such case,
our claim against the bankrupt tenant for unpaid and future rent would be subject to a statutory cap that might be substantially less than the remaining rent actually owed under the lease, and, even so, our claim for unpaid rent would likely not be
paid in full. This shortfall could adversely affect our cash flow and results of operations.



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We may have difficulty selling our properties, which may limit our flexibility.

Large and high-quality office and hotel properties like the ones that we own could be difficult to sell. This may limit our ability to change our
portfolio promptly in response to changes in economic or other conditions. In addition, federal tax laws limit our ability to sell properties and this may affect our ability to sell properties without adversely affecting returns to our
securityholders. These restrictions reduce our ability to respond to changes in the performance of our investments and could adversely affect our financial condition and results of operations.

Our ability to dispose of some of our properties is constrained by their tax attributes. Properties which we developed and have owned for a significant
period of time or which we acquired through tax deferred contribution transactions in exchange for our partnership interests often have low tax bases. If we dispose of these properties outright in taxable transactions, we may be required to
distribute a significant amount of the taxable gain to our securityholders and to stockholders of Boston Properties, Inc. under the requirements of the Internal Revenue Code for REITs, which in turn would impact our cash flow and increase our
leverage. In some

cases, without incurring additional costs we may be restricted from disposing of properties contributed in exchange for our partnership
interests under tax protection agreements with contributors. To dispose of low basis or tax-protected properties efficiently we from time to time use like-kind exchanges, which qualify for non-recognition of taxable gain, but can be difficult to
consummate and result in the property for which the disposed assets are exchanged inheriting their low tax bases and other tax attributes (including tax protection covenants).

Because we own a hotel property, we face the risks associated with the hospitality industry.

Because the lease payments we receive under our hotel lease are based on a participation in the gross receipts of the hotel, if the hotel does not generate sufficient receipts, our cash flow would be decreased, which could reduce the amount
of cash available for distribution to our securityholders. The following factors, among others, are common to the hotel industry, and may reduce the receipts generated by our hotel property:



| |  |  | our hotel property competes for guests with other hotels, a number of which have greater marketing and financial resources than our hotel-operating business
partners;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | if there is an increase in operating costs resulting from inflation and other factors, our hotel-operating business partners may not be able to offset such increase
by increasing room rates;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our hotel property is subject to the fluctuating and seasonal demands of business travelers and tourism; and
| | - |  | ------------------------------------------------------------------------------------------------------------



| |  |  | our hotel property is subject to general and local economic and social conditions that may affect demand for travel in general, including war and terrorism.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------

In addition, because our hotel property is located in Cambridge, Massachusetts, it is subject to the Cambridge
markets fluctuations in demand, increases in operating costs and increased competition from additions in supply.

We face risks associated with
short-term liquid investments.

We continue to have significant cash balances that we invest in a variety of short-term investments
that are intended to preserve principal value and maintain a high degree of liquidity while providing current income. From time to time, these investments may include (either directly or indirectly):



| |  |  | direct obligations issued by the U.S. Treasury;
| | - |  | -----------------------------------------------



| |  |  | obligations issued or guaranteed by the U.S. government or its agencies;
| | - |  | ------------------------------------------------------------------------



| |  |  | taxable municipal securities;
| | - |  | -----------------------------



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| |  |  | obligations (including certificates of deposit) of banks and thrifts;
| | - |  | ---------------------------------------------------------------------



| |  |  | commercial paper and other instruments consisting of short-term U.S. dollar denominated obligations issued by corporations and banks;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------



| |  |  | repurchase agreements collateralized by corporate and asset-backed obligations;
| | - |  | -------------------------------------------------------------------------------



| |  |  | both registered and unregistered money market funds; and
| | - |  | --------------------------------------------------------



| |  |  | other highly rated short-term securities.
| | - |  | -----------------------------------------

Investments in these securities and funds are not insured against loss of principal. Under certain circumstances we may be required to redeem all or part of our investment, and our right to redeem some or all of our investment may be
delayed or suspended. In addition, there is no guarantee that our investments in these securities or funds will be redeemable at par value. A decline in the value of our investment or a delay or suspension of our right to redeem may have a material
adverse effect on our results of operations or financial condition.

Failure of Boston Properties, Inc. to qualify as a REIT would have a material
adverse effect on BPLP.

We, in general, and the holders of our securities, in particular, must rely on Boston Properties, Inc., as
our general partner, to manage our affairs and business. Boston Properties, Inc. is subject to certain risks that may affect its financial and other conditions, including particularly adverse consequences if it fails to qualify as a REIT for federal
income tax purposes. While Boston Properties, Inc. intends to operate in a manner that will allow it to continue to qualify as a REIT, we cannot assure you that it will remain qualified as such in the future. This is because qualification as a REIT
involves the application of highly technical and complex provisions of the Internal Revenue Code as to which there are only limited judicial and administrative interpretations, and involves the determination of facts and circumstances not entirely
within our control. In addition, future legislation, new regulations, administrative interpretations or court decisions may significantly change the tax laws or the application of the tax laws with respect to qualification as a REIT for federal
income tax purposes or the federal income tax consequences of such qualification. If Boston Properties, Inc. fails to qualify as a REIT, it will face serious tax consequences which will directly and adversely impact us and may substantially reduce
the funds available for payment of distributions to our securityholders, and it will be barred from qualifying as a REIT for the four years following such failure.

In order to enable our general partner, Boston Properties, Inc., to maintain its REIT status, we may be forced to borrow funds during unfavorable market conditions.

In order to enable our general partner, Boston Properties, Inc., to maintain its REIT status, we may need to borrow funds on a short-term basis to meet
the REIT distribution requirements, even if the then-prevailing market conditions are not favorable for these borrowings. To qualify as a REIT, Boston Properties, Inc. generally must distribute to its stockholders at least 90% of its net taxable
income each year, excluding capital gains. In addition, Boston Properties, Inc. will be subject to a 4% nondeductible excise tax on the amount, if any, by which dividends paid by it in any calendar year are less than the sum of 85% of its ordinary
income, 95% of its capital gain net income and 100% of its undistributed income from prior years. Boston Properties, Inc. may need short-term debt or long-term debt or proceeds from asset sales, creation of joint ventures or sales of common stock to
fund required distributions as a result of differences in timing between the actual receipt of income and the recognition of income for federal income tax purposes, or the effect of non-deductible capital expenditures, the creation of reserves or
required debt or amortization payments. The inability of our cash flows to cover these distribution requirements could have an adverse impact on our ability to raise short- and long-term debt or sell equity securities in order to fund distributions
required to maintain Boston Properties, Inc.s REIT status.



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Congress has introduced legislation that, if enacted, could cause Boston Properties Limited Partnership to be
taxable as a corporation for U.S. federal income tax purposes under the publicly traded partnership rules.

Legislation was recently
introduced in Congress that would treat publicly traded partnerships as corporations for federal income tax purposes if the partnership directly or indirectly derives income from certain investment adviser or asset management services. Because
certain of our current activities could constitute investment adviser or asset management services as defined for these purposes, unless transfers of ownership of interests are limited in a manner that complies with certain regulatory safe harbors
or another exception applies, it is possible that this legislation, if enacted, could cause us to be taxable as a corporation. Classification as a corporation would also cause Boston Properties, Inc. to fail to qualify as a REIT. Under a
transitional rule contained in one version of the proposed legislation we would be exempt from the new rules until the taxable year beginning January 1, 2013. It is possible, however, that any legislation enacted may include a shorter
transition period, may be effective immediately, or possibly even retroactively.

Congress is also considering legislative proposals to
treat all or part of certain income allocated to a partner by a partnership in respect of certain services provided to or for the benefit of the partnership (carried interest revenue) as ordinary income for U.S. federal income tax
purposes. While the current legislative proposal provides that such income will nevertheless retain its original character for purposes of the REIT qualification tests, it is not clear what form any such final legislation would take. Furthermore,
under the proposed legislation, carried interest revenue could be treated as non-qualifying income for purposes of the qualifying income exception to the publicly-traded partnership rules. If enacted, this could result in us being
taxable as a corporation for U.S. federal income tax purposes if the amount of any such carried interest revenue plus any other non-qualifying income earned by BPLP exceeds 10% of our gross income in any taxable year.

Limits on changes in control of Boston Properties, Inc. may discourage takeover attempts beneficial to our securityholders.

Provisions in Boston Properties, Inc.s certificate of incorporation and bylaws, its shareholder rights agreement and provisions in our agreement of
limited partnership, as well as provisions of the Internal Revenue Code and Delaware corporate law, may:



| |  |  | delay or prevent a change of control over Boston Properties, Inc. or a tender offer, even if such action might be beneficial to our securityholders or the
securityholders of Boston Properties, Inc.; and
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | limit our securityholders opportunity or the opportunity of securityholders of Boston Properties, Inc. to receive a potential premium for their units or
shares of common stock over then-prevailing market prices.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Stock Ownership Limit

To facilitate the maintenance of Boston Properties, Inc.s qualification as a REIT and to otherwise address concerns relating to concentration of
capital stock ownership, its certificate of incorporation generally prohibits ownership, directly, indirectly or beneficially, by any single stockholder of more than 6.6% of the number of outstanding shares of any class or series of Boston
Properties, Inc.s common stock. We refer to this limitation as the ownership limit. The Board of Directors of Boston Properties, Inc. may waive, in its sole discretion, or modify the ownership limit with respect to one or more
persons if it is satisfied that ownership in excess of this limit will not jeopardize Boston Properties, Inc.s status as a REIT for federal income tax purposes. In addition, under Boston Properties, Inc.s certificate of incorporation
each of Mortimer B. Zuckerman and Edward H. Linde, along with their respective families and affiliates, as well as, in general, pension plans and mutual funds, may actually and beneficially own up to 15% of the number of outstanding shares of any
class or series of Boston Properties, Inc.s equity common stock. Shares of Boston Properties, Inc. owned in violation of the ownership limit will be subject to the loss of rights to distributions and voting and other penalties. The ownership
limit may have the effect of inhibiting or impeding a change in control of Boston Properties, Inc.



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Agreement of Limited Partnership of BPLP

We have agreed in our agreement of limited partnership agreement that Boston Properties, Inc. will not engage in specified extraordinary transactions,
including, among others, business combinations, unless limited partners other than Boston Properties, Inc. receive, or have the opportunity to receive, either (1) the same consideration for their partnership interests as holders of Boston
Properties, Inc.s common stock in the transaction or (2) limited partnership units that, among other things, would entitle the holders, upon redemption of these units, to receive shares of common equity of a publicly traded company or the
same consideration as holders of Boston Properties, Inc. common stock received in the transaction. If these limited partners would not receive such consideration, we cannot engage in the transaction unless limited partners holding at least 75% of
the common units of limited partnership interest, other than those held by Boston Properties, Inc. or its affiliates, consent to the transaction. In addition, we have agreed in our agreement of limited partnership that Boston Properties, Inc., as
our general partner, will not complete specified extraordinary transactions, including among others, business combinations, in which we receive the approval of its common stockholders unless (1) limited partners holding at least 75% of the
common units of limited partnership interest, other than those held by Boston Properties, Inc. or its affiliates, consent to the transaction or (2) our limited partners are also allowed to vote and the transaction would have been approved had
these limited partners been able to vote as common stockholders on the transaction. Therefore, if Boston Properties, Inc.s common stockholders approve a specified extraordinary transaction, the partnership agreement requires the following
before we can complete the transaction:



| |  |  | our securityholders must vote on the matter;
| | - |  | --------------------------------------------



| |  |  | Boston Properties, Inc. must vote its partnership interests in the same proportion as its stockholders voted on the transaction; and
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the result of the vote of our securityholders must be such that had such vote been a vote of stockholders, the business combination would have been approved.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------

With respect to specified extraordinary transactions, Boston Properties, Inc., as our general partner, has agreed in our
partnership agreement to use its commercially reasonable efforts to structure such a transaction to avoid causing our limited partners to recognize gain for federal income tax purposes by virtue of the occurrence of or their participation in such a
transaction.

As a result of these provisions, a potential acquirer may be deterred from making an acquisition proposal, and Boston
Properties, Inc. may be prohibited by contract from engaging in a proposed extraordinary transaction, including a proposed business combination, even though its stockholders approve of the transaction.

Shareholder Rights Plan

Boston
Properties, Inc. has a shareholder rights plan. Under the terms of this plan, Boston Properties, Inc. can in effect prevent a person or group from acquiring more than 15% of the outstanding shares of its common stock because, unless it approves of
the acquisition, after the person acquires more than 15% of the outstanding common stock of Boston Properties, Inc., all other stockholders will have the right to purchase securities from Boston Properties, Inc. at a price that is less than their
then fair market value. This would substantially reduce the value and influence of the stock owned by the acquiring person. The Board of Directors of Boston Properties, Inc. can prevent the plan from operating by approving the transaction in
advance, which gives Boston Properties, Inc. significant power to approve or disapprove of the efforts of a person or group to acquire a large interest in Boston Properties, Inc.

We may change our policies without obtaining the approval of our securityholders.

Our
operating and financial policies, including our policies with respect to acquisitions of real estate, growth, operations, indebtedness, capitalization and distributions, are exclusively determined by our sole general partner, Boston Properties,
Inc., acting through its Board of Directors. Accordingly, our securityholders do not control these policies.



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Our success depends on key personnel whose continued service is not guaranteed.

We depend on the efforts of key personnel, particularly Mortimer B. Zuckerman, Chairman of the Board of Directors of Boston Properties, Inc., Edward H.
Linde, the Chief Executive Officer of Boston Properties, Inc., and Douglas T. Linde, the President of Boston Properties, Inc. Among the reasons that Messrs. Zuckerman, E. Linde and D. Linde are important to our success is that each has a national
reputation, which attracts business and investment opportunities and assists us in negotiations with lenders. If we lost their services, our relationships with lenders, potential tenants and industry personnel could diminish. Mr. Zuckerman has
substantial outside business interests that could interfere with his ability to devote his full time to our business and affairs.

The two
Executive Vice Presidents and five Regional Managers of Boston Properties, Inc. also have strong reputations. Their reputations aid us in identifying opportunities, having opportunities brought to us, and negotiating with tenants and build-to-suit
prospects. While we believe that we could find replacements for these key personnel, the loss of their services could materially and adversely affect our operations because of diminished relationships with lenders, prospective tenants and industry
personnel.

Conflicts of interest exist with holders of our limited partnership interests.

Sales of properties and repayment of related indebtedness will have different effects on certain of our securityholders.

Some holders of our limited partnership interests, including Messrs. Zuckerman and E. Linde, would incur adverse tax consequences upon the sale of certain
of our properties and on the repayment of related debt which differ from the tax consequences to us. Consequently, such holders of our limited partnership interests may have different objectives regarding the appropriate pricing and timing of any
such sale or repayment of debt. While Boston Properties, Inc. has exclusive authority under our limited partnership agreement to determine when to refinance or repay debt or whether, when, and on what terms to sell a property, subject, in the case
of certain properties, to the contractual commitments described below, any such decision would require the approval of the Board of Directors of Boston Properties, Inc. While the Board of Directors of Boston Properties, Inc. has a policy with
respect to these matters, as directors and executive officers of Boston Properties, Inc., Messrs. Zuckerman and Linde could exercise their influence in a manner inconsistent with the interests of some of our stockholders, including in a manner which
could prevent completion of a sale of a property or the repayment of indebtedness.

Agreement not to sell some properties.

We have entered into tax protection agreements with respect to some properties that we have acquired in exchange for partnership interests in BPLP.
Pursuant to those agreements, we have agreed not to sell or otherwise transfer some of our properties, prior to specified dates, in any transaction that would trigger taxable income and we are responsible for the reimbursement of certain tax-related
costs to the prior owners if the subject properties are sold in a taxable sale. In general, our obligations to the prior owners are limited in time and only apply to actual damages suffered. As of December 31, 2008 there were a total of 6
properties subject to these restrictions, and those properties are estimated to have accounted for approximately 29% of our total revenue for the year ended December 31, 2008.

We have also entered into agreements providing prior owners of properties with the right to guarantee specific amounts of indebtedness and, in the event
that the specific indebtedness they guarantee is repaid or reduced, additional and/or substitute indebtedness. These agreements may hinder actions that we may otherwise desire to take to repay or refinance guaranteed indebtedness because we would be
required to make payments to the beneficiaries of such agreements if we violate these agreements.

Messrs. Zuckerman and E. Linde will
continue to engage in other activities.

Messrs. Zuckerman and E. Linde have a broad and varied range of investment interests. Either
one could acquire an interest in a company which is not currently involved in real estate investment activities but which



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may acquire real property in the future. However, pursuant to each of their employment agreements, Messrs. Zuckerman and E. Linde will not, in general, have
management control over such companies and, therefore, they may not be able to prevent one or more of such companies from engaging in activities that are in competition with our activities.

Compliance or failure to comply with the Americans with Disabilities Act or other safety regulations and requirements could result in substantial costs.

The Americans with Disabilities Act generally requires that public buildings, including office buildings and hotels, be made accessible to
disabled persons. Noncompliance could result in the imposition of fines by the federal government or the award of damages to private litigants. If, under the Americans with Disabilities Act, we are required to make substantial alterations and
capital expenditures in one or more of our properties, including the removal of access barriers, it could adversely affect our financial condition and results of operations, as well as the amount of cash available for distribution to our
securityholders.

Our properties are subject to various federal, state and local regulatory requirements, such as state and local fire and
life safety requirements. If we fail to comply with these requirements, we could incur fines or private damage awards. We do not know whether existing requirements will change or whether compliance with future requirements will require significant
unanticipated expenditures that will affect our cash flow and results of operations.

Some potential losses are not covered by insurance.

We carry insurance coverage on our properties of types and in amounts and with deductibles that we believe are in line with coverage
customarily obtained by owners of similar properties. In response to the uncertainty in the insurance market following the terrorist attacks of September 11, 2001, the Federal Terrorism Risk Insurance Act (as amended, TRIA) was
enacted in November 2002 to require regulated insurers to make available coverage for certified acts of terrorism (as defined by the statute). The expiration date of TRIA was extended to December 31, 2014 by the Terrorism Risk
Insurance Program Reauthorization Act of 2007 (TRIPRA). Currently, the per occurrence limits of our portfolio property insurance program are $1.0 billion, including coverage for acts of terrorism certified under TRIA. We currently insure
certain properties, including the General Motors Building located at 767 Fifth Avenue in New York, New York (767 Fifth Avenue), in a separate stand alone insurance program. The property insurance program per occurrence limits for 767
Fifth Avenue are $1.625 billion, including coverage for acts of terrorism certified under TRIA, with $1.375 billion of coverage for losses in excess of $250 million being provided by NYXP, LLC, as a direct insurer. We also currently carry nuclear,
biological, chemical and radiological terrorism insurance coverage (NBCR Coverage) for acts of terrorism certified under TRIA, which is provided by IXP, LLC as a direct insurer, for the properties in our portfolio, including 767 Fifth
Avenue, but excluding the properties owned by our Value-Added Fund and certain other properties owned in joint ventures with third parties or which we manage. The per occurrence limit for NBCR Coverage is $1 billion. Under TRIA, after the payment of
the required deductible and coinsurance, the NBCR Coverage is backstopped by the Federal Government if the aggregate industry insured losses resulting from a certified act of terrorism exceed a program trigger. The program trigger is
$100 million and the coinsurance is 15%. Under TRIPRA, if the Federal Government pays out for a loss under TRIA, it is mandatory that the Federal Government recoup the full amount of the loss from insurers offering TRIA coverage after the
payment of the loss pursuant to a formula in TRIPRA. We may elect to terminate the NBCR Coverage if the Federal Government seeks recoupment for losses paid under TRIA, if there is a change in our portfolio or for any other reason. We intend to
continue to monitor the scope, nature and cost of available terrorism insurance and maintain insurance in amounts and on terms that are commercially reasonable.

We also currently carry earthquake insurance on our properties located in areas known to be subject to earthquakes in an amount and subject to self-insurance that we believe are commercially reasonable. In addition,
this insurance is subject to a deductible in the amount of 5% of the value of the affected property. Specifically,



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we currently carry earthquake insurance which covers our San Francisco region with a $120 million per occurrence limit and a $120 million annual aggregate
limit, $20 million of which is provided by IXP LLC, as a direct insurer. The amount of our earthquake insurance coverage may not be sufficient to cover losses from earthquakes. In addition, the amount of earthquake coverage could impact our ability
to finance properties subject to earthquake risk. We may discontinue earthquake insurance on some or all of our properties in the future if the premiums exceed our estimation of the value of the coverage.

IXP LLC (IXP), a captive insurance company which is a wholly-owned subsidiary, acts as a direct insurer with respect to a portion of our
earthquake insurance coverage for our Greater San Francisco properties and our NBCR Coverage for acts of terrorism certified under TRIA. NYXP, LLC (NYXP), a captive insurance company which is a wholly-owned subsidiary, acts as a direct
insurer with respect to a portion of our coverage for acts of terrorism certified under TRIA for 767 Fifth Avenue. Currently, NYXP only insures losses which exceed the program trigger under TRIA and NYXP reinsures with a third-party insurance
company any coinsurance payable under TRIA. Insofar as we own IXP and NYXP, we are responsible for their liquidity and capital resources, and the accounts of IXP and NYXP are part of our consolidated financial statements. In particular, if a loss
occurs which is covered by our NBCR Coverage but is less than the applicable program trigger under TRIA, IXP would be responsible for the full amount of the loss without any backstop by the Federal Government. IXP and NYXP would also be responsible
for any recoupment charges by the Federal Government in the event losses are paid out and their insurance policies are maintained after the payout by the Federal Government. If we experience a loss and IXP or NYXP are required to pay under their
insurance policies, we would ultimately record the loss to the extent of the required payment. Therefore, insurance coverage provided by IXP and NYXP should not be considered as the equivalent of third-party insurance, but rather as a modified form
of self-insurance.

The mortgages on our properties typically contain requirements concerning the financial ratings of the insurers who
provide policies covering the property. We provide the lenders on a regular basis with the identity of the insurance companies in our insurance programs. The ratings of some of our insurers are below the rating requirements in some of our loan
agreements and the lenders for these loans could attempt to claim an event of default has occurred under the loan. We believe we could obtain insurance with insurers which satisfy the rating requirements. Additionally, in the future our ability to
obtain debt financing secured by individual properties, or the terms of such financing, may be adversely affected if lenders generally insist on ratings for insurers which are difficult to obtain or which result in a commercially unreasonable
premium. There can be no assurance that a deficiency in the financial ratings of one or more of our insurers will not have a material adverse effect on us.

We continue to monitor the state of the insurance market in general, and the scope and costs of coverage for acts of terrorism and California earthquake risk in particular, but we cannot anticipate what coverage will
be available on commercially reasonable terms in future policy years. There are other types of losses, such as from wars or the presence of mold at our properties, for which we cannot obtain insurance at all or at a reasonable cost. With respect to
such losses and losses from acts of terrorism, earthquakes or other catastrophic events, if we experience a loss that is uninsured or that exceeds policy limits, we could lose the capital invested in the damaged properties, as well as the
anticipated future revenues from those properties. Depending on the specific circumstances of each affected property, it is possible that we could be liable for mortgage indebtedness or other obligations related to the property. Any such loss could
materially and adversely affect our business and financial condition and results of operations.

Actual or threatened terrorist attacks may adversely
affect our ability to generate revenues and the value of our properties.

We have significant investments in large metropolitan
markets that have been or may be in the future the targets of actual or threatened terrorism attacks, including midtown Manhattan, Washington, DC, Boston and San Francisco. As a result, some tenants in these markets may choose to relocate their
businesses to other markets or to lower-profile office buildings within these markets that may be perceived to be less likely targets of future terrorist activity. This could result in an overall decrease in the demand for office space in these
markets



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generally or in our properties in particular, which could increase vacancies in our properties or necessitate that we lease our properties on less favorable
terms or both. In addition, future terrorist attacks in these markets could directly or indirectly damage our properties, both physically and financially, or cause losses that materially exceed our insurance coverage. As a result of the foregoing,
our ability to generate revenues and the value of our properties could decline materially. See also Some potential losses are not covered by insurance.

We face risks associated with our tenants being designated Prohibited Persons by the Office of Foreign Assets Control.

Pursuant to Executive Order 13224 and other laws, the Office of Foreign Assets Control of the United States Department of the Treasury (OFAC)
maintains a list of persons designated as terrorists or who are otherwise blocked or banned (Prohibited Persons). OFAC regulations and other laws prohibit conducting business or engaging in transactions with Prohibited Persons (the
OFAC Requirements). Certain of our loan and other agreements require us to comply with OFAC Requirements. We have established a compliance program whereby tenants and others with whom we conduct business are checked against the OFAC list
of Prohibited Persons prior to entering into any agreement and on a periodic basis thereafter. Our leases and other agreements require the other party to comply with OFAC Requirements. If a tenant or other party with whom we contract is placed on
the OFAC list we may be required by the OFAC Requirements to terminate the lease or other agreement. Any such termination could result in a loss of revenue or a damage claim by the other party that the termination was wrongful.

Potential liability for environmental contamination could result in substantial costs.

Under federal, state and local environmental laws, ordinances and regulations, we may be required to investigate and clean up the effects of releases of
hazardous or toxic substances or petroleum products at our properties simply because of our current or past ownership or operation of the real estate. If unidentified environmental problems arise, we may have to make substantial payments, which
could adversely affect our cash flow and our ability to make distributions to our securityholders, because:



| |  |  | as owner or operator we may have to pay for property damage and for investigation and clean-up costs incurred in connection with the contamination;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the law typically imposes clean-up responsibility and liability regardless of whether the owner or operator knew of or caused the contamination;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | even if more than one person may be responsible for the contamination, each person who shares legal liability under the environmental laws may be held responsible
for all of the clean-up costs; and
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | governmental entities and third parties may sue the owner or operator of a contaminated site for damages and costs.
| | - |  | -------------------------------------------------------------------------------------------------------------------

These costs could be substantial and in extreme cases could exceed the amount of our insurance or the value of the contaminated property. We currently
carry environmental insurance in an amount and subject to deductibles that we believe are commercially reasonable. Specifically, we carry a pollution legal liability policy with a $10 million limit per incident and a policy aggregate limit of $30
million. The presence of hazardous or toxic substances or petroleum products or the failure to properly remediate contamination may materially and adversely affect our ability to borrow against, sell or rent an affected property. In addition,
applicable environmental laws create liens on contaminated sites in favor of the government for damages and costs it incurs in connection with a contamination. Changes in laws increasing the potential liability for environmental conditions existing
at our properties, or increasing the restrictions on the handling, storage or discharge of hazardous or toxic substances or petroleum products or other actions may result in significant unanticipated expenditures.



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Environmental laws also govern the presence, maintenance and removal of asbestos. Such laws require that
owners or operators of buildings containing asbestos:



| |  |  | properly manage and maintain the asbestos;
| | - |  | ------------------------------------------



| |  |  | notify and train those who may come into contact with asbestos; and
| | - |  | -------------------------------------------------------------------



| |  |  | undertake special precautions, including removal or other abatement, if asbestos would be disturbed during renovation or demolition of a building.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------

Such laws may impose fines and penalties on building owners or operators who fail to comply with these requirements and
may allow third parties to seek recovery from owners or operators for personal injury associated with exposure to asbestos fibers.

Some of
our properties are located in urban and previously developed areas where fill or current or historic industrial uses of the areas have caused site contamination. It is our policy to retain independent environmental consultants to conduct Phase I
environmental site assessments and asbestos surveys with respect to our acquisition of properties. These assessments generally include a visual inspection of the properties and the surrounding areas, an examination of current and historical uses of
the properties and the surrounding areas and a review of relevant state, federal and historical documents, but do not involve invasive techniques such as soil and ground water sampling. Where appropriate, on a property-by-property basis, our
practice is to have these consultants conduct additional testing, including sampling for asbestos, for lead in drinking water, for soil contamination where underground storage tanks are or were located or where other past site usage creates a
potential environmental problem, and for contamination in groundwater. Even though these environmental assessments are conducted, there is still the risk that:



| |  |  | the environmental assessments and updates did not identify all potential environmental liabilities;
| | - |  | ---------------------------------------------------------------------------------------------------



| |  |  | a prior owner created a material environmental condition that is not known to us or the independent consultants preparing the assessments;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | new environmental liabilities have developed since the environmental assessments were conducted; and
| | - |  | ----------------------------------------------------------------------------------------------------



| |  |  | future uses or conditions such as changes in applicable environmental laws and regulations could result in environmental liability for us.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------

Inquiries about indoor air quality may necessitate special investigation and, depending on the results, remediation
beyond our regular indoor air quality testing and maintenance programs. Indoor air quality issues can stem from inadequate ventilation, chemical contaminants from indoor or outdoor sources, and biological contaminants such as molds, pollen, viruses
and bacteria. Indoor exposure to chemical or biological contaminants above certain levels can be alleged to be connected to allergic reactions or other health effects and symptoms in susceptible individuals. If these conditions were to occur at one
of our properties, we may need to undertake a targeted remediation program, including without limitation, steps to increase indoor ventilation rates and eliminate sources of contaminants. Such remediation programs could be costly, necessitate the
temporary relocation of some or all of the propertys tenants or require rehabilitation of the affected property.

We did not obtain new
owners title insurance policies in connection with properties acquired during Boston Properties, Inc.s initial public offering.

We acquired many of our properties from our predecessors at the completion of Boston Properties, Inc.s initial public offering in June 1997. Before we acquired these properties, each of them was insured by a title insurance policy. We
did not obtain new owners title insurance policies in connection with the acquisition of these properties. However, to the extent we have financed properties after acquiring them in connection with the initial public offering, we have obtained
new title insurance policies, however, the amount of these policies may be less than the current or future value of the applicable properties. Nevertheless, because in many instances we acquired these properties indirectly by acquiring ownership of
the entity that owned the property and those



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owners remain in existence as our subsidiaries, some of these title insurance policies may continue to benefit us. Many of these title insurance policies may
be for amounts less than the current or future values of the applicable properties. If there was a title defect related to any of these properties, or to any of the properties acquired at the time of the initial public offering of Boston Properties,
Inc., that is no longer covered by a title insurance policy, we could lose both our capital invested in and our anticipated profits from such property. We have obtained title insurance policies for all properties that we have acquired after the
initial public offering of Boston Properties, Inc., however, these policies may be for amounts less than the current or future values of the applicable properties.

Because of the ownership structure of our hotel property, we face potential adverse effects from changes to the applicable tax laws.

We own one hotel property. However, under the Internal Revenue Code, REITs like Boston Properties, Inc. are not allowed to operate hotels directly or indirectly. Accordingly, we lease our hotel property to one of our
taxable REIT subsidiaries. As lessor, we are entitled to a percentage of the gross receipts from the operation of the hotel property. Marriott International, Inc. manages the hotel under the Marriott name pursuant to a management contract with the
taxable REIT subsidiary as lessee. While the taxable REIT subsidiary structure allows the economic benefits of ownership to flow to us, the taxable REIT subsidiary is subject to tax on its income from the operations of the hotel at the federal and
state level. In addition, the taxable REIT subsidiary is subject to detailed tax regulations that affect how it may be capitalized and operated. If the tax laws applicable to taxable REIT subsidiaries are modified, we may be forced to modify the
structure for owning our hotel property, and such changes may adversely affect the cash flows from our hotel. In addition, the Internal Revenue Service, the United States Treasury Department and Congress frequently review federal income tax
legislation, and we cannot predict whether, when or to what extent new federal tax laws, regulations, interpretations or rulings will be adopted. Any of such actions may prospectively or retroactively modify the tax treatment of the taxable REIT
subsidiary and, therefore, may adversely affect our after-tax returns from our hotel property.

We face possible adverse changes in tax laws.

From time to time changes in state and local tax laws or regulations are enacted, which may result in an increase in our tax
liability. A shortfall in tax revenues for states and municipalities in which we operate may lead to an increase in the frequency and size of such changes. If such changes occur, we may be required to pay additional taxes on our assets or income.
These increased tax costs could adversely affect our financial condition and results of operations and our ability to make distributions to our securityholders.

We face possible state and local tax audits.

Because Boston Properties, Inc. is organized and qualifies as a REIT,
it is generally not subject to federal income taxes, but is subject to certain state and local taxes. In the normal course of business, certain entities through which we own real estate either have undergone, or are currently undergoing, tax audits.
Although we believe that we have substantial arguments in favor of our positions in the ongoing audits, in some instances there is no controlling precedent or interpretive guidance on the specific point at issue. Collectively, tax deficiency notices
received to date from the jurisdictions conducting the ongoing audits have not been material. However, there can be no assurance that future audits will not occur with increased frequency or that the ultimate result of such audits will not have a
material adverse effect on our results of operations.



|Item 1B. | Unresolved Staff Comments.
|-------- | --------------------------

None.



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|Item 2. | Properties
|------- | ----------

At
December 31, 2008, our portfolio consisted of 147 properties totaling 49.8 million net rentable square feet. Our properties consisted of (1) 143 office properties, comprised of 123 Class A office buildings, including 10
properties under construction, and 20 properties that support both office and technical uses, (2) three retail properties and (3) one hotel. In addition, we own or control 509.3 acres of land for future development. The table set forth
below shows information relating to the properties we owned, or in which we had an ownership interest, at December 31, 2008. On January 7, 2008, we transferred the Mountain View properties to the Value-Added Fund. For the year ended
December 31, 2008, six days of financial results for these properties are included in our consolidated financial results, but not included in any of our portfolio information tables or any other portfolio level statistics. Information relating
to properties owned by the Value-Added Fund is not included in our portfolio information tables or any other portfolio level statistics because the Value-Added Fund invests in assets within our existing markets that have deficiencies in property
characteristics which provide an opportunity to create value through repositioning, refurbishment or renovation. We therefore believe including such information in our portfolio tables and statistics would render the portfolio information less
useful to investors. Information relating to the Value-Added Fund is set forth separately below.



|                                            |  |                         |  |          |   |  |                    |  |                        
|------------------------------------------- |  | ----------------------- |  | -------- | - |  | ------------------ |  | -----------------------
|Properties                                  |  | Location                |  | % Leased |   |  | Number ofBuildings |  | Net RentableSquare Feet
|Class A Office                              |  |                         |  |          |   |  |                    |  |                        
|General Motors Building (60% ownership)     |  | New York, NY            |  | 98.0     | % |  | 1                  |  | 1,770,298              
|399 Park Avenue                             |  | New York, NY            |  | 99.7     | % |  | 1                  |  | 1,700,331              
|Citigroup Center                            |  | New York, NY            |  | 97.7     | % |  | 1                  |  | 1,590,013              
|Times Square Tower                          |  | New York, NY            |  | 97.3     | % |  | 1                  |  | 1,242,384              
|800 Boylston StreetThe Prudential Center   |  | Boston, MA              |  | 93.9     | % |  | 1                  |  | 1,192,899              
|599 Lexington Avenue                        |  | New York, NY            |  | 99.2     | % |  | 1                  |  | 1,037,338              
|Embarcadero Center Four                     |  | San Francisco, CA       |  | 96.6     | % |  | 1                  |  | 936,561                
|111 Huntington AvenueThe Prudential Center |  | Boston, MA              |  | 99.6     | % |  | 1                  |  | 859,642                
|Embarcadero Center One                      |  | San Francisco, CA       |  | 85.5     | % |  | 1                  |  | 830,280                
|Embarcadero Center Two                      |  | San Francisco, CA       |  | 98.6     | % |  | 1                  |  | 778,337                
|Embarcadero Center Three                    |  | San Francisco, CA       |  | 84.2     | % |  | 1                  |  | 774,946                
|South of Market                             |  | Reston, VA              |  | 83.0     | % |  | 3                  |  | 648,279                
|Two Grand Central Tower (60% ownership)     |  | New York, NY            |  | 99.8     | % |  | 1                  |  | 635,275                
|Capital Gallery                             |  | Washington, DC          |  | 100.0    | % |  | 1                  |  | 619,586                
|Metropolitan Square (51% ownership)         |  | Washington, DC          |  | 99.9     | % |  | 1                  |  | 586,887                
|125 West 55thStreet (60%
ownership)         |  | New York, NY            |  | 100.0    | % |  | 1                  |  | 558,008                
|3200 Zanker Road                            |  | San Jose, CA            |  | 100.0    | % |  | 4                  |  | 543,900                
|901 New York Avenue (25% ownership)         |  | Washington, DC          |  | 99.4     | % |  | 1                  |  | 539,229                
|Reservoir Place                             |  | Waltham, MA             |  | 93.1     | % |  | 1                  |  | 527,590                
|601 and 651 Gateway                         |  | South San Francisco, CA |  | 96.6     | % |  | 2                  |  | 506,045                
|101 Huntington AvenueThe Prudential Center |  | Boston, MA              |  | 100.0    | % |  | 1                  |  | 505,939                
|Two Freedom Square                          |  | Reston, VA              |  | 98.8     | % |  | 1                  |  | 421,676                
|One Freedom Square                          |  | Reston, VA              |  | 100.0    | % |  | 1                  |  | 414,433                
|One Tower Center                            |  | East Brunswick, NJ      |  | 49.5     | % |  | 1                  |  | 413,677                
|Market Square North (50% ownership)         |  | Washington, DC          |  | 100.0    | % |  | 1                  |  | 401,279                
|140 Kendrick Street                         |  | Needham, MA             |  | 100.0    | % |  | 3                  |  | 380,987                
|One and Two Discovery Square                |  | Reston, VA              |  | 100.0    | % |  | 2                  |  | 366,990                
|505 9thStreet, N.W. (50%
ownership)         |  | Washington, DC          |  | 100.0    | % |  | 1                  |  | 321,926                
|1333 New Hampshire Avenue                   |  | Washington, DC          |  | 100.0    | % |  | 1                  |  | 315,371                
|One Reston Overlook                         |  | Reston, VA              |  | 100.0    | % |  | 1                  |  | 312,685                
|Waltham Weston Corporate Center             |  | Waltham, MA             |  | 98.1     | % |  | 1                  |  | 306,789                



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|                                          |  |                         |  |          |   |  |                    |  |                        
|----------------------------------------- |  | ----------------------- |  | -------- | - |  | ------------------ |  | -----------------------
|Properties                                |  | Location                |  | % Leased |   |  | Number ofBuildings |  | Net RentableSquare Feet
|230 CityPoint (formerly Prospect Place)   |  | Waltham, MA             |  | 92.6     | % |  | 1                  |  | 301,815                
|540 Madison Avenue (60% ownership)        |  | New York, NY            |  | 92.9     | % |  | 1                  |  | 284,185                
|12310 Sunrise Valley                      |  | Reston, VA              |  | 100.0    | % |  | 1                  |  | 263,870                
|Reston Corporate Center                   |  | Reston, VA              |  | 100.0    | % |  | 2                  |  | 261,046                
|Quorum Office Park                        |  | Chelmsford, MA          |  | 100.0    | % |  | 2                  |  | 259,918                
|New Dominion Technology ParkBuilding Two |  | Herndon, VA             |  | 100.0    | % |  | 1                  |  | 257,400                
|611 Gateway                               |  | South San Francisco, CA |  | 100.0    | % |  | 1                  |  | 256,302                
|12300 Sunrise Valley                      |  | Reston, VA              |  | 100.0    | % |  | 1                  |  | 255,244                
|1330 Connecticut Avenue                   |  | Washington, DC          |  | 100.0    | % |  | 1                  |  | 252,136                
|500 E Street, S. W.                       |  | Washington, DC          |  | 100.0    | % |  | 1                  |  | 248,336                
|200 West Street                           |  | Waltham, MA             |  | 100.0    | % |  | 1                  |  | 248.311                
|Five Cambridge Center                     |  | Cambridge, MA           |  | 99.3     | % |  | 1                  |  | 240,480                
|New Dominion Technology ParkBuilding One |  | Herndon, VA             |  | 100.0    | % |  | 1                  |  | 235,201                
|510 Carnegie Center                       |  | Princeton, NJ           |  | 100.0    | % |  | 1                  |  | 234,160                
|One Cambridge Center                      |  | Cambridge, MA           |  | 81.7     | % |  | 1                  |  | 215,385                
|635 Massachusetts Avenue (1)              |  | Washington, DC          |  | 100.0    | % |  | 1                  |  | 211,000                
|77 CityPoint                              |  | Waltham, MA             |  | 100.0    | % |  | 1                  |  | 209,707                
|Sumner Square                             |  | Washington, DC          |  | 100.0    | % |  | 1                  |  | 208,665                
|Four Cambridge Center                     |  | Cambridge, MA           |  | 95.1     | % |  | 1                  |  | 198,295                
|University Place                          |  | Cambridge, MA           |  | 100.0    | % |  | 1                  |  | 195,282                
|North First Business Park (1)             |  | San Jose, CA            |  | 75.8     | % |  | 5                  |  | 190,636                
|1301 New York Avenue                      |  | Washington, DC          |  | 100.0    | % |  | 1                  |  | 188,358                
|12290 Sunrise Valley                      |  | Reston, VA              |  | 100.0    | % |  | 1                  |  | 182,424                
|2600 Tower Oaks Boulevard                 |  | Rockville, MD           |  | 90.8     | % |  | 1                  |  | 178,887                
|Eight Cambridge Center                    |  | Cambridge, MA           |  | 100.0    | % |  | 1                  |  | 177,226                
|Lexington Office Park                     |  | Lexington, MA           |  | 71.1     | % |  | 2                  |  | 166,373                
|210 Carnegie Center                       |  | Princeton, NJ           |  | 93.7     | % |  | 1                  |  | 161,776                
|206 Carnegie Center                       |  | Princeton, NJ           |  | 100.0    | % |  | 1                  |  | 161,763                
|191 Spring Street                         |  | Lexington, MA           |  | 100.0    | % |  | 1                  |  | 158,900                
|303 Almaden                               |  | San Jose, CA            |  | 94.1     | % |  | 1                  |  | 156,859                
|Kingstowne Two                            |  | Alexandria, VA          |  | 95.7     | % |  | 1                  |  | 156,251                
|10 & 20 Burlington Mall Road              |  | Burlington, MA          |  | 92.4     | % |  | 2                  |  | 153,180                
|Ten Cambridge Center                      |  | Cambridge, MA           |  | 100.0    | % |  | 1                  |  | 152,664                
|Kingstowne One                            |  | Alexandria, VA          |  | 100.0    | % |  | 1                  |  | 150,838                
|214 Carnegie Center                       |  | Princeton, NJ           |  | 80.1     | % |  | 1                  |  | 150,774                
|212 Carnegie Center                       |  | Princeton, NJ           |  | 95.7     | % |  | 1                  |  | 149,354                
|506 Carnegie Center                       |  | Princeton, NJ           |  | 100.0    | % |  | 1                  |  | 136,213                
|Two Reston Overlook                       |  | Reston, VA              |  | 93.8     | % |  | 1                  |  | 134,615                
|508 Carnegie Center                       |  | Princeton, NJ           |  | 56.1     | % |  | 1                  |  | 132,653                
|202 Carnegie Center                       |  | Princeton, NJ           |  | 81.1     | % |  | 1                  |  | 130,582                
|Waltham Office Center (1)                 |  | Waltham, MA             |  | 53.3     | % |  | 3                  |  | 129,262                
|101 Carnegie Center                       |  | Princeton, NJ           |  | 100.0    | % |  | 1                  |  | 123,659                
|Montvale Center                           |  | Gaithersburg, MD        |  | 82.5     | % |  | 1                  |  | 122,808                
|504 Carnegie Center                       |  | Princeton, NJ           |  | 100.0    | % |  | 1                  |  | 121,990                
|91 Hartwell Avenue                        |  | Lexington, MA           |  | 83.8     | % |  | 1                  |  | 121,425                
|40 Shattuck Road                          |  | Andover, MA             |  | 64.4     | % |  | 1                  |  | 120,773                
|Annapolis Junction (50% ownership)        |  | Annapolis, MD           |  | 0.0      | % |  | 1                  |  | 117,599                
|502 Carnegie Center                       |  | Princeton NJ            |  | 100.0    | % |  | 1                  |  | 116,855                



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|                                           |  |                 |  |          |   |  |                    |  |                        
|------------------------------------------ |  | --------------- |  | -------- | - |  | ------------------ |  | -----------------------
|Properties                                 |  | Location        |  | % Leased |   |  | Number ofBuildings |  | Net RentableSquare Feet
|Three Cambridge Center                     |  | Cambridge, MA   |  | 77.7     | % |  | 1                  |  | 108,152                
|201 Spring Street                          |  | Lexington, MA   |  | 100.0    | % |  | 1                  |  | 106,300                
|104 Carnegie Center                        |  | Princeton, NJ   |  | 94.4     | % |  | 1                  |  | 102,830                
|Bedford Business Park                      |  | Bedford, MA     |  | 100.0    | % |  | 1                  |  | 92,207                 
|33 Hayden Avenue                           |  | Lexington, MA   |  | 100.0    | % |  | 1                  |  | 80,128                 
|Eleven Cambridge Center                    |  | Cambridge, MA   |  | 90.2     | % |  | 1                  |  | 79,616                 
|Reservoir Place North                      |  | Waltham, MA     |  | 100.0    | % |  | 1                  |  | 73,258                 
|105 Carnegie Center                        |  | Princeton, NJ   |  | 55.3     | % |  | 1                  |  | 69,955                 
|32 Hartwell Avenue                         |  | Lexington, MA   |  | 100.0    | % |  | 1                  |  | 69,154                 
|302 Carnegie Center                        |  | Princeton, NJ   |  | 100.0    | % |  | 1                  |  | 64,926                 
|195 West Street                            |  | Waltham, MA     |  | 100.0    | % |  | 1                  |  | 63,500                 
|100 Hayden Avenue                          |  | Lexington, MA   |  | 100.0    | % |  | 1                  |  | 55,924                 
|181 Spring Street                          |  | Lexington, MA   |  | 100.0    | % |  | 1                  |  | 55,793                 
|211 Carnegie Center                        |  | Princeton, NJ   |  | 100.0    | % |  | 1                  |  | 47,025                 
|92 Hayden Avenue                           |  | Lexington, MA   |  | 100.0    | % |  | 1                  |  | 31,100                 
|201 Carnegie Center                        |  | Princeton, NJ   |  | 100.0    | % |  |                   |  | 6,500                  
|                                           |  |                 |  |          |   |  |                    |  |                        
|Subtotal for Class A Office Properties     |  |                 |  | 95.1     | % |  | 113                |  | 32,127,383             
|                                           |  |                 |  |          |   |  |                    |  |                        
|Retail                                     |  |                 |  |          |   |  |                    |  |                        
|Shops at The Prudential Center             |  | Boston, MA      |  | 98.5     | % |  | 1                  |  | 509,813                
|Kingstowne Retail                          |  | Alexandria, VA  |  | 94.3     | % |  | 1                  |  | 88,288                 
|Shaws Supermarket at The Prudential Center |  | Boston, MA      |  | 100.0    | % |  | 1                  |  | 57,235                 
|                                           |  |                 |  |          |   |  |                    |  |                        
|Subtotal for Retail Properties             |  |                 |  | 98.0     | % |  | 3                  |  | 655,336                
|                                           |  |                 |  |          |   |  |                    |  |                        
|Office/Technical Properties                |  |                 |  |          |   |  |                    |  |                        
|Bedford Business Park                      |  | Bedford, MA     |  | 62.7     | % |  | 2                  |  | 379,056                
|Seven Cambridge Center                     |  | Cambridge, MA   |  | 100.0    | % |  | 1                  |  | 231,028                
|7601 Boston Boulevard                      |  | Springfield, VA |  | 100.0    | % |  | 1                  |  | 103,750                
|7435 Boston Boulevard                      |  | Springfield, VA |  | 100.0    | % |  | 1                  |  | 103,557                
|8000 Grainger Court                        |  | Springfield, VA |  | 100.0    | % |  | 1                  |  | 88,775                 
|7500 Boston Boulevard                      |  | Springfield, VA |  | 100.0    | % |  | 1                  |  | 79,971                 
|7501 Boston Boulevard                      |  | Springfield, VA |  | 100.0    | % |  | 1                  |  | 75,756                 
|6605 Springfield Center Drive (1)          |  | Springfield, VA |  | 0.0      | % |  | 1                  |  | 68,907                 
|Fourteen Cambridge Center                  |  | Cambridge, MA   |  | 100.0    | % |  | 1                  |  | 67,362                 
|164 Lexington Road                         |  | Billerica, MA   |  | 0.0      | % |  | 1                  |  | 64,140                 
|103 Fourth Avenue (1)                      |  | Waltham, MA     |  | 58.5     | % |  | 1                  |  | 62,476                 
|7450 Boston Boulevard                      |  | Springfield, VA |  | 100.0    | % |  | 1                  |  | 62,402                 
|7374 Boston Boulevard                      |  | Springfield, VA |  | 100.0    | % |  | 1                  |  | 57,321                 
|8000 Corporate Court                       |  | Springfield, VA |  | 100.0    | % |  | 1                  |  | 52,539                 
|7451 Boston Boulevard                      |  | Springfield, VA |  | 100.0    | % |  | 1                  |  | 47,001                 
|7300 Boston Boulevard                      |  | Springfield, VA |  | 100.0    | % |  | 1                  |  | 32,000                 
|17 Hartwell Avenue                         |  | Lexington, MA   |  | 100.0    | % |  | 1                  |  | 30,000                 
|7375 Boston Boulevard                      |  | Springfield, VA |  | 100.0    | % |  | 1                  |  | 26,865                 
|6601 Springfield Center Drive (1)          |  | Springfield, VA |  | 100.0    | % |  | 1                  |  | 26,388                 
|                                           |  |                 |  |          |   |  |                    |  |                        
|Subtotal for Office/Technical Properties   |  |                 |  | 81.9     | % |  | 20                 |  | 1,659,294              
|                                           |  |                 |  |          |   |  |                    |  |                        



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|                                                     |  |                 |  |          |         |  |                    |  |                        
|---------------------------------------------------- |  | --------------- |  | -------- | ------- |  | ------------------ |  | -----------------------
|Properties                                           |  | Location        |  | % Leased |         |  | Number ofBuildings |  | Net RentableSquare Feet
|Hotel Property                                       |  |                 |  |          |         |  |                    |  |                        
|Cambridge Center Marriott                            |  | Cambridge, MA   |  | 77.7     | %(2)    |  | 1                  |  | 330,400                
|                                                     |  |                 |  |          |         |  |                    |  |                        
|Subtotal for Hotel Property                          |  |                 |  | 77.7     | %       |  | 1                  |  | 330,400                
|                                                     |  |                 |  |          |         |  |                    |  |                        
|Structured Parking                                   |  |                 |  | n/a      |         |  |                   |  | 11,219,345             
|                                                     |  |                 |  |          |         |  |                    |  |                        
|Subtotal for In-Service Properties                   |  |                 |  | 94.5     | %       |  | 137                |  | 45,991,758             
|                                                     |  |                 |  |          |         |  |                    |  |                        
|Properties Under Construction                        |  |                 |  |          |         |  |                    |  |                        
|250 West 55thStreet                                  |  | New York, NY    |  | 22       | %(3)(4) |  | 1                  |  | 1,000,000              
|Russia Wharf                                         |  | Boston, MA      |  | 78       | %(3)(5) |  | 2                  |  | 815,000                
|2200 Pennsylvania Avenue                             |  | Washington, DC  |  | 42       | %(3)(6) |  | 2                  |  | 780,000                
|Weston Corporate Center                              |  | Weston, MA      |  | 100      | %(3)    |  | 1                  |  | 356,367                
|Wisconsin Place (66.67% ownership)                   |  | Chevy Chase, MD |  | 91       | %(3)    |  | 1                  |  | 290,000                
|Democracy Tower (formerly South of Market- Phase II) |  | Reston, VA      |  | 100      | %(3)    |  | 1                  |  | 225,000                
|One Preserve Parkway                                 |  | Rockville, MD   |  | 20       | %(3)(7) |  | 1                  |  | 183,000                
|701 Carnegie Center                                  |  | Princeton, NJ   |  | 100      | %(3)    |  | 1                  |  | 120,000                
|                                                     |  |                 |  |          |         |  |                    |  |                        
|Subtotal for Properties Under Construction           |  |                 |  | 58       | %       |  | 10                 |  | 3,769,367              
|                                                     |  |                 |  |          |         |  |                    |  |                        
|Total Portfolio                                      |  |                 |  |          |         |  | 147                |  | 49,761,125             
|                                                     |  |                 |  |          |         |  |                    |  |                        



|(1) | Property held for redevelopment as of December 31, 2008.
|--- | --------------------------------------------------------

|(2) | Represents the weighted-average room occupancy for the year ended December 31, 2008. Note that this amount is not included in the calculation of the Total Portfolio occupancy
rate for In-Service Properties as of December 31, 2008.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | Represents percentage leased as of February 23, 2009.
|--- | -----------------------------------------------------

|(4) | On February 6, 2009, we announced that we were suspending construction of this building.
|--- | ----------------------------------------------------------------------------------------

|(5) | Percentage leased excludes 235,000 square feet of residential space and includes 28,000 square feet of retail space.
|--- | --------------------------------------------------------------------------------------------------------------------

|(6) | Percentage leased excludes 330,000 square feet of residential space for rent or sale.
|--- | -------------------------------------------------------------------------------------

|(7) | Property was partially placed in-service during the second quarter of 2008.
|--- | ---------------------------------------------------------------------------

On January 7, 2008, we transferred the Mountain View properties to the Value-Added Fund. For the year ended December 31, 2008, six days of financial results for these properties are included in our
consolidated financial results, but not included in any of our portfolio information tables or any other portfolio level statistics. The following table shows information relating to properties owned through the Value-Added Fund at December 31,
2008:



|                              |  |                   |  |          |   |  |                    |  |                        
|----------------------------- |  | ----------------- |  | -------- | - |  | ------------------ |  | -----------------------
|Property                      |  | Location          |  | % Leased |   |  | Number ofBuildings |  | Net RentableSquare Feet
|Mountain View Research Park   |  | Mountain View, CA |  | 60.8     | % |  | 16                 |  | 600,449                
|One and Two Circle Star Way   |  | San Carlos, CA    |  | 45.2     | % |  | 2                  |  | 206,945                
|Mountain View Technology Park |  | Mountain View, CA |  | 70.6     | % |  | 7                  |  | 135,279                
|300 Billerica Road            |  | Chelmsford, MA    |  | 100.0    | % |  | 1                  |  | 110,882                
|                              |  |                   |  |          |   |  |                    |  |                        
|Total Value-Added Fund        |  |                   |  | 63.1     | % |  | 26                 |  | 1,053,555              
|                              |  |                   |  |          |   |  |                    |  |                        



37



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Top 20 Tenants by Square Feet

Our 20 largest tenants by square feet as of December 31, 2008 were as follows:



|   |  |                                  |  |             |     |  |                          |  
|-- |  | -------------------------------- |  | ----------- | --- |  | ------------------------ | -
|   |  | Tenant                           |  | Square Feet |     |  | % of In-ServicePortfolio |  
|1  |  | US Government                    |  | 1,825,576   | (1) |  | 5.30                     | %
|2  |  | Lockheed Martin                  |  | 1,292,429   |     |  | 3.75                     | %
|3  |  | Citibank                         |  | 1,085,570   | (2) |  | 3.15                     | %
|4  |  | Genentech                        |  | 546,750     |     |  | 1.59                     | %
|5  |  | Kirkland & Ellis                 |  | 502,046     | (3) |  | 1.46                     | %
|6  |  | Gillette                         |  | 484,051     |     |  | 1.41                     | %
|7  |  | Shearman & Sterling              |  | 472,808     |     |  | 1.37                     | %
|8  |  | Weil Gotshal Manges              |  | 456,744     | (4) |  | 1.33                     | %
|9  |  | OMelveny & Myers                |  | 446,039     |     |  | 1.30                     | %
|10 |  | Lehman Brothers                  |  | 436,723     | (5) |  | 1.27                     | %
|11 |  | Parametric Technology            |  | 380,987     |     |  | 1.11                     | %
|12 |  | Accenture                        |  | 378,867     |     |  | 1.10                     | %
|13 |  | Finnegan Henderson Farabow       |  | 356,195     | (6) |  | 1.03                     | %
|14 |  | Ann Taylor                       |  | 338,942     |     |  | 0.98                     | %
|15 |  | Northrop Grumman                 |  | 327,677     |     |  | 0.95                     | %
|16 |  | Biogen Idec                      |  | 317,341     | (7) |  | 0.92                     | %
|17 |  | Washington Group International   |  | 299,079     |     |  | 0.87                     | %
|18 |  | Aramis (Estee Lauder)            |  | 295,610     | (8) |  | 0.86                     | %
|19 |  | Bingham McCutchen                |  | 291,415     |     |  | 0.85                     | %
|20 |  | Akin Gump Strauss Hauer & Feld   |  | 290,132     |     |  | 0.84                     | %
|   |  | Total % of Portfolio Square Feet |  |             |     |  | 31.44                    | %



|(1) | Includes 116,353, 68,252 and 28,384 square feet of space in properties in which Boston Properties has a 60%, 51% and 50% interest, respectively.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------

|(2) | Includes 10,080 and 2,761 square feet of space in properties in which Boston Properties has a 60% and 51% interest, respectively.
|--- | ---------------------------------------------------------------------------------------------------------------------------------

|(3) | Includes 218,134 square feet of space in a property in which Boston Properties has a 51% interest.
|--- | --------------------------------------------------------------------------------------------------

|(4) | Includes 456,744 square feet of space in a property in which Boston Properties has a 60% interest.
|--- | --------------------------------------------------------------------------------------------------

|(5) | Lehman Brothers Inc. has filed for bankruptcy.
|--- | ----------------------------------------------

|(6) | Includes 258,990 square feet of space in a property in which Boston Properties has a 25% interest.
|--- | --------------------------------------------------------------------------------------------------

|(7) | Excludes 356,367 square feet leased for a future development in Weston, MA.
|--- | ---------------------------------------------------------------------------

|(8) | Includes 295,610 square feet of space in a property in which Boston Properties has a 60% interest.
|--- | --------------------------------------------------------------------------------------------------



38



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##### Table of Contents

Tenant Diversification (Gross Rent)*

Our tenant diversification as of December 31, 2008 was as follows:



|                                   |  |                         |  
|---------------------------------- |  | ----------------------- | -
|Sector                             |  | Percentage ofGross Rent |  
|Legal Services                     |  | 26                      | %
|Financial Services                 |  | 25                      | %
|Technical and Scientific Services  |  | 11                      | %
|Retail                             |  | 9                       | %
|Other Professional Services        |  | 8                       | %
|Manufacturing                      |  | 7                       | %
|Other                              |  | 5                       | %
|Government / Public Administration |  | 4                       | %
|Media / Telecommunications         |  | 3                       | %
|Real Estate and Insurance          |  | 2                       | %



|* | The classification of our tenants is based on the U.S. Governments North American Industry Classification System (NAICS), which has replaced the Standard Industrial
Classification (SIC) system.
|- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Lease Expirations (1)



|                         |  |                                             |  |                                                                                |             |                                                                                       |   |                                                                             |  |                                                                                    |             |                               |   |       |  |      |  
|------------------------ |  | ------------------------------------------- |  | ------------------------------------------------------------------------------ | ----------- | ------------------------------------------------------------------------------------- | - | --------------------------------------------------------------------------- |  | ---------------------------------------------------------------------------------- | ----------- | ----------------------------- | - | ----- |  | ---- | -
|Year of Lease Expiration |  | RentableSquare FeetSubject toExpiringLeases |  | CurrentAnnualized(2)ContractualRent UnderExpiring LeasesWithout
FutureStep-Ups |             | CurrentAnnualized(2)ContractualRent UnderExpiring LeasesWithout FutureStep-Ups
p.s.f. |   | CurrentAnnualizedContractualRent UnderExpiring LeasesWith FutureStep-ups(3) |  | CurrentAnnualizedContractual RentUnder ExpiringLeases WithFutureStep-ups p.s.f.(3) |             | Percentageof TotalSquare Feet |  
|2009                     |  | 2,295,421                                   |  | $                                                                              | 93,017,946  |                                                                                       | $ | 40.52                                                                       |  | $                                                                                  | 94,670,486  |                               | $ | 41.24 |  | 6.7  | %
|2010                     |  | 3,206,394                                   |  |                                                                                | 125,793,989 |                                                                                       |   | 39.23                                                                       |  |                                                                                    | 128,793,296 |                               |   | 40.17 |  | 9.3  | %
|2011                     |  | 3,237,825                                   |  |                                                                                | 154,478,643 |                                                                                       |   | 47.71                                                                       |  |                                                                                    | 158,444,134 |                               |   | 48.94 |  | 9.4  | %
|2012                     |  | 3,163,836                                   |  |                                                                                | 149,580,349 |                                                                                       |   | 47.28                                                                       |  |                                                                                    | 154,113,400 |                               |   | 48.71 |  | 9.2  | %
|2013                     |  | 1,396,615                                   |  |                                                                                | 61,486,594  |                                                                                       |   | 44.03                                                                       |  |                                                                                    | 65,185,886  |                               |   | 46.67 |  | 4.1  | %
|2014                     |  | 2,737,687                                   |  |                                                                                | 107,713,897 |                                                                                       |   | 39.34                                                                       |  |                                                                                    | 114,799,171 |                               |   | 41.93 |  | 7.9  | %
|2015                     |  | 1,894,419                                   |  |                                                                                | 91,562,625  |                                                                                       |   | 48.33                                                                       |  |                                                                                    | 103,723,910 |                               |   | 54.75 |  | 5.5  | %
|2016                     |  | 2,889,182                                   |  |                                                                                | 184,496,405 |                                                                                       |   | 63.86                                                                       |  |                                                                                    | 199,290,537 |                               |   | 68.98 |  | 8.4  | %
|2017                     |  | 2,925,119                                   |  |                                                                                | 199,612,564 |                                                                                       |   | 68.24                                                                       |  |                                                                                    | 218,535,840 |                               |   | 74.71 |  | 8.5  | %
|2018                     |  | 723,310                                     |  |                                                                                | 46,233,541  |                                                                                       |   | 63.92                                                                       |  |                                                                                    | 53,304,665  |                               |   | 73.70 |  | 2.1  | %
|Thereafter               |  | 7,869,508                                   |  |                                                                                | 453,349,356 |                                                                                       |   | 57.61                                                                       |  |                                                                                    | 577,919,237 |                               |   | 73.44 |  | 22.8 | %



|(1) | Includes 100% of unconsolidated joint venture properties. Does not include any data on properties owned by the Value-Added Fund.
|--- | --------------------------------------------------------------------------------------------------------------------------------

|(2) | Represents the monthly contractual base rent and recoveries from tenants under existing leases as of December 31, 2008 multiplied by twelve. This amount reflects total rent
before any rent abatements and includes expense reimbursements, which may be estimates as of such date.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | Represents the monthly contractual base rent under expiring leases with future contractual increases upon expiration and recoveries from tenants under existing leases as of
December 31, 2008 multiplied by twelve. This amount reflects total rent before any rent abatements and includes expense reimbursements, which may be estimates as of such date.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|Item 3. | Legal Proceedings
|------- | -----------------

We are
subject to various legal proceedings and claims that arise in the ordinary course of business. These matters are generally covered by insurance. Management believes that the final outcome of such matters will not have a material adverse effect on
our financial position, results of operations or liquidity.



|Item 4. | Submission of Matters to a Vote of Security Holders
|------- | ---------------------------------------------------

None.



39



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##### Table of Contents

PART II



|Item 5. | Market for Registrants Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
|------- | ------------------------------------------------------------------------------------------------------------

(a) There is no established public trading market for the common units. On February 23, 2009, there were approximately 304 holders of record and
141,155,936 common units outstanding, 121,265,984 of which were held by Boston Properties, Inc. The following table sets forth the quarterly distributions per common unit for the periods presented.



|                   |  |                              |      |    
|------------------ |  | ---------------------------- | ---- | ---
|Quarter Ended      |  | Distributions percommon unit |     
|December 31, 2008  |  | $                            | .68  |    
|September 30, 2008 |  |                              | .68  |    
|June 30, 2008      |  |                              | .68  |    
|March 31, 2008     |  |                              | .68  |    
|December 31, 2007  |  |                              | 6.66 | (1)
|September 30, 2007 |  |                              | .68  |    
|June 30, 2007      |  |                              | .68  |    
|March 31, 2007     |  |                              | .68  |    



|(1) | Paid on January 30, 2008 to common and LITP unitholders of record as of the close of business on December 31, 2007. Amount includes a $5.98 per common unit special
distribution.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

In order to maintain Boston Properties, Inc.s qualification as a REIT, it must make annual distributions
to its stockholders of at least 90% of its taxable income (not including net capital gains). Boston Properties, Inc. has adopted a policy of paying regular quarterly dividends on its common stock, and we have adopted a policy of paying regular
quarterly distributions on our common units. Cash distributions have been paid on the common stock of Boston Properties, Inc. and our common units since the initial public offering of Boston Properties, Inc. Distributions are declared at the
discretion of the Board of Directors of Boston Properties, Inc. and depend on actual and anticipated cash from operations, our financial condition, capital requirements, the annual distribution requirements under the REIT provisions of the Internal
Revenue Code and other factors Boston Properties, Inc.s Board of Directors may consider relevant.

Each time Boston Properties, Inc.
issues shares of stock (other than in exchange for OP Units when such OP Units are presented for redemption), it contributes the proceeds of such issuance to us in return for an equivalent number of partnership units with rights and preferences
analogous to the shares issued. During the fourth quarter 2008, in connection with issuance of common stock by Boston Properties, Inc. pursuant to exercises of stock options under the 1997 Plan, we issued an aggregate of approximately 1,043,337 OP
Units to Boston Properties, Inc. in exchange for approximately $38.0 million, the aggregate proceeds of the common stock issuances by Boston Properties, Inc. Such units were issued in reliance on an exemption from registration under
Section 4(2) of the Securities Act of 1933, as amended.

(b) None.

(c) Issuer Purchases of Equity Securities.



40



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##### Table of Contents

|                                   |  |                                 |     |  |                              |      |                                                                            |     |                                                                             |    
|---------------------------------- |  | ------------------------------- | --- |  | ---------------------------- | ---- | -------------------------------------------------------------------------- | --- | --------------------------------------------------------------------------- | ---
|Period                             |  | (a)TotalNumber ofUnitsPurchased |     |  | (b)AveragePrice Paidper Unit |      | (c)TotalNumber ofUnitsPurchasedas Part
ofPubliclyAnnouncedPlans orPrograms |     | (d)MaximumNumber (orApproximateDollarValue) ofUnits
thatMay Yet bePurchased
|October 1, 2008October 31, 2008   |  | 6,505                           | (1) |  | $                            | 0.21 |                                                                            | N/A |                                                                             | N/A
|November 1, 2008November 30, 2008 |  |                                |     |  |                              |     |                                                                            | N/A |                                                                             | N/A
|December 1, 2008December 31, 2008 |  |                                |     |  |                              |     |                                                                            | N/A |                                                                             | N/A
|                                   |  |                                 |     |  |                              |      |                                                                            |     |                                                                             |    
|Total                              |  | 6,505                           | (1) |  | $                            | 0.21 |                                                                            | N/A |                                                                             | N/A



|(1) | Includes 1,070 OP Units previously held by Boston Properties, Inc. that were redeemed in connection with the repurchase of restricted shares of common stock of Boston Properties,
Inc. in connection with the termination of a certain employees employment with us. Under the terms of the applicable restricted stock agreement, all of such shares were repurchased by Boston Properties, Inc. at a price of $0.01 per share,
which was the amount originally paid by such employee for the shares. Also includes 512 LTIP Units and 4,923 2008 OPP Units that were repurchased in connection with the termination of certain employees employment with us. Under the terms of
the applicable LTIP Unit vesting agreements and OPP Award agreements, these LTIP Units and 2008 OPP Units were repurchased by us at a price of $0.25 per unit, which was the amount originally paid by such employees for the units.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



41



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##### Table of Contents

|Item 6. | Selected Financial Data
|------- | -----------------------

The
following table sets forth our selected financial and operating data on a historical basis, which has been revised for the reclassification of (1) the restatement of earnings per unit to include the effects of participating securities in
accordance with EITF 03-6 and (2) the disposition of qualifying properties during 2007, 2006, 2005 and 2004 which have been reclassified as discontinued operations, for the periods presented, in accordance with SFAS No. 144. Refer to Note
20 of the Consolidated Financial Statements. The following data should be read in conjunction with our financial statements and notes thereto and Managements Discussion and Analysis of Financial Condition and Results of Operations included
elsewhere in this Form 10-K.

Our historical operating results may not be comparable to our future operating results.



|                                                                                                                                |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|------------------------------------------------------------------------------------------------------------------------------- |  | ------------------------------------- | --------- | - | ---- | - | --------- | ---- |  | - | --------- | - |  | ---- | --------- | - |  | - | --------- | -
|                                                                                                                                |  | For the year ended December 31,       |          
|                                                                                                                                |  | 2008                                  |           |   | 2007 |   |           | 2006 |  |   | 2005      |   |  | 2004 |          
|                                                                                                                                |  | (in thousands, except per share data) |          
|Statement of Operations Information:                                                                                            |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Total revenue                                                                                                                   |  | $                                     | 1,488,400 |   |      | $ | 1,482,289 |      |  | $ | 1,417,627 |   |  | $    | 1,382,866 |   |  | $ | 1,334,225 |  
|                                                                                                                                |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Expenses:                                                                                                                       |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Rental operating                                                                                                                |  |                                       | 488,030   |   |      |   | 455,840   |      |  |   | 437,705   |   |  |      | 434,353   |   |  |   | 412,604   |  
|Hotel operating                                                                                                                 |  |                                       | 27,510    |   |      |   | 27,765    |      |  |   | 24,966    |   |  |      | 22,776    |   |  |   | 21,709    |  
|General and administrative                                                                                                      |  |                                       | 72,365    |   |      |   | 69,882    |      |  |   | 59,375    |   |  |      | 55,471    |   |  |   | 53,636    |  
|Interest                                                                                                                        |  |                                       | 271,972   |   |      |   | 285,887   |      |  |   | 298,260   |   |  |      | 308,091   |   |  |   | 306,170   |  
|Depreciation and amortization                                                                                                   |  |                                       | 296,122   |   |      |   | 278,249   |      |  |   | 266,411   |   |  |      | 258,332   |   |  |   | 242,864   |  
|Net derivative losses                                                                                                           |  |                                       | 17,021    |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Losses from investments in securities                                                                                           |  |                                       | 4,604     |   |      |   |          |      |  |   |          |   |  |      |          |   |  |   |          |  
|Losses from early extinguishments of debt                                                                                       |  |                                       |          |   |      |   | 3,417     |      |  |   | 32,143    |   |  |      | 12,896    |   |  |   | 6,258     |  
|                                                                                                                                |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Income before income (loss) from unconsolidated joint ventures and minority interests in property partnerships                  |  |                                       | 310,776   |   |      |   | 361,249   |      |  |   | 298,767   |   |  |      | 290,947   |   |  |   | 290,984   |  
|Income (loss) from unconsolidated joint ventures                                                                                |  |                                       | (182,018  | ) |      |   | 20,428    |      |  |   | 24,507    |   |  |      | 4,829     |   |  |   | 3,380     |  
|Minority interests in property partnerships                                                                                     |  |                                       | (1,997    | ) |      |   | (84       | )    |  |   | 2,013     |   |  |      | 6,017     |   |  |   | 4,685     |  
|                                                                                                                                |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Income before gains on sales of real estate and other assets                                                                    |  |                                       | 126,761   |   |      |   | 381,593   |      |  |   | 325,287   |   |  |      | 301,793   |   |  |   | 299,049   |  
|Gains on sales of real estate and other assets                                                                                  |  |                                       | 33,340    |   |      |   | 957,406   |      |  |   | 727,131   |   |  |      | 188,546   |   |  |   | 9,822     |  
|                                                                                                                                |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Income before discontinued operations                                                                                           |  |                                       | 160,101   |   |      |   | 1,338,999 |      |  |   | 1,052,418 |   |  |      | 490,339   |   |  |   | 308,871   |  
|Discontinued operations                                                                                                         |  |                                       |          |   |      |   | 274,091   |      |  |   | 19,081    |   |  |      | 76,272    |   |  |   | 53,062    |  
|                                                                                                                                |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Income before cumulative effect of a change in accounting principle                                                             |  |                                       | 160,101   |   |      |   | 1,613,090 |      |  |   | 1,071,499 |   |  |      | 566,611   |   |  |   | 361,933   |  
|Cumulative effect of a change in accounting principle                                                                           |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      | (5,043    | ) |  |   |          |  
|                                                                                                                                |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Income before preferred distributions and allocation of undistributed earnings                                                  |  |                                       | 160,101   |   |      |   | 1,613,090 |      |  |   | 1,071,499 |   |  |      | 561,568   |   |  |   | 361,933   |  
|Preferred distributions and allocation of undistributed earnings                                                                |  |                                       | (4,226    | ) |      |   | (15,014   | )    |  |   | (22,814   | ) |  |      | (26,780   | ) |  |   | (17,133   | )
|                                                                                                                                |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Net income available to common unitholders                                                                                      |  | $                                     | 155,875   |   |      | $ | 1,598,076 |      |  | $ | 1,048,685 |   |  | $    | 534,788   |   |  | $ | 344,800   |  
|                                                                                                                                |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Basic earnings per common unit:                                                                                                 |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Income available to common unitholders before discontinued operations and cumulative effect of a change in accounting
principle |  | $                                     | 1.11      |   |      | $ | 9.50      |      |  | $ | 7.58      |   |  | $    | 3.49      |   |  | $ | 2.28      |  
|Discontinued operations                                                                                                         |  |                                       |          |   |      |   | 1.97      |      |  |   | 0.14      |   |  |      | 0.57      |   |  |   | 0.41      |  
|Cumulative effect of a change in accounting principle                                                                           |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      | (0.04     | ) |  |   |          |  
|                                                                                                                                |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Net income available to common unitholders                                                                                      |  | $                                     | 1.11      |   |      | $ | 11.47     |      |  | $ | 7.72      |   |  | $    | 4.02      |   |  | $ | 2.69      |  
|                                                                                                                                |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Weighted average number of common units outstanding                                                                             |  |                                       | 140,336   |   |      |   | 139,290   |      |  |   | 135,923   |   |  |      | 132,881   |   |  |   | 128,313   |  
|                                                                                                                                |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Diluted earnings per common unit:                                                                                               |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Income available to common unitholders before discontinued operations and cumulative effect of a change in accounting
principle |  | $                                     | 1.10      |   |      | $ | 9.38      |      |  | $ | 7.44      |   |  | $    | 3.44      |   |  | $ | 2.23      |  
|Discontinued operations                                                                                                         |  |                                       |          |   |      |   | 1.94      |      |  |   | 0.14      |   |  |      | 0.56      |   |  |   | 0.41      |  
|Cumulative effect of a change in accounting principle                                                                           |  |                                       |          |   |      |   |          |      |  |   |          |   |  |      | (0.04     | ) |  |   |          |  
|                                                                                                                                |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Net income available to common unitholders                                                                                      |  | $                                     | 1.10      |   |      | $ | 11.32     |      |  | $ | 7.58      |   |  | $    | 3.96      |   |  | $ | 2.64      |  
|                                                                                                                                |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  
|Weighted average number of common and common equivalent units outstanding                                                       |  |                                       | 141,655   |   |      |   | 141,231   |      |  |   | 138,279   |   |  |      | 135,166   |   |  |   | 130,617   |  
|                                                                                                                                |  |                                       |           |   |      |   |           |      |  |   |           |   |  |      |           |   |  |   |           |  



42



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|                                                                  |  |                                                     |            |   |      |   |            |      |  |   |           |   |  |      |           |   |  |   |           |  
|----------------------------------------------------------------- |  | --------------------------------------------------- | ---------- | - | ---- | - | ---------- | ---- |  | - | --------- | - |  | ---- | --------- | - |  | - | --------- | -
|                                                                  |  | December 31,                                        |           
|                                                                  |  | 2008                                                |            |   | 2007 |   |            | 2006 |  |   | 2005      |   |  | 2004 |          
|                                                                  |  | (in thousands)                                      |           
|Balance Sheet information:                                        |  |                                                     |            |   |      |   |            |      |  |   |           |   |  |      |           |   |  |   |           |  
|Real estate, gross                                                |  | $                                                   | 10,178,198 |   |      | $ | 9,831,390  |      |  | $ | 9,211,351 |   |  | $    | 9,001,776 |   |  | $ | 9,171,944 |  
|Real estate, net                                                  |  |                                                     | 8,433,950  |   |      |   | 8,316,195  |      |  |   | 7,828,431 |   |  |      | 7,742,677 |   |  |   | 8,032,166 |  
|Cash and cash equivalents                                         |  |                                                     | 241,510    |   |      |   | 1,506,921  |      |  |   | 725,788   |   |  |      | 261,496   |   |  |   | 239,344   |  
|Total assets                                                      |  |                                                     | 10,496,036 |   |      |   | 10,790,644 |      |  |   | 9,363,050 |   |  |      | 8,758,943 |   |  |   | 8,947,536 |  
|Total indebtedness                                                |  |                                                     | 6,271,916  |   |      |   | 5,492,166  |      |  |   | 4,600,937 |   |  |      | 4,826,254 |   |  |   | 5,011,814 |  
|Minority interests in property partnerships                       |  |                                                     | 6,900      |   |      |   | 25,805     |      |  |   | 12,454    |   |  |      | 17,954    |   |  |   | 26,912    |  
|Redeemable preferred units                                        |  |                                                     | 1,277,395  |   |      |   | 2,057,287  |      |  |   | 2,639,799 |   |  |      | 1,973,040 |   |  |   | 1,751,225 |  
|Partners capital                                                 |  |                                                     | 2,479,990  |   |      |   | 1,837,632  |      |  |   | 862,509   |   |  |      | 1,522,195 |   |  |   | 1,828,572 |  
|                                                                  | 
|                                                                  |  | For the year ended December 31,                     |           
|                                                                  |  | 2008                                                |            |   | 2007 |   |            | 2006 |  |   | 2005      |   |  | 2004 |          
|                                                                  |  | (in thousands, except per unit and percentage data) |           
|Other Information:                                                |  |                                                     |            |   |      |   |            |      |  |   |           |   |  |      |           |   |  |   |           |  
|Funds from operations (1)                                         |  | $                                                   | 495,646    |   |      | $ | 656,649    |      |  | $ | 593,740   |   |  | $    | 572,877   |   |  | $ | 553,829   |  
|Funds from operations, as adjusted (1)                            |  |                                                     | 495,646    |   |      |   | 659,324    |      |  |   | 625,184   |   |  |      | 583,918   |   |  |   | 553,829   |  
|Distributions per common unit                                     |  |                                                     | 2.72       |   |      |   | 8.70       |      |  |   | 8.12      |   |  |      | 5.19      |   |  |   | 2.58      |  
|Cash flow provided by operating activities                        |  |                                                     | 560,908    |   |      |   | 629,378    |      |  |   | 527,979   |   |  |      | 472,249   |   |  |   | 429,506   |  
|Cash flow provided by (used in) investing activities              |  |                                                     | (1,315,676 | ) |      |   | 576,931    |      |  |   | 229,756   |   |  |      | 356,605   |   |  |   | (171,014  | )
|Cash flow used in financing activities                            |  |                                                     | (510,643   | ) |      |   | (425,176   | )    |  |   | (293,443  | ) |  |      | (806,702  | ) |  |   | (41,834   | )
|Total square feet at end of year (including development projects) |  |                                                     | 49,761     |   |      |   | 43,814     |      |  |   | 43,389    |   |  |      | 42,013    |   |  |   | 44,117    |  
|In-service percentage leased rate at end of year                  |  |                                                     | 94.5       | % |      |   | 94.9       | %    |  |   | 94.2      | % |  |      | 93.8      | % |  |   | 92.1      | %



|(1) | Pursuant to the revised definition of Funds from Operations adopted by the Board of Governors of the National Association of Real Estate Investment Trusts (NAREIT), we
calculate Funds from Operations, or FFO, by adjusting net income (loss) (computed in accordance with GAAP, including non-recurring items) for gains (or losses) from sales of properties, real estate related depreciation and amortization,
and after adjustment for unconsolidated partnerships, joint ventures and preferred distributions. FFO is a non-GAAP financial measure. The use of FFO, combined with the required primary GAAP presentations, has been fundamentally beneficial in
improving the understanding of operating results of REITs among the investing public and making comparisons of REIT operating results more meaningful. Management generally considers FFO to be a useful measure for reviewing our comparative operating
and financial performance because, by excluding gains and losses related to sales of previously depreciated operating real estate assets and excluding real estate asset depreciation and amortization (which can vary among owners of identical assets
in similar condition based on historical cost accounting and useful life estimates), FFO can help one compare the operating performance of a companys real estate between periods or as compared to different companies. Our computation of FFO may
not be comparable to FFO reported by other REITs or real estate companies that do not define the term in accordance with the current NAREIT definition or that interpret the current NAREIT definition differently.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

In addition to presenting FFO in accordance with the NAREIT definition, we also disclose FFO, as adjusted, which excludes the effects of the losses from
early extinguishments of debt associated with the sales of real estate. Losses from early extinguishments of debt result when the sale of real estate encumbered by debt requires us to pay the extinguishment costs prior to the debts stated
maturity and to write-off unamortized loan costs at the date of the extinguishment. Such costs are excluded from the gains on sales of real estate reported in accordance with GAAP. However, we view the losses from early extinguishments of
debt associated with the sales of real estate as an incremental cost of the sale transactions because we extinguished the debt in connection with the consummation of the sale transactions and we had no intent to extinguish the debt absent such
transactions. We believe that adjusting FFO to exclude these losses more appropriately reflects the results of our operations exclusive of the impact of our sale transactions.

Although our FFO, as adjusted, clearly differs from NAREITs definition of FFO, and may not be comparable to that of other REITs and real estate
companies, we believe it provides a meaningful supplemental measure of our operating performance because we believe that by excluding the effects of the losses from early extinguishments of debt associated with the sales of real estate, management
and investors are presented with an indicator of our operating performance that more closely achieves the objectives of the real estate industry in presenting FFO.

Neither FFO, nor FFO as adjusted, should be considered as an alternative to net income available to common unitholders (determined in accordance with GAAP) as an indication of our performance. Neither FFO nor FFO, as
adjusted, represent cash generated from operating activities determined in accordance with GAAP and neither of these measures is a measure of liquidity or an indicator of our ability to make cash distributions. We believe that to further understand
our performance, FFO and FFO, as adjusted should be compared with our reported net income and considered in addition to cash flows in accordance with GAAP, as presented in our Consolidated Financial Statements.

A reconciliation of FFO, and FFO, as adjusted, to net income available to common unitholders computed in accordance with GAAP is provided under the
heading of Managements Discussion and Analysis of Financial Condition and Results of OperationsFunds from Operations.



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|Item 7. | Managements Discussion and Analysis of Financial Condition and Results of Operations
|------- | -------------------------------------------------------------------------------------

The following discussion should be read in conjunction with the financial statements and notes thereto appearing elsewhere in this report.

Forward-Looking Statements

This Annual Report on
Form 10-K contains forward-looking statements within the meaning of the federal securities laws, principally, but not only, under the captions Business-Business and Growth Strategies, Risk Factors and Managements
Discussion and Analysis of Financial Condition and Results of Operations. We caution investors that any forward-looking statements in this report, or which management may make orally or in writing from time to time, are based on
managements beliefs and on assumptions made by, and information currently available to, management. When used, the words anticipate, believe, estimate, expect, intend,
may, might, plan, project, result should, will, and similar expressions which do not relate solely to historical matters are intended to identify forward-looking
statements. Such statements are subject to risks, uncertainties and assumptions and are not guarantees of future performance, which may be affected by known and unknown risks, trends, uncertainties and factors that are beyond our control. Should one
or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may differ materially from those anticipated, estimated or projected by the forward-looking statements. We caution you that, while
forward-looking statements reflect our good faith beliefs when we make them, they are not guarantees of future performance and are impacted by actual events when they occur after we make such statements. We expressly disclaim any responsibility to
update our forward-looking statements, whether as a result of new information, future events or otherwise. Accordingly, investors should use caution in relying on past forward-looking statements, which are based on results and trends at the time
they are made, to anticipate future results or trends.

Some of the risks and uncertainties that may cause our actual results, performance
or achievements to differ materially from those expressed or implied by forward-looking statements include, among others, the following:



| |  |  | the impact of the current credit crisis and global economic slowdown, which is having and may continue to have a negative effect on the following, among other
things:
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the fundamentals of our business, including overall market occupancy and rental rates;
| | - |  | --------------------------------------------------------------------------------------



| |  |  | the financial condition of our tenants, many of which are financial, legal and other professional firms, our lenders, counterparties to our derivative financial
instruments and institutions that hold our cash balances and short-term investments, which may expose us to increased risks of default by these parties;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to obtain debt financing on attractive terms or at all, which may adversely impact our ability to pursue acquisition and development opportunities and
refinance existing debt and our future interest expense; and
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the value of our real estate assets, which may limit our ability dispose of assets at attractive prices or obtain or maintain debt financing secured by our
properties or on an unsecured basis;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | general risks affecting the real estate industry (including, without limitation, the inability to enter into or renew leases, dependence on tenants financial
condition, and competition from other developers, owners and operators of real estate);
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | failure to manage effectively our growth and expansion into new markets and sub-markets or to integrate acquisitions and developments successfully;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the ability of our joint venture partners to satisfy their obligations;
| | - |  | -----------------------------------------------------------------------



| |  |  | risks and uncertainties affecting property development and construction (including, without limitation, construction delays, cost overruns, inability to obtain
necessary permits and public opposition to such activities);
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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##### Table of Contents

| |  |  | risks associated with the availability and terms of financing and the use of debt to fund acquisitions and developments, including the risk associated with interest
rates impacting the cost and/or availability of financing;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | risks associated with forward interest rate contracts and the effectiveness of such arrangements;
| | - |  | -------------------------------------------------------------------------------------------------



| |  |  | risks associated with downturns in the national and local economies, increases in interest rates, and volatility in the securities markets;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | risks associated with actual or threatened terrorist attacks;
| | - |  | -------------------------------------------------------------



| |  |  | costs of compliance with the Americans with Disabilities Act and other similar laws;
| | - |  | ------------------------------------------------------------------------------------



| |  |  | potential liability for uninsured losses and environmental contamination;
| | - |  | -------------------------------------------------------------------------



| |  |  | risks associated with Boston Properties, Inc.s potential failure to qualify as a REIT under the Internal Revenue Code of 1986, as amended;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | possible adverse changes in tax and environmental laws;
| | - |  | -------------------------------------------------------



| |  |  | the impact of newly adopted accounting principles on our accounting policies and on period-to-period comparisons of financial results;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------



| |  |  | risks associated with possible state and local tax audits; and
| | - |  | --------------------------------------------------------------



| |  |  | risks associated with our dependence on key personnel whose continued service is not guaranteed.
| | - |  | ------------------------------------------------------------------------------------------------

The risks set forth above are not exhaustive. Other sections of this report, including Part I, Item 1A- Risk Factors, include additional
factors that could adversely affect our business and financial performance. Moreover, we operate in a very competitive and rapidly changing environment. New risk factors emerge from time to time and it is not possible for management to predict all
such risk factors, nor can we assess the impact of all such risk factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking
statements. Given these risks and uncertainties, investors should not place undue reliance on forward-looking statements as a prediction of actual results. Investors should also refer to our quarterly reports on Form 10-Q for future periods and
current reports on Form 8-K as we file them with the SEC, and to other materials we may furnish to the public from time to time through Forms 8-K or otherwise, for a discussion of risks and uncertainties that may cause actual results, performance or
achievements to differ materially from those expressed or implied by forward-looking statements. We expressly disclaim any responsibility to update any forward-looking statements to reflect changes in underlying assumptions or factors, new
information, future events, or otherwise, and you should not rely upon these forward-looking statements after the date of this report.

Overview

Boston Properties Limited Partnership is the entity through which Boston Properties, Inc. conducts substantially all of its business and
owns (either directly or through subsidiaries) all of its assets. Our properties are concentrated in five marketsBoston, midtown Manhattan, Washington, DC, San Francisco and Princeton, NJ. We generate revenue and cash primarily by leasing our
Class A office space to our tenants. Factors we consider when we lease space include the creditworthiness of the tenant, the length of the lease, the rental rate to be paid, the costs of tenant improvements, current and anticipated operating
costs and real estate taxes, our current and anticipated vacancy, current and anticipated future demand for office space generally and general economic factors. We also generate cash through the sale of assets, which may be either non-core assets or
core assets that command premiums from real estate investors.

The impact of the current state of the economy, including rising
unemployment, constrained capital and the deleveraging of the financial system, continues to have a dampening effect on the fundamentals of our business, including overall market occupancy and rental rates. Our core strategy has always been to
operate in supply



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constrained markets with high barriers to entry and to focus on executing long-term leases with financially strong tenants. Historically, this combination
has tended to reduce our exposure to down cycles, but if major tenants in our markets come under financial pressure and do not utilize all of their space it will likely lead to increased supply through subletting or tenant defaults and a
corresponding reduction in market rental rates.

We are also not immune from the
impact of the credit crisis and global economic slowdown on our own tenants and our investments. During the third quarter of 2008, Lehman Brothers, Inc., our tenth largest tenant, filed for bankruptcy protection and we established a reserve for its
related accrued straight-line rent balance of $13.2 million. Lehman Brothers must continue to pay its rent while it occupies the space, but it may reject its lease at any time. There can be no assurance whether and for how long Lehman Brothers will
continue to occupy this space. Lehman Brothers rent contributes approximately $43.0 million per year to our revenue. In addition, during the fourth quarter of 2008, we recognized aggregate non-cash impairment charges which represented the
other-than-temporary decline in the fair values below the carrying values of certain of our investments in unconsolidated joint ventures. The joint ventures include the entities that own 540 Madison Avenue, Two Grand Central Tower, 125 West
55thStreet, the Value-Added Fund and our Eighth Avenue and 46thStreet project located in New York City.

More
generally, we remain concerned about the financial stress that our current and prospective tenants face. We believe that tenant defaults will continue and that, in general, demand for office space will decrease due to significant job losses in the
financial and professional services industries and that market rents will be under pressure for the foreseeable future. In part as a result of these market conditions, on February 6, 2009, we announced our intention to suspend construction on
our development at 250 West 55thStreet in New York City because we were not able to conclude a lease transaction with a major law firm with which
we had been negotiating over the last year. Agreement on financial terms had been reached with the firm within the last year, but recently the law firm informed us that it could not proceed on those terms thereby rendering the project economically
infeasible in todays environment. The project, a one million square foot office building, was originally scheduled for completion in 2011.

As a result of the decision to suspend construction at 250 West 55thStreet, we expect to reduce our capital commitments on the project through 2011 by approximately $450 million. After suspension of the 250 West 55thStreet project, our development program will be approximately $1.4 billion and is 75% pre-leased to tenants. As of December 31, 2008, we had invested
approximately $483.2 million in our current active developments (i.e., excluding 250 West 55thStreet) and, in addition to anticipated proceeds from
existing construction loan facilities, we expect to make additional investments of approximately $822.9 million over the next four years. Recently we have witnessed a reduction in construction materials and labor pricing, which may reduce our total
project costs, although there can be no assurance in this regard.

As of December 31, 2008, we had $241.5 million in cash and $884.4
million in availability under our Unsecured Line of Credit and anticipate funding the development projects through a combination of this existing liquidity supplemented by new construction loan facilities and/or the incurrence of additional secured
or unsecured debt. While we successfully utilized an accordion feature under our Unsecured Line of Credit to increase the lenders total commitment under the facility to $1.0 billion in July 2008, completed an offering of $747.5 million of
exchangeable senior notes in August 2008 and completed a $375.0 million financing of Embarcadero Center Four in November 2008, many of the debt capital markets that real estate companies like us frequently access, such as the unsecured bond market
and the convertible debt market, are not currently available to us on terms that we believe are economically attractive. In addition, other capital sources such as the traditional banks, pension funds and life insurance companies are lending fewer
dollars, under stricter terms and at greater costs to the borrowers. Despite these challenges, we believe the quality of our assets and our strong balance sheet align ourselves well with the lenders current investment selectivity and should
enable us to access the credit markets even in the current difficult environment. Because capital may continue to be constrained, however, we are also evaluating the appropriate amount and form of distributions for 2009. See Liquidity
and Capital Resources.



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We believe the successful lease-up and completion of our development pipeline will enhance our long-term
return on equity and earnings growth as these developments are placed in-service in 2009, 2010 and 2011. As with all aspects of our business, however, we continue to monitor the impact of the global economic slowdown and may further adjust our
development plans accordingly. We do not anticipate undertaking any new development projects in the foreseeable future without significant pre-leasing commitments from creditworthy tenants. Our focus on acquisition activity has moderated, but we
continue to actively monitor the market and seek opportunities to selectively acquire high-quality real estate at attractive returns.

Finally, in recent years, we have been an active seller of real estate assets and, although we will consider additional asset sales, we do not expect our sales volume to be comparable to that of prior years.

For descriptions of significant transactions that we entered into during 2008, see Item 1. BusinessTransactions During 2008.

Critical Accounting Policies

The
preparation of financial statements in conformity with accounting principles generally accepted in the United States of America, or GAAP, requires management to use judgment in the application of accounting policies, including making estimates and
assumptions. We base our estimates on historical experience and on various other assumptions believed to be reasonable under the circumstances. These judgments affect the reported amounts of assets and liabilities and disclosure of contingent assets
and liabilities at the dates of the financial statements and the reported amounts of revenue and expenses during the reporting periods. If our judgment or interpretation of the facts and circumstances relating to various transactions had been
different, it is possible that different accounting policies would have been applied resulting in a different presentation of our financial statements. From time to time, we evaluate our estimates and assumptions. In the event estimates or
assumptions prove to be different from actual results, adjustments are made in subsequent periods to reflect more current information. Below is a discussion of accounting policies that we consider critical in that they may require complex judgment
in their application or require estimates about matters that are inherently uncertain.

Real Estate

Upon acquisitions of real estate, we assess the fair value of acquired tangible and intangible assets, including land, buildings, tenant improvements,
above- and below-market leases, origination costs, acquired in-place leases, other identified intangible assets and assumed liabilities in accordance with Statement of Financial Accounting Standards (SFAS)
No. 141, Business Combinations and allocate the purchase price to the acquired assets and assumed liabilities, including land at appraised value and buildings at replacement cost. We assess and consider fair value based on estimated
cash flow projections that utilize discount and/or capitalization rates that we deem appropriate, as well as available market information. Estimates of future cash flows are based on a number of factors including the historical operating results,
known and anticipated trends, and market and economic conditions. The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant. We also consider an allocation of purchase price of other
acquired intangibles, including acquired in-place leases that may have a customer relationship intangible value, including (but not limited to) the nature and extent of the existing relationship with the tenants, the tenants credit quality and
expectations of lease renewals. Based on our acquisitions to date, our allocation to customer relationship intangible assets has been immaterial.

We record acquired above- and below-market leases at their fair values (using a discount rate which reflects the risks associated with the leases acquired) equal to the difference between (1) the contractual
amounts to be paid pursuant to each in-place lease and (2) managements estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and
the initial term plus the term of any below-market fixed rate renewal options for below-market leases. Other intangible assets acquired include amounts for in-place lease values that are based on our evaluation of the specific characteristics of
each tenants lease. Factors to be considered include estimates of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases.



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In estimating carrying costs, we include real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the
expected lease-up periods, depending on local market conditions. In estimating costs to execute similar leases, we consider leasing commissions, legal and other related expenses.

Real estate is stated at depreciated cost. The cost of buildings and improvements includes the purchase price of property, legal fees and other
acquisition costs. Costs directly related to the development of properties are capitalized. Capitalized development costs include interest, internal wages, property taxes, insurance, and other project costs incurred during the period of development.

Management reviews its long-lived assets used in operations for impairment following the end of each quarter and when there is an event or
change in circumstances that indicates an impairment in value. An impairment loss is recognized if the carrying amount of its assets is not recoverable and exceeds its fair value. If such impairment is present, an impairment loss is recognized based
on the excess of the carrying amount of the asset over its fair value. The evaluation of anticipated cash flows is highly subjective and is based in part on assumptions regarding future occupancy, rental rates and capital requirements that could
differ materially from actual results in future periods. Since cash flows on properties considered to be long-lived assets to be held and used as defined by SFAS No. 144, Accounting for the Impairment or Disposal of Long-Lived
Assets, (SFAS No. 144) are considered on an undiscounted basis to determine whether an asset has been impaired, our established strategy of holding properties over the long term directly decreases the likelihood of recording
an impairment loss. If our strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized and such loss could be material. If we determine that impairment has occurred, the affected assets must be
reduced to their fair value.

SFAS No. 144, requires that qualifying assets and liabilities and the results of operations that have
been sold, or otherwise qualify as held for sale, be presented as discontinued operations in all periods presented if the property operations are expected to be eliminated and we will not have significant continuing involvement following
the sale. The components of the propertys net income that is reflected as discontinued operations include the net gain (or loss) upon the disposition of the property held for sale, operating results, depreciation and interest expense (if the
property is subject to a secured loan). We generally consider assets to be held for sale when the transaction has been approved by Boston Properties, Inc.s Board of Directors, or a committee thereof, and there are no known
significant contingencies relating to the sale, such that the property sale within one year is considered probable. Following the classification of a property as held for sale, no further depreciation is recorded on the assets.

A variety of costs are incurred in the acquisition, development and leasing of properties. After the determination is made to capitalize a
cost, it is allocated to the specific component of a project that is benefited. Determination of when a development project commences and capitalization begins, and when a development project is substantially complete and held available for
occupancy and capitalization must cease involves a degree of judgment. Our capitalization policy on development properties is guided by SFAS No. 34 Capitalization of Interest Cost and SFAS No. 67 Accounting for Costs and
the Initial Rental Operations of Real Estate Projects. The costs of land and buildings under development include specifically identifiable costs. The capitalized costs include pre-construction costs necessary to the development of the
property, development costs, construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. We begin the capitalization of costs during the pre-construction period which
we define as activities that are necessary to the development of the property. We consider a construction project as substantially completed and held available for occupancy upon the completion of tenant improvements, but no later than one year from
cessation of major construction activity. We cease capitalization on the portion (1) substantially completed and (2) occupied or held available for occupancy, and we capitalize only those costs associated with the portion under
construction.



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Investments in Unconsolidated Joint Ventures

Except for ownership interests in variable interest entities, we account for our investments in joint ventures under the equity method of accounting
because we exercise significant influence over, but do not control, these entities. Our judgment with respect to our level of influence or control of an entity and whether we are the primary beneficiary of a variable interest entity involves the
consideration of various factors including the form of our ownership interest, our representation in the entitys governance, the size of our investment (including loans), estimates of future cash flows, our ability to participate in policy
making decisions and the rights of the other investors to participate in the decision making process and to replace us as manager and/or liquidate the venture, if applicable. Our assessment of our influence or control over an entity affects the
presentation of these investments in our consolidated financial statements.

These investments are recorded initially at cost, as
Investments in Unconsolidated Joint Ventures, and subsequently adjusted for equity in earnings and cash contributions and distributions. Any difference between the carrying amount of these investments on our balance sheet and the underlying equity
in net assets is amortized as an adjustment to equity in earnings of unconsolidated joint ventures over the life of the related asset. Under the equity method of accounting, our net equity is reflected within the Consolidated Balance Sheets, and our
share of net income or loss from the joint ventures is included within the Consolidated Statements of Operations. The joint venture agreements may designate different percentage allocations among investors for profits and losses, however, our
recognition of joint venture income or loss generally follows the joint ventures distribution priorities, which may change upon the achievement of certain investment return thresholds. For ownership interests in variable interest entities, we
consolidate those in which we are the primary beneficiary. Our investments in unconsolidated joint ventures are reviewed for impairment periodically and we record impairment charges when events or circumstances change indicating that a decline in
the fair values below the carrying values has occurred and such decline is other-than-temporary. The ultimate realization of our investment in unconsolidated joint ventures is dependent on a number of factors, including the performance of each
investment and market conditions. We will record an impairment charge if we determine that a decline in the value of an investment in an unconsolidated joint venture is other than temporary.

During December 2008, we recognized non-cash impairment charges which represented the other-than-temporary decline in the fair values below the carrying
values of certain of our investments in unconsolidated joint ventures. In accordance with Accounting Principles Board Opinion No. 18 The Equity Method of Accounting for Investments in Common Stock (APB No. 18), a loss in value of an
investment under the equity method of accounting, which is other than a temporary decline, must be recognized. Unlike SFAS No. 144, potential impairments under APB No. 18 result from fair values derived based on discounted cash flows and other
valuation techniques which are more sensitive to current market conditions. As a result, we recognized non-cash impairment charges of approximately $31.9 million, $74.3 million, $45.1 million and $13.8 million on our investments in 540 Madison
Avenue, Two Grand Central Tower, 125 West 55th Street and the Value-Added Fund, respectively.

During December 2008, an unconsolidated
joint venture in which we have a 50% interest suspended development activity on its Eighth Avenue and 46th Street project located in New York City. The proposed project was comprised of an assemblage of land parcels and air-rights, including
contracts to acquire land parcels and air-rights, on which the joint venture was to construct a Class A office property. As a result, we recognized a charge totaling approximately $23.2 million (including $2.9 million of non-cash impairment
charges in accordance with APB No. 18), which represented our share of land and air-rights impairment losses, forfeited contract deposits and previously incurred planning and pre-development costs.

The combined summarized financial information of the unconsolidated joint ventures is disclosed in Note 5 of the Consolidated Financial Statements.



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Revenue Recognition

Contractual rental revenue is reported on a straight-line basis over the terms of our respective leases. In accordance with SFAS No. 141, we recognize rental revenue of acquired in-place above- and
below-market leases at their fair values over the terms of the respective leases. Accrued rental income as reported on the Consolidated Balance Sheets represents rental income recognized in excess of rent payments actually received
pursuant to the terms of the individual lease agreements.

For the year ended December 31, 2008, we recorded $5.4 million of rental
revenue representing the adjustments of rents from above and below market leases in accordance with SFAS No. 141. For the year ended December 31, 2008, the impact of the straight-line rent adjustment was
approximately a $24.5 million increase in rental revenue. The straight-line adjustment for the year included an approximately $21.0 million decrease due to the establishment of reserves for the full amount of the accrued straight-line rent balances
associated with our leases in New York City with Lehman Brothers, Inc. and the law firm of Heller Ehrman LLP. Amounts exclude SFAS No. 141 and straight-line income from unconsolidated joint ventures, which is disclosed in Note 5 of the
Consolidated Financial Statements.

Our leasing strategy is generally to secure creditworthy tenants that meet our underwriting guidelines.
Furthermore, following the initiation of a lease, we continue to actively monitor the tenants creditworthiness to ensure that all tenant related assets are recorded at their realizable value. When assessing tenant credit quality, we:



| |  |  | review relevant financial information, including:
| | - |  | -------------------------------------------------



| |  |  | financial ratios;
| | - |  | -----------------



| |  |  | net worth;
| | - |  | ----------



| |  |  | revenue;
| | - |  | --------



| |  |  | cash flows;
| | - |  | -----------



| |  |  | leverage: and
| | - |  | -------------



| |  |  | liquidity;
| | - |  | ----------



| |  |  | evaluate the depth and experience of the tenants management team; and
| | - |  | ----------------------------------------------------------------------



| |  |  | assess the strength/growth of the tenants industry.
| | - |  | ----------------------------------------------------

As a result of the underwriting process, tenants are then categorized into one of three categories:



| | (1) | low risk tenants;
| | --- | -----------------



| | (2) | the tenants credit is such that we require collateral, in which case we:
| | --- | -------------------------------------------------------------------------



| |  |  | require a security deposit; and/or
| | - |  | ----------------------------------



| |  |  | reduce upfront tenant improvement investments; or
| | - |  | -------------------------------------------------



| | (3) | the tenants credit is below our acceptable parameters.
| | --- | -------------------------------------------------------

We consistently monitor the credit quality of our tenant base. We provide an allowance for doubtful accounts arising from estimated losses that could result from the tenants inability to make required current rent payments and an
allowance against accrued rental income for future potential losses that we deem to be unrecoverable over the term of the lease.

Tenant
receivables are assigned a credit rating of 1 through 4. A rating of 1 represents the highest possible rating and no allowance is recorded. A rating of 4 represents the lowest credit rating, in which case we record a full reserve against the
receivable balance. Among the factors considered in determining the credit rating include:



| |  |  | payment history;
| | - |  | ----------------



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| |  |  | credit status and change in status (credit ratings for public companies are used as a primary metric);
| | - |  | ------------------------------------------------------------------------------------------------------



| |  |  | change in tenant space needs (i.e., expansion/downsize);
| | - |  | --------------------------------------------------------



| |  |  | tenant financial performance;
| | - |  | -----------------------------



| |  |  | economic conditions in a specific geographic region; and
| | - |  | --------------------------------------------------------



| |  |  | industry specific credit considerations.
| | - |  | ----------------------------------------

If our estimates of collectibility differ from the cash received, then the timing and amount of our reported revenue could be impacted. The average remaining term of our in-place tenant leases, including unconsolidated joint ventures, was
approximately 7.2 years as of December 31, 2008. The credit risk is mitigated by the high quality of our existing tenant base, reviews of prospective tenants risk profiles prior to lease execution and consistent monitoring of our
portfolio to identify potential problem tenants.

Recoveries from tenants, consisting of amounts due from tenants for common area
maintenance, real estate taxes and other recoverable costs, are recognized as revenue in the period during which the expenses are incurred. Tenant reimbursements are recognized and presented in accordance with Emerging Issues Task Force, or EITF,
Issue 99-19 Reporting Revenue Gross as a Principal versus Net as an Agent, or (Issue 99-19). Issue 99-19 requires that these reimbursements be recorded on a gross basis, as we are generally the primary obligor with respect to
purchasing goods and services from third-party suppliers, have discretion in selecting the supplier and have credit risk. We also receive reimbursement of payroll and payroll related costs from third parties which we reflect on a net basis in
accordance with Issue 99-19.

Our hotel revenues are derived from room rentals and other sources such as charges to guests for
long-distance telephone service, fax machine use, movie and vending commissions, meeting and banquet room revenue and laundry services. Hotel revenues are recognized as earned.

We receive management and development fees from third parties. Management fees are recorded and earned based on a percentage of collected rents at the
properties under management, and not on a straight-line basis, because such fees are contingent upon the collection of rents. We review each development agreement and record development fees as earned depending on the risk associated with each
project. Profit on development fees earned from joint venture projects is recognized as revenue to the extent of the third party partners ownership interest.

Gains on sales of real estate are recognized pursuant to the provisions of SFAS No. 66, Accounting for Sales of Real Estate. The specific timing of a sale is measured against various criteria in
SFAS No. 66 related to the terms of the transaction and any continuing involvement in the form of management or financial assistance associated with the properties. If the sales criteria are not met, we defer gain recognition and account for
the continued operations of the property by applying the finance, installment or cost recovery methods, as appropriate, until the sales criteria are met.

Depreciation and Amortization

We compute depreciation and amortization on our properties using the straight-line
method based on estimated useful asset lives. In accordance with SFAS No. 141, we allocate the acquisition cost of real estate to land, building, tenant improvements, acquired above- and below-market leases, origination
costs and acquired in-place leases based on an assessment of their fair value and depreciate or amortize these assets over their useful lives. The amortization of acquired above- and below-market leases and acquired in-place
leases is recorded as an adjustment to revenue and depreciation and amortization, respectively, in the Consolidated Statements of Operations.



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Fair Value of Financial Instruments

For purposes of disclosure, we calculate the fair value of our mortgage notes payable and unsecured senior notes. We discount the spread between the
future contractual interest payments and hypothetical future interest payments on our mortgage debt and unsecured notes based on a current market rate. In determining the current market rate, we add our estimate of a market spread to the quoted
yields on federal government treasury securities with similar maturity dates to our own debt. Because our valuations of our financial instruments are based on these types of estimates, the actual fair value of our financial instruments may differ
materially if our estimates do not prove to be accurate.

Derivative Instruments and Hedging Activities

Derivative instruments and hedging activities require management to make judgments on the nature of its derivatives and their effectiveness as hedges.
These judgments determine if the changes in fair value of the derivative instruments are reported in the Consolidated Statements of Operations as a component of net income or as a component of comprehensive income and as a component of equity on the
Consolidated Balance Sheets. While management believes its judgments are reasonable, a change in a derivatives effectiveness as a hedge could materially affect expenses, net income and equity. We recognized net derivative losses of
approximately $17.0 million for the year ended December 31, 2008 (See Note 6 of the Consolidated Financial Statements).

Results of Operations

The following discussion is based on our Consolidated Financial Statements for the years ended December 31, 2008, 2007 and 2006.

At December 31, 2008, 2007 and 2006, we owned or had interests in a portfolio of 147, 139 and 131 properties, respectively (the
Total Property Portfolio). As a result of changes within our Total Property Portfolio, the financial data presented below shows significant changes in revenue and expenses from period-to-period. Accordingly, we do not believe that our
period-to-period financial data with respect to the Total Property Portfolio are necessarily meaningful. Therefore, the comparisons of operating results for the years ended 2008, 2007 and 2006 show separately the changes attributable to the
properties that were owned by us throughout each period compared (the Same Property Portfolio) and the changes attributable to the properties included in Properties Acquired, Sold, Repositioned and Placed-in Service.

In our analysis of operating results, particularly to make comparisons of net operating income between periods meaningful, it is important to provide
information for properties that were in-service and owned by us throughout each period presented. We refer to properties acquired or placed in-service prior to the beginning of the earliest period presented and owned by us through the end of the
latest period presented as our Same Property Portfolio. The Same Property Portfolio therefore excludes properties placed in-service, acquired or repositioned after the beginning of the earliest period presented or disposed of prior to the end of the
latest period presented.

Net operating income, or NOI, is a non-GAAP financial measure equal to net income available to common
unitholders, the most directly comparable GAAP financial measure, plus losses from early extinguishments of debt, losses from investments in securities, net derivative losses, depreciation and amortization, interest expense, general and
administrative expense, less gains on sales of real estate from discontinued operations, income from discontinued operations, gains on sales of real estate and other assets, income (loss) from unconsolidated joint ventures, minority interests in
property partnerships, interest and other income and development and management services revenue. We use NOI internally as a performance measure and believe NOI provides useful information to investors regarding our financial condition and results
of operations because it reflects only those income and expense items that are incurred at the property level. Therefore, we believe NOI is a useful measure for evaluating the operating performance of our real estate assets.



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Our management also uses NOI to evaluate regional property level performance and to make decisions about
resource allocations. Further, we believe NOI is useful to investors as a performance measure because, when compared across periods, NOI reflects the impact on operations from trends in occupancy rates, rental rates, operating costs and acquisition
and development activity on an unleveraged basis, providing perspective not immediately apparent from net income. NOI excludes certain components from net income in order to provide results that are more closely related to a propertys results
of operations. For example, interest expense is not necessarily linked to the operating performance of a real estate asset and is often incurred at the corporate level as opposed to the property level. In addition, depreciation and amortization,
because of historical cost accounting and useful life estimates, may distort operating performance at the property level. NOI presented by us may not be comparable to NOI reported by other REITs that define NOI differently. We believe that in order
to facilitate a clear understanding of our operating results, NOI should be examined in conjunction with net income as presented in our consolidated financial statements. NOI should not be considered as an alternative to net income as an indication
of our performance or to cash flows as a measure of liquidity or ability to make distributions.

Comparison of the year ended December 31, 2008
to the year ended December 31, 2007

The table below shows selected
operating information for the Same Property Portfolio and the Total Property Portfolio. The Same Property Portfolio consists of 115 properties, including properties acquired or placed in-service on or prior to January 1, 2007 and owned through
December 31, 2008, totaling approximately 28.9 million net rentable square feet of space (excluding square feet of structured parking). The Total Property Portfolio includes the effects of the other properties either placed in-service,
acquired or repositioned after January 1, 2007 or disposed of on or prior to December 31, 2008. Properties Placed In-Service includes our 505 9thStreet joint venture project. In connection with partially placing this property in-service, we consolidated the joint venture entity that owns the property as of October 1, 2007 due to the involvement we
have in the venture once the property is operational. The Same Property Portfolio includes our Cambridge Center Marriott hotel property, but does not include the Long Wharf Marriott hotel property, which was sold on March 23, 2007. This table
includes a reconciliation from the Same Property Portfolio to the Total Property Portfolio by also providing information for the year ended December 31, 2008 and 2007 with respect to the properties which were acquired, placed in-service,
repositioned or sold.



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|                                                                 |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   |           |   |  |   |           |   |  |   |            |   |  |           |   
|---------------------------------------------------------------- |  | ----------------------- | --------- | - | -------------- | - | ------------------- |  | -------------------------- | ------- | ---------------------- |  | ------------------------ | ------- | ---- |  | ---- | -- |  | ---- | ------ | ---- | - | -------- | - | ---- | - | ------ |  | ---- | ------ |  | ---- | ----- |  | ------------------- | - |  | ------- | - |  | - | --------- | - |  | - | --------- | - |  | - | ---------- | - |  | --------- | --
|                                                                 |  | Same Property Portfolio |           |   | PropertiesSold |   | PropertiesAcquired  |  | PropertiesPlacedIn-Service |         | PropertiesRepositioned |  | Total Property Portfolio |        
|(dollars in thousands)                                           |  | 2008                    |           |   | 2007           |   | Increase/(Decrease) |  |                            | %Change |                        |  | 2008                     |         | 2007 |  | 2008 |    |  | 2007 |        | 2008 |   | 2007     |   | 2008 |   | 2007   |  | 2008 |        |  | 2007 |       |  | Increase/(Decrease) |   |  | %Change |  
|Rental Revenue:                                                  |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   |           |   |  |   |           |   |  |   |            |   |  |           |   
|Rental Revenue                                                   |  | $                       | 1,326,099 |   |                | $ | 1,288,085           |  | $                          | 38,014  |                        |  |                          | 2.95    | %    |  | $    | 90 |  | $    | 23,177 |      | $ | 20,137   |   |      | $ | 12,138 |  | $    | 43,283 |  | $    | 3,837 |  | $                   |  |  | $       |  |  | $ | 1,389,609 |   |  | $ | 1,327,237 |   |  | $ | 62,372     |   |  | 4.70      | % 
|Termination Income                                               |  |                         | 12,443    |   |                |   | 6,882               |  |                            | 5,561   |                        |  |                          | 80.80   | %    |  |      |   |  |      |       |      |   |         |   |      |   | 100    |  |      |       |  |      |      |  |                     |  |  |         |  |  |   | 12,443    |   |  |   | 6,982     |   |  |   | 5,461      |   |  | 78.22     | % 
|                                                                 |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   |           |   |  |   |           |   |  |   |            |   |  |           |   
|Total Rental Revenue                                             |  |                         | 1,338,542 |   |                |   | 1,294,967           |  |                            | 43,575  |                        |  |                          | 3.36    | %    |  |      | 90 |  |      | 23,177 |      |   | 20,137   |   |      |   | 12,238 |  |      | 43,283 |  |      | 3,837 |  |                     |  |  |         |  |  |   | 1,402,052 |   |  |   | 1,334,219 |   |  |   | 67,833     |   |  | 5.08      | % 
|                                                                 |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   |           |   |  |   |           |   |  |   |            |   |  |           |   
|Real Estate Operating Expenses                                   |  |                         | 471,040   |   |                |   | 444,364             |  |                            | 26,676  |                        |  |                          | 6.00    | %    |  |      | 46 |  |      | 6,781  |      |   | 6,406    |   |      |   | 3,499  |  |      | 10,538 |  |      | 1,196 |  |                     |  |  |         |  |  |   | 488,030   |   |  |   | 455,840   |   |  |   | 32,190     |   |  | 7.06      | % 
|                                                                 |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   |           |   |  |   |           |   |  |   |            |   |  |           |   
|Net Operating Income, excluding hotel                            |  |                         | 867,502   |   |                |   | 850,603             |  |                            | 16,899  |                        |  |                          | 1.99    | %    |  |      | 44 |  |      | 16,396 |      |   | 13,731   |   |      |   | 8,739  |  |      | 32,745 |  |      | 2,641 |  |                     |  |  |         |  |  |   | 914,022   |   |  |   | 878,379   |   |  |   | 35,643     |   |  | 4.06      | % 
|                                                                 |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   |           |   |  |   |           |   |  |   |            |   |  |           |   
|Hotel Net Operating Income (1)                                   |  |                         | 9,362     |   |                |   | 10,046              |  |                            | (684    | )                      |  |                          | (6.80   | )%   |  |      |   |  |      |       |      |   |         |   |      |   |       |  |      |       |  |      |      |  |                     |  |  |         |  |  |   | 9,362     |   |  |   | 10,046    |   |  |   | (684       | ) |  | (6.80     | )%
|                                                                 |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   |           |   |  |   |           |   |  |   |            |   |  |           |   
|Consolidated Net OperatingIncome (1)                             |  |                         | 876,864   |   |                |   | 860,649             |  |                            | 16,215  |                        |  |                          | 1.88    | %    |  |      | 44 |  |      | 16,396 |      |   | 13,731   |   |      |   | 8,739  |  |      | 32,745 |  |      | 2,641 |  |                     |  |  |         |  |  |   | 923,384   |   |  |   | 888,425   |   |  |   | 34,959     |   |  | 3.93      | % 
|                                                                 |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   |           |   |  |   |           |   |  |   |            |   |  |           |   
|Other Revenue:                                                   |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   |           |   |  |   |           |   |  |   |            |   |  |           |   
|Development and Management Services                              |  |                         |          |   |                |   |                    |  |                            |        |                        |  |                          |        |      |  |      |   |  |      |       |      |   |         |   |      |   |       |  |      |       |  |      |      |  |                     |  |  |         |  |  |   | 30,518    |   |  |   | 20,553    |   |  |   | 9,965      |   |  | 48.48     | % 
|Interest and Other                                               |  |                         |          |   |                |   |                    |  |                            |        |                        |  |                          |        |      |  |      |   |  |      |       |      |   |         |   |      |   |       |  |      |       |  |      |      |  |                     |  |  |         |  |  |   | 18,958    |   |  |   | 89,706    |   |  |   | (70,748    | ) |  | (78.87    | )%
|                                                                 |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   |           |   |  |   |           |   |  |   |            |   |  |           |   
|Total Other Revenue                                              |  |                         |          |   |                |   |                    |  |                            |        |                        |  |                          |        |      |  |      |   |  |      |       |      |   |         |   |      |   |       |  |      |       |  |      |      |  |                     |  |  |         |  |  |   | 49,476    |   |  |   | 110,259   |   |  |   | (60,783    | ) |  | (55.13    | )%
|Other Expenses:                                                  |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   |           |   |  |   |           |   |  |   |            |   |  |           |   
|General and administrative expense                               |  |                         |          |   |                |   |                    |  |                            |        |                        |  |                          |        |      |  |      |   |  |      |       |      |   |         |   |      |   |       |  |      |       |  |      |      |  |                     |  |  |         |  |  |   | 72,365    |   |  |   | 69,882    |   |  |   | 2,483      |   |  | 3.55      | % 
|Interest Expense                                                 |  |                         |          |   |                |   |                    |  |                            |        |                        |  |                          |        |      |  |      |   |  |      |       |      |   |         |   |      |   |       |  |      |       |  |      |      |  |                     |  |  |         |  |  |   | 271,972   |   |  |   | 285,887   |   |  |   | (13,915    | ) |  | (4.87     | )%
|Depreciation and amortization                                    |  |                         | 276,427   |   |                |   | 266,487             |  |                            | 9,940   |                        |  |                          | 3.73    | %    |  |      |   |  |      | 2,767  |      |   | 10,527   |   |      |   | 8,357  |  |      | 9,168  |  |      | 638   |  |                     |  |  |         |  |  |   | 296,122   |   |  |   | 278,249   |   |  |   | 17,873     |   |  | 6.42      | % 
|Losses from investments in securities                            |  |                         |          |   |                |   |                    |  |                            |        |                        |  |                          |        |      |  |      |   |  |      |       |      |   |         |   |      |   |       |  |      |       |  |      |      |  |                     |  |  |         |  |  |   | 4,604     |   |  |   |          |   |  |   | 4,604      |   |  | 100.00    | % 
|Net derivative losses                                            |  |                         |          |   |                |   |                    |  |                            |        |                        |  |                          |        |      |  |      |   |  |      |       |      |   |         |   |      |   |       |  |      |       |  |      |      |  |                     |  |  |         |  |  |   | 17,021    |   |  |   |          |   |  |   | 17,021     |   |  | 100.00    | % 
|Loss from early extinguishments of debt                          |  |                         |          |   |                |   |                    |  |                            |        |                        |  |                          |        |      |  |      |   |  |      |       |      |   |         |   |      |   |       |  |      |       |  |      |      |  |                     |  |  |         |  |  |   |          |   |  |   | 3,417     |   |  |   | (3,417     | ) |  | (100.00   | )%
|                                                                 |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   |           |   |  |   |           |   |  |   |            |   |  |           |   
|Total Other Expenses                                             |  |                         | 276,427   |   |                |   | 266,487             |  |                            | 9,940   |                        |  |                          | 3.73    | %    |  |      |   |  |      | 2,767  |      |   | 10,527   |   |      |   | 8,357  |  |      | 9,168  |  |      | 638   |  |                     |  |  |         |  |  |   | 662,084   |   |  |   | 637,435   |   |  |   | 24,649     |   |  | 3.87      | % 
|                                                                 |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   |           |   |  |   |           |   |  |   |            |   |  |           |   
|Income before minority interests                                 |  | $                       | 600,437   |   |                | $ | 594,162             |  | $                          | 6,275   |                        |  |                          | 1.06    | %    |  | $    | 44 |  | $    | 13,629 |      | $ | 3,204    |   |      | $ | 382    |  | $    | 23,577 |  | $    | 2,003 |  | $                   |  |  | $       |  |  | $ | 310,776   |   |  | $ | 361,249   |   |  | $ | (50,473    | ) |  | (13.97    | )%
|Income (loss) from unconsolidated joint ventures                 |  | $                       | (33,794   | ) |                | $ | 20,428              |  | $                          | (54,222 | )                      |  |                          | (265.43 | )%   |  | $    |   |  | $    |       |      | $ | (148,224 | ) |      | $ |       |  | $    |       |  | $    |      |  | $                   |  |  | $       |  |  |   | (182,018  | ) |  |   | 20,428    |   |  |   | (202,446   | ) |  | (991.02   | )%
|Income from discontinued operations                              |  | $                       |          |   |                | $ |                    |  | $                          |        |                        |  | $                        |        |      |  | $    |   |  | $    | 7,274  |      | $ |         |   |      | $ |       |  | $    |       |  | $    |      |  | $                   |  |  | $       |  |  |   |          |   |  |   | 7,274     |   |  |   | (7,274     | ) |  | (100.00   | )%
|Minority interests in property partnerships                      |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   | (1,997    | ) |  |   | (84       | ) |  |   | (1,913     | ) |  | (2,277.38 | )%
|Gains on sales of real estate                                    |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   | 33,340    |   |  |   | 957,406   |   |  |   | (924,066   | ) |  | (96.52    | )%
|Gains on sales of real estate from discontinued operations       |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   |          |   |  |   | 266,817   |   |  |   | (266,817   | ) |  | (100.00   | )%
|Preferred distributions and allocation of undistributed earnings |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   | (4,226    | ) |  |   | (15,014   | ) |  |   | (10,788    | ) |  | (71.85    | )%
|                                                                 |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   |           |   |  |   |           |   |  |   |            |   |  |           |   
|Net Income available to common unitholders                       |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  | $ | 155,875   |   |  | $ | 1,598,076 |   |  | $ | (1,442,201 | ) |  | (90.25    | )%
|                                                                 |  |                         |           |   |                |   |                     |  |                            |         |                        |  |                          |         |      |  |      |    |  |      |        |      |   |          |   |      |   |        |  |      |        |  |      |       |  |                     |   |  |         |   |  |   |           |   |  |   |           |   |  |   |            |   |  |           |   



|(1) | For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 52. Hotel Net Operating Income for the years ended December 31,
2008 and 2007 is comprised of Hotel Revenue of $36,872 and $37,811, respectively, less Hotel Expenses of $27,510 and $27,765, respectively, per the Consolidated Income Statement.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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Rental Revenue

The increase of approximately $62.4 million in the Total Property Portfolio Rental Revenue is comprised of increases and decreases within four categories that comprise our Total Property Portfolio. Rental revenue from
the Same Property Portfolio increased approximately $38.0 million, Properties Sold decreased approximately $23.1 million, Properties Acquired increased approximately $8.0 million and Properties Placed In-Service increased approximately $39.5 million
for the year ended December 31, 2008 compared to the year ended December 31, 2007.

Rental revenue from the Same Property
Portfolio increased approximately $38.0 million for the year ended December 31, 2008 compared to 2007. Included in the Same Property Portfolio rental revenue is an overall increase in contractual rental revenue of approximately $49.2 million,
offset by a decrease of approximately $30.9 million in straight-line rents. An aggregate of $21.0 million of the decrease in straight-line rent is due to the establishment of reserves for the full amount of the accrued straight-line rent balances
associated with our leases in New York City with Lehman Brothers, Inc. and the law firm of Heller Ehrman LLP. Approximately $17.3 million of the increase from the Same Property Portfolio was due to an increase in recoveries from tenants which
relates to the increase in operating expenses. Approximately $2.4 million of the increase from the Same Property Portfolio was due to an increase in parking and other income. We expect the aggregate impact of straight-line rents for fiscal 2009 to
be between $28 million and $30 million. Lehman Brothers, Inc. contributes approximately $43.0 million per year to our rental revenue. In the event that Lehman Brothers, Inc. rejects its lease and vacates its space, we will lose this revenue until we
are able to lease this space to a new tenant.

The increase in rental revenue from
Properties Placed In-Service relates to fully placing in-service our 505 9thStreet development project in the first quarter of 2008 and our 77
CityPoint and South of Market development projects during the fourth quarter of 2008. In addition, we partially placed in-service our One Preserve Parkway development project during the second quarter of 2008. Rental Revenue from Properties Placed
In-Service increased approximately $39.5 million, as detailed below:



|                     |  |                        |  |                                              |        |        |   |       |  |   |       
|-------------------- |  | ---------------------- |  | -------------------------------------------- | ------ | ------ | - | ----- |  | - | ------
|Property             |  | Date Placed In-Service |  | Rental Revenuefor the year ended December 31
|                     |  | 2008                   |  | 2007                                         |        | Change
|                     |  |                        |  | (in thousands)                              
|505 9th Street       |  | First Quarter, 2008    |  | $                                            | 20,090 |        | $ | 3,837 |  | $ | 16,253
|South of Market      |  | Fourth Quarter, 2008   |  |                                              | 20,010 |        |   |      |  |   | 20,010
|77 CityPoint         |  | Fourth Quarter, 2008   |  |                                              | 2,098  |        |   |      |  |   | 2,098 
|One Preserve Parkway |  | Second Quarter, 2008   |  |                                              | 1,085  |        |   |      |  |   | 1,085 
|                     |  |                        |  |                                              |        |        |   |       |  |   |       
|Total                |  |                        |  | $                                            | 43,283 |        | $ | 3,837 |  | $ | 39,446
|                     |  |                        |  |                                              |        |        |   |       |  |   |       

The acquisitions of Kingstowne Towne Center, North First Business Park, 103 Fourth Avenue,
6601 & 6605 Springfield Center Drive and Springfield Metro Center during 2007 and 635 Massachusetts Avenue during 2008, resulted in an increase of revenue from Properties Acquired. Rental Revenue resulting from Properties Acquired increased
approximately $8.0 million, as detailed below:



|                                     |  |                    |  |                                              |        |        |   |        |  |   |       |  
|------------------------------------ |  | ------------------ |  | -------------------------------------------- | ------ | ------ | - | ------ |  | - | ----- | -
|Property                             |  | Date Acquired      |  | Rental Revenuefor the year ended December 31 |       
|                                     |  | 2008               |  | 2007                                         |        | Change |  
|                                     |  |                    |  | (in thousands)                               |       
|Kingstowne Towne Center              |  | March 30, 2007     |  | $                                            | 14,584 |        | $ | 10,631 |  | $ | 3,953 |  
|North First Business Park            |  | December 13, 2007  |  |                                              | 2,571  |        |   | 102    |  |   | 2,469 |  
|635 Massachusetts Avenue             |  | September 26, 2008 |  |                                              | 1,828  |        |   |       |  |   | 1,828 |  
|103 Fourth Avenue                    |  | January 29, 2007   |  |                                              | 795    |        |   | 720    |  |   | 75    |  
|6601 & 6605 Springfield Center Drive |  | January 18, 2007   |  |                                              | 359    |        |   | 685    |  |   | (326  | )
|Springfield Metro Center             |  | April 11, 2007     |  |                                              |       |        |   |       |  |   |      |  
|                                     |  |                    |  |                                              |        |        |   |        |  |   |       |  
|Total                                |  |                    |  | $                                            | 20,137 |        | $ | 12,138 |  | $ | 7,999 |  
|                                     |  |                    |  |                                              |        |        |   |        |  |   |       |  



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A decrease of approximately $23.1 million in the Total Property Portfolio rental revenue was due to the
sales of Democracy Center in August 2007 and 5 Times Square in February 2007 and the transfer of Mountain View Research Park and Mountain View Technology Park to the Value-Added Fund in January 2008, as detailed below. These properties have not been
classified as discontinued operations due to our continuing involvement as the property manager for each property and our continued ownership interest in Mountain View Research Park and Mountain View Technology Park:



|                         |  |                   |  |                                              |    |        |   |        |  |   |         |  
|------------------------ |  | ----------------- |  | -------------------------------------------- | -- | ------ | - | ------ |  | - | ------- | -
|Property                 |  | Date Sold         |  | Rental Revenuefor the year ended December 31 |   
|                         |  | 2008              |  | 2007                                         |    | Change |  
|                         |  |                   |  | (in thousands)                               |   
|Mountain View Properties |  | January 7, 2008   |  | $                                            | 90 |        | $ | 1,275  |  | $ | (1,185  | )
|Democracy Center         |  | August 7, 2007    |  |                                              |   |        |   | 12,016 |  |   | (12,016 | )
|5 Times Square           |  | February 15, 2007 |  |                                              |   |        |   | 9,886  |  |   | (9,886  | )
|                         |  |                   |  |                                              |    |        |   |        |  |   |         |  
|Total                    |  |                   |  | $                                            | 90 |        | $ | 23,177 |  | $ | (23,087 | )
|                         |  |                   |  |                                              |    |        |   |        |  |   |         |  

Termination Income

Termination income for the year ended December 31, 2008 totaling approximately $12.4 million was related to multiple tenants across the Total Property Portfolio that terminated their leases, including $7.5
million of termination income related to a termination agreement with Heller Ehrman LLP. This compared to termination income of $7.0 million for the year ended December 31, 2007.

Real Estate Operating Expenses

The $32.2 million increase in property operating expenses
(real estate taxes, utilities, insurance, repairs and maintenance, cleaning and other property-related expenses) in the Total Property Portfolio is comprised of increases and decreases within four categories that comprise our Total Property
Portfolio. Operating expenses for the Same Property Portfolio increased approximately $26.7 million, Properties Sold decreased approximately $6.7 million, Properties Acquired increased approximately $2.9 million and Properties Placed In-Service
increased approximately $9.3 million.

Operating expenses from the Same Property Portfolio increased approximately $26.7 million for the
year ended December 31, 2008 compared to 2007. Included in Same Property Portfolio operating expenses is an increase in utility expenses of approximately $5.7 million, which represents an increase of approximately 7% over the prior year. In
addition, real estate taxes increased approximately $14.2 million due to increased real estate tax assessments, which represents an increase of approximately 8%. The remaining increase of approximately $6.8 million is related to repairs and
maintenance and other property-related expenses.

The acquisitions of Kingstowne Towne Center, North First Business Park, 103 Fourth
Avenue, 6601 & 6605 Springfield Center Drive and Springfield Metro Center during 2007, and 635 Massachusetts Avenue during 2008, increased operating expenses from Properties Acquired by approximately $2.9 million for the year ended
December 31, 2008 as detailed below:



|                                     |  |                    |  |                                                             |       |        |   |       |  |   |      
|------------------------------------ |  | ------------------ |  | ----------------------------------------------------------- | ----- | ------ | - | ----- |  | - | -----
|Property                             |  | Date Acquired      |  | Real Estate Operating Expensefor the year ended December 31
|                                     |  | 2008               |  | 2007                                                        |       | Change
|Kingstowne Towne Center              |  | March 30, 2007     |  | $                                                           | 3,808 |        | $ | 2,591 |  | $ | 1,217
|North First Business Park            |  | December 13, 2007  |  |                                                             | 1,138 |        |   | 46    |  |   | 1,092
|103 Fourth Avenue                    |  | January 29, 2007   |  |                                                             | 759   |        |   | 606   |  |   | 153  
|635 Massachusetts Avenue             |  | September 26, 2008 |  |                                                             | 274   |        |   |      |  |   | 274  
|6601 & 6605 Springfield Center Drive |  | January 18, 2007   |  |                                                             | 239   |        |   | 167   |  |   | 72   
|Springfield Metro Center             |  | April 11, 2007     |  |                                                             | 188   |        |   | 89    |  |   | 99   
|                                     |  |                    |  |                                                             |       |        |   |       |  |   |      
|Total                                |  |                    |  | $                                                           | 6,406 |        | $ | 3,499 |  | $ | 2,907
|                                     |  |                    |  |                                                             |       |        |   |       |  |   |      



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The increase in operating expenses from Properties
Placed In-Service relates to fully placing in-service our 505 9thStreet development project in the first quarter of 2008 and our 77 CityPoint and
South of Market development projects during the fourth quarter of 2008. In addition, we partially placed in-service our One Preserve Parkway development project during the second quarter of 2008. Operating expenses from Properties Placed In-Service
increased approximately $9.3 million, as detailed below:



|                     |  |                        |  |                                                              |        |        |   |       |  |   |      
|-------------------- |  | ---------------------- |  | ------------------------------------------------------------ | ------ | ------ | - | ----- |  | - | -----
|Property             |  | Date Placed In-Service |  | Real Estate Operating Expensesfor the year ended December 31
|                     |  | 2008                   |  | 2007                                                         |        | Change
|                     |  |                        |  | (in thousands)                                              
|505 9th Street       |  | First Quarter, 2008    |  | $                                                            | 5,672  |        | $ | 1,196 |  | $ | 4,476
|South of Market      |  | Fourth Quarter, 2008   |  |                                                              | 3,466  |        |   |      |  |   | 3,466
|77 CityPoint         |  | Fourth Quarter, 2008   |  |                                                              | 883    |        |   |      |  |   | 883  
|One Preserve Parkway |  | Second Quarter, 2008   |  |                                                              | 517    |        |   |      |  |   | 517  
|                     |  |                        |  |                                                              |        |        |   |       |  |   |      
|Total                |  |                        |  | $                                                            | 10,538 |        | $ | 1,196 |  | $ | 9,342
|                     |  |                        |  |                                                              |        |        |   |       |  |   |      

A decrease of approximately $6.7 million in the Total Property Portfolio operating expenses was
due to the sales of Democracy Center in August 2007 and 5 Times Square in February 2007 and the transfer of Mountain View Research Park and Mountain View Technology Park to the Value-Added Fund in January 2008, as detailed below. These properties
have not been classified as discontinued operations due to our continuing involvement as the property manager for each property and our continued ownership interest in Mountain View Research Park and Mountain View Technology Park.



|                         |  |                   |  |                                                              |    |        |   |       |  |   |        |  
|------------------------ |  | ----------------- |  | ------------------------------------------------------------ | -- | ------ | - | ----- |  | - | ------ | -
|Property                 |  | Date Sold         |  | Real Estate Operating Expensesfor the year ended December 31 |   
|                         |  | 2008              |  | 2007                                                         |    | Change |  
|                         |  |                   |  | (in thousands)                                               |   
|Mountain View Properties |  | January 7, 2008   |  | $                                                            | 46 |        | $ | 412   |  | $ | (366   | )
|Democracy Center         |  | August 7, 2007    |  |                                                              |   |        |   | 4,204 |  |   | (4,204 | )
|5 Times Square           |  | February 15, 2007 |  |                                                              |   |        |   | 2,165 |  |   | (2,165 | )
|                         |  |                   |  |                                                              |    |        |   |       |  |   |        |  
|Total                    |  |                   |  | $                                                            | 46 |        | $ | 6,781 |  | $ | (6,735 | )
|                         |  |                   |  |                                                              |    |        |   |       |  |   |        |  

We continue to review and monitor the impact of rising energy costs, as well as other
factors, on our operating budgets for fiscal year 2009. Because some operating expenses are not recoverable from tenants, an increase in operating expenses due to one or more of the foregoing factors could have an adverse
effect on our results of operations.

Hotel Net Operating Income

Net operating income for our hotel property decreased approximately $0.7 million, a 6.80% decrease for the year ended December 31, 2008 as compared
to 2007. For the year ended December 31, 2007, the operations of the Long Wharf Marriott have been included as part of discontinued operations due to its sale on March 23, 2007.

The following reflects our occupancy and rate information for our Cambridge Center Marriott hotel property for the year ended December 31, 2008 and
2007:



|                                   |  |      |        |   |      |   |        |                  |  |       |   
|---------------------------------- |  | ---- | ------ | - | ---- | - | ------ | ---------------- |  | ----- | --
|                                   |  | 2008 |        |   | 2007 |   |        | PercentageChange | 
|Occupancy                          |  |      | 77.7   | % |      |   | 80.0   | %                |  | (2.88 | )%
|Average daily rate                 |  | $    | 217.70 |   |      | $ | 217.23 |                  |  | 0.21  | % 
|Revenue per available room, REVPAR |  | $    | 169.08 |   |      | $ | 173.80 |                  |  | (2.72 | )%



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Development and Management Services

Development and Management Services income increased approximately $10.0 million for the year ended
December 31, 2008 compared to 2007. The increase is primarily attributed to $2 million of acquisition fees and approximately $3.8 million of ongoing management fees from our joint ventures that acquired the General Motors Building, 540 Madison
Avenue, Two Grand Central Tower and 125 West 55thStreet in New York City, as well as development fees of approximately $2.5 million for our 20 F
Street third-party development project. We expect third-party fee income for fiscal 2009 to be between $28 million and $30 million, a modest decrease due to the completion of much of our joint venture development activity in 2008 and an expected
reduction in tenant services income.

Interest and Other Income

Interest and other income decreased by approximately $70.7 million for the year ended December 31, 2008 compared to 2007 as a result of lower overall interest rates and decreased cash balances. The approximate
average cash balances for the year ended December 31, 2008 and December 31, 2007 were $450.0 million and $1.7 billion, respectively. In addition, the average interest rate for the year ended December 31, 2008 compared to
December 31, 2007 decreased by approximately 2.80%.

Other Expenses

General and Administrative

General and administrative expenses increased approximately $2.5 million
for the year ended December 31, 2008 compared to 2007. The increase is primarily due to compensation expense associated with the 2008 OPP Awards offset by a loss in our deferred compensation plan and a decrease in abandoned project costs. We
anticipate our general & administrative expense to be between $76 million and $78 million for fiscal 2009. Our decision to suspend development of 250 West 55th Street in New York City may result in additional potential costs related to our
one existing signed lease, possible write-offs of leasing commissions, arrangements in place with contractors and subcontractors for the project and other possible costs which we are currently evaluating.

On January 24, 2008, Boston Properties, Inc.s compensation committee approved outperformance awards under the 1997 Plan to officers and
employees of Boston Properties, Inc. These 2008 OPP Awards are part of a new broad-based long-term incentive compensation program designed to provide our management team at several levels within the organization with the potential to earn equity
awards subject to outperforming and creating shareholder value in a pay-for-performance structure. 2008 OPP Awards utilize Boston Properties, Inc.s total return to shareholders (TRS) over a three-year measurement period
as the performance metric and include two years of time-based vesting after the end of the performance measurement period (subject to acceleration in certain events) as a retention tool. Recipients of 2008 OPP Awards will share in an outperformance
pool if Boston Properties, Inc.s TRS, including both share appreciation and dividends, exceeds absolute and relative hurdles over a three-year measurement period from February 5, 2008 to February 5, 2011, based on the average closing
price of a share of Boston Properties, Inc.s common stock of $92.8240 for the five trading days prior to and including February 5, 2008. Assuming no changes in Boston Properties, Inc.s aggregate annual per share dividend through
February 2011, Boston Properties, Inc.s common stock price would have to exceed $104.15 per share for recipients of 2008 OPP Awards to be eligible to earn any rewards. The aggregate reward that recipients of all 2008 OPP Awards can earn, as
measured by the outperformance pool, is subject to a maximum cap of $110 million, although OPP awards for an aggregate of up to approximately $104.8 million have been allocated to date and were granted on February 5, 2008. The balance remains
available for future grants. Under Statement of Financial Accounting Standards No. 123(R) Share-Based Payment the 2008 OPP Awards have an aggregate value of approximately $19.7 million which amount will generally be amortized into
earnings over the five-year plan period (although awards for retirement-eligible employees will be amortized over a three-year period). Because the 2008 OPP Awards requires a sustained price target to achieve the threshold stock price,



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unless the target has actually been met by the end of the applicable reporting period, we will exclude all contingently issueable shares from the diluted EPS
calculation. See Note 18 to the Consolidated Financial Statements.

Commencing in 2003, Boston Properties, Inc. began issuing restricted
stock and/or LTIP Units, as opposed to granting stock options and restricted stock, under the 1997 Plan as its primary vehicle for employee equity compensation. An LTIP Unit is generally the economic equivalent of a share of Boston Properties,
Inc.s restricted stock. Employees vest in restricted stock and LTIP Units over a four- or five-year term (for awards granted between 2003 and November 2006, vesting is over a five-year term with annual vesting of 0%, 0%, 25%, 35% and 40%; and
for awards granted after November 2006, vesting occurs in equal annual installments over a four-year term). Restricted stock and LTIP Units are valued based on observable market prices for similar instruments. Such value is recognized as an expense
ratably over the corresponding employee service period. LTIP Units that were issued in January 2005 and any future LTIP Unit awards will be valued using an option pricing model in accordance with the provisions of SFAS No. 123R. To the extent
restricted stock or LTIP Units are forfeited prior to vesting, the corresponding previously recognized expense is reversed as an offset to stock-based compensation. Stock-based compensation associated with approximately $27.6 million of
restricted stock and LTIP Units granted in February 2008 and approximately $18.5 million of restricted stock and LTIP Units granted in January 2007 will be incurred ratably over the four-year vesting period. Stock-based compensation associated with
approximately $11.3 million of restricted stock and LTIP Units granted in April 2006 will be incurred ratably over the five-year vesting period.

Interest Expense

Interest expense for the Total Property Portfolio decreased approximately $13.9 million for the year ended
December 31, 2008 compared to 2007 as detailed below:



|                                                                   |      |                                                |         |      |  |   |         |   |  |   |         |  
|------------------------------------------------------------------ | ---- | ---------------------------------------------- | ------- | ---- |  | - | ------- | - |  | - | ------- | -
|Transaction                                                        |      | Interest Expense forthe year ended
December 31 |        
|                                                                   | 2008 |                                                |         | 2007 |  |   | Change  |  
|                                                                   |      | (in thousands)                                 |        
|Decreases to interest expense due to:                              |      |                                                |         |      |  |   |         |   |  |   |         |  
|Repayment of mortgages (1)                                         |      | $                                              | 18,682  |      |  | $ | 48,603  |   |  | $ | (29,921 | )
|Increase in capitalized interest costs                             |      |                                                | (41,883 | )    |  |   | (31,036 | ) |  |   | (10,847 | )
|Principal amortization of continuing debt and other                |      |                                                | 191,433 |      |  |   | 198,357 |   |  |   | (6,924  | )
|                                                                   |      |                                                |         |      |  |   |         |   |  |   |         |  
|Total decreases to interest expense                                |      | $                                              | 168,232 |      |  | $ | 215,924 |   |  | $ | (47,692 | )
|                                                                   |      |                                                |        
|Increases to interest expense due to:                              |      |                                                |         |      |  |   |         |   |  |   |         |  
|Refinancing of 599 Lexington Avenue and other new debt             |      | $                                              | 57,738  |      |  | $ | 40,863  |   |  | $ | 16,875  |  
|Issuance by our Operating Partnership of exchangeable senior notes |      |                                                | 39,440  |      |  |   | 26,231  |   |  |   | 13,209  |  
|Borrowings under the Unsecured Line of Credit                      |      |                                                | 6,562   |      |  |   | 2,869   |   |  |   | 3,693   |  
|                                                                   |      |                                                |         |      |  |   |         |   |  |   |         |  
|Total increases to interest expense                                |      | $                                              | 103,740 |      |  | $ | 69,963  |   |  | $ | 33,777  |  
|                                                                   |      |                                                |         |      |  |   |         |   |  |   |         |  
|Total interest expense                                             |      | $                                              | 271,972 |      |  | $ | 285,887 |   |  | $ | (13,915 | )
|                                                                   |      |                                                |         |      |  |   |         |   |  |   |         |  



|(1) | Excludes refinancing of 599 Lexington Avenue.
|--- | ---------------------------------------------

On May 9, 2008, the FASB issued FASB Staff Position No. APB 14-1 Accounting for
Convertible Debt Instruments That May Be Settled in Cash upon Conversion (Including Partial Cash Settlement) (FSP No. APB 14-1). This pronouncement and the estimated effect that it will have on interest expense is discussed in
Item 7. Managements Discussion and Analysis of Financial Condition and Results of OperationsNewly Issued Accounting Standards. We expect interest expense to increase for fiscal 2009 due to the estimated impact of FSP
No. APB 14-1 and the suspension of construction at 250 West 55thStreet. We expect that our decision to suspend development of 250 West 55thStreet in New York City will result in a decrease in capitalized interest and a corresponding incremental increase in interest expense of
approximately $5 million to $9 million for fiscal 2009.



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At December 31, 2008, our variable rate debt consisted of our construction loans at South of Market,
Democracy Tower (formerly South of Market  Phase II) and Wisconsin Place Office construction projects, as well as our borrowings under our Unsecured Line of Credit. The following summarizes our outstanding debt as of December 31, 2008
compared with December 31, 2007:



|                                                      |  |                        |           |   |      |   |           |  
|----------------------------------------------------- |  | ---------------------- | --------- | - | ---- | - | --------- | -
|                                                      |  | December 31,           |          
|                                                      |  | 2008                   |           |   | 2007 |  
|                                                      |  | (dollars in thousands) |          
|Debt Summary:                                         |  |                        |           |   |      |   |           |  
|Balance                                               |  |                        |           |   |      |   |           |  
|Fixed rate                                            |  | $                      | 5,886,424 |   |      | $ | 5,369,243 |  
|Variable rate                                         |  |                        | 385,492   |   |      |   | 122,923   |  
|                                                      |  |                        |           |   |      |   |           |  
|Total                                                 |  | $                      | 6,271,916 |   |      | $ | 5,492,166 |  
|                                                      |  |                        |           |   |      |   |           |  
|Percent of total debt:                                |  |                        |           |   |      |   |           |  
|Fixed rate                                            |  |                        | 93.85     | % |      |   | 97.76     | %
|Variable rate                                         |  |                        | 6.15      | % |      |   | 2.24      | %
|                                                      |  |                        |           |   |      |   |           |  
|Total                                                 |  |                        | 100.00    | % |      |   | 100.00    | %
|                                                      |  |                        |           |   |      |   |           |  
|GAAP Weighted average interest rate at end of period: |  |                        |           |   |      |   |           |  
|Fixed rate                                            |  |                        | 5.36      | % |      |   | 5.58      | %
|Variable rate                                         |  |                        | 3.62      | % |      |   | 6.11      | %
|                                                      |  |                        |           |   |      |   |           |  
|Total                                                 |  |                        | 5.25      | % |      |   | 5.60      | %
|                                                      |  |                        |           |   |      |   |           |  

Depreciation and Amortization

Depreciation and amortization expense for the Total Property Portfolio increased approximately $17.9 million for the year ended December 31, 2008 compared to 2007. Approximately $10.0 million related to an
increase in the Same Property Portfolio and approximately $2.2 million related to acquisition activity. An increase of approximately $8.5 million was attributed to Properties Placed In-Service. These increases were offset by a decrease of
approximately $2.8 million due to the sale of Democracy Center in August 2007 and 5 Times Square in February 2007.

Capitalized Costs

Costs directly related to the development of rental properties are not included in our operating
results. These costs are capitalized and included in real estate assets on our Consolidated Balance Sheets and amortized over their useful lives. Capitalized development costs include interest, wages, property taxes, insurance and other project
costs incurred during the period of development. Capitalized wages for the year ended December 31, 2008 and 2007 were $12.2 million and $11.0 million, respectively. These costs are not included in the general and administrative expenses
discussed above. Interest capitalized for the year ended December 31, 2008 and 2007 was $41.9 million and $31.0 million, respectively. These costs are not included in the interest expense referenced above. Due to the suspension of construction
at 250 West 55thStreet late in the third quarter or early in the fourth quarter of 2009, we expect our 2009 capitalized interest will decrease by
approximately $5 million to $9 million and our 2009 capitalized wages will decrease by a modest amount.

Net Derivative Losses

On September 9, 2008, we executed an interest rate lock agreement with lenders at an all-in fixed rate, inclusive of the credit spread, of
6.10% per annum for an eight-year, $375.0 million loan collateralized by our Four Embarcadero Center property located in San Francisco, California. Our interest rate hedging program contemplated a financing with a ten-year term and, as a
result, under SFAS No. 133, during the third quarter of



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2008 we recognized a net derivative loss of approximately $6.6 million representing the partial ineffectiveness of our interest rate contracts. On
November 13, 2008, we closed on the Four Embarcadero Center mortgage. Under our interest rate hedging program, we will reclassify into earnings over the eight-year term of the loan as an increase in interest expense approximately $26.4 million
(approximately $3.3 million per year) of the amounts recorded on our Consolidated Balance Sheet within Accumulated Other Comprehensive Loss, which amounts represent the effective portion of the applicable interest rate hedging contracts.

Our interest rate hedging program also contemplated obtaining additional financing of at least $150.0 million by the end of 2008. In accordance with
SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities, as amended and interpreted, we determined that we would be unable to complete the financing by the required date under our hedging program. As a result,
during the fourth quarter of 2008, we recognized a net derivative loss of approximately $7.2 million representing the ineffectiveness of our remaining interest rate hedging contracts.

In addition, during the year ended December 31, 2008, we modified the estimated dates with respect to our anticipated financings under our interest
rate hedging program. As a result, we recognized a net derivative loss of approximately $3.3 million representing the partial ineffectiveness of the interest rate contracts.

Losses from Investments in Securities

We account for investments in trading securities at fair
value, with gains or losses resulting from changes in fair value recognized currently in earnings. The designation of trading securities is generally determined at acquisition. At December 31, 2008, investment in securities is comprised of an
investment in an unregistered money market fund. The investment was previously included in Cash and Cash Equivalents. In December 2007, the fund suspended cash redemptions by investors; investors may elect in-kind redemptions of the underlying
securities or maintain their investment in the fund and receive distributions as the underlying securities mature or are liquidated by the fund sponsor. As a result, we expect to retain this investment for a longer term than originally intended, and
the valuation of our investment is subject to changes in market conditions. Because interests in this fund are now valued at less than their $1.00 par value, we recognized losses of approximately $1.4 million and $0.3 million on our investment
during the years ended December 31, 2008 and 2007, respectively. We also maintain a deferred compensation plan that is designed to allow Boston Properties, Inc.s officers to defer a portion of their current income on a pre-tax basis and
receive a tax-deferred return on these deferrals. Our obligation under the plan is that of an unsecured promise to pay the deferred compensation to the plan participants in the future. At December 31, 2008 and 2007, we have balances of
approximately $6.6 million and $8.3 million, respectively, into a separate account, which is not restricted as to its use. We recognized income (losses) of approximately $(3.2) million and $0.3 million on the investments in the account associated
with our deferred compensation plan during the years ended December 31, 2008 and 2007, respectively.

Losses from Early Extinguishments of Debt

On February 12, 2007, we refinanced our mortgage loan collateralized by 599 Lexington Avenue located in New York City. The new
mortgage financing totaling $750.0 million bears interest at a fixed interest rate of 5.57% per annum and matures on March 1, 2017. The net proceeds of the new loan were used to refinance the $225.0 million mortgage loan on 599 Lexington
Avenue and the $475.0 million mortgage loan on Times Square Tower. In connection with the refinancing, the lien of the Times Square Tower mortgage was spread to 599 Lexington Avenue and released from Times Square Tower so that Times Square
Tower is no longer encumbered by any mortgage debt. There was no prepayment penalty associated with the repayment. In 2007, we recognized a loss from early extinguishment of debt totaling approximately $0.7 million consisting of the write-off of
unamortized deferred financing costs.

In conjunction with the sale of Democracy Center in Bethesda, Maryland on August 7, 2007, we
repaid the mortgage financing collateralized by the property totaling approximately $94.6 million. We paid a prepayment



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fee of approximately $2.6 million associated with the repayment. We recognized a loss from early extinguishment of debt totaling approximately $2.7 million
consisting of the prepayment fee and the write-off of unamortized deferred financing costs.

Income (loss) from unconsolidated joint ventures

For the year ended December 31, 2008, income (loss) from unconsolidated joint ventures decreased approximately $202.4 million
compared to December 31, 2007.

During December 2008, we recognized non-cash impairment charges which represented the
other-than-temporary decline in the fair values below the carrying values of certain of the Companys investments in unconsolidated joint ventures. In accordance with Accounting Principles Board Opinion No. 18 The Equity Method of
Accounting for Investments in Common Stock (APB No. 18), a loss in value of an investment under the equity method of accounting, which is other than a temporary decline, must be recognized. As a result, we recognized non-cash impairment
charges of approximately $31.9 million, $74.3 million, $45.1 million and $13.8 million on our investments in 540 Madison Avenue, Two Grand Central Tower, 125 West 55th Street and the Value-Added Fund, respectively. If the fair value of our
investments deteriorate further, we could recognize additional impairment charges which may be material.

During December 2008, an
unconsolidated joint venture in which we have a 50% interest suspended development activity on its Eighth Avenue and 46th Street project located in New York City. The proposed project was comprised of an assemblage of land parcels and air-rights,
including contracts to acquire land parcels and air-rights, on which the joint venture was to construct a Class A office property. As a result, we recognized a charge totaling approximately $23.2 million (including $2.9 million of non-cash
impairment charges in accordance with APB No. 18), which represented our share of land and air-rights impairment losses, forfeited contract deposits and previously incurred planning and pre-development costs.

On June 9, 2008, we completed the acquisition of the General Motors Building for a purchase price of approximately $2.8 billion. On August 12,
2008, we completed the acquisitions of 540 Madison Avenue and Two Grand Central Tower located in New York City, New York for an aggregate purchase price of approximately $705.0 million. On August 13, 2008, we completed the acquisition of 125
West 55th Street located in New York City, New York for an aggregate price of $444.0 million. Each acquisition was completed through a joint venture with US Real Estate Opportunities I, L.P. and Meraas Capital LLC. We have a 60% interest in each
venture and provide customary property management and leasing services for each venture.



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The following table presents actual financial
information for the joint ventures for the period ended December 31, 2008 for the General Motors Building and 540 Madison Avenue, Two Grand Central Tower and 125 West 55thStreet, respectively. These acquisitions will impact our income (loss) from unconsolidated joint ventures in future periods.



|                                                                          |  |                                                                              |         |   |                                                                                                                        |   |       
|------------------------------------------------------------------------- |  | ---------------------------------------------------------------------------- | ------- | - | ---------------------------------------------------------------------------------------------------------------------- | - | ------
|                                                                          |  | The General MotorsBuildingFor the period fromJune 9, 2008 December 31, 2008 |         |   | 540 Madison Avenue,Two GrandCentral Tower, 125West 55th StreetFor the period fromAugust 12, 2008 December 31, 2008(1)
|                                                                          |  | (in thousands)                                                               |         |   | (in thousands)                                                                                                        
|Base rent and recoveries from tenants                                     |  | $                                                                            | 105,634 |   |                                                                                                                        | $ | 34,587
|Straight-line rent                                                        |  |                                                                              | 7,965   |   |                                                                                                                        |   | 5,545 
|Fair value lease revenue                                                  |  |                                                                              | 79,365  |   |                                                                                                                        |   | 12,506
|Parking and other                                                         |  |                                                                              | 1,798   |   |                                                                                                                        |   | 523   
|                                                                          |  |                                                                              |         |   |                                                                                                                        |   |       
|Total rental revenue                                                      |  |                                                                              | 194,762 |   |                                                                                                                        |   | 53,161
|Operating expenses                                                        |  |                                                                              | 41,497  |   |                                                                                                                        |   | 14,663
|                                                                          |  |                                                                              |         |   |                                                                                                                        |   |       
|Revenue less operating expenses                                           |  |                                                                              | 153,265 |   |                                                                                                                        |   | 38,498
|Interest expense                                                          |  |                                                                              | 82,266  |   |                                                                                                                        |   | 12,547
|Fair value interest expense                                               |  |                                                                              | 4,477   |   |                                                                                                                        |   | 2,020 
|Depreciation and amortization                                             |  |                                                                              | 91,220  |   |                                                                                                                        |   | 22,225
|                                                                          |  |                                                                              |         |   |                                                                                                                        |   |       
|Income (Loss) before elimination of inter-entity interest on partner loan |  |                                                                              | (24,698 | ) |                                                                                                                        |   | 1,706 
|                                                                          |  |                                                                              |         |   |                                                                                                                        |   |       
|Companys share of Net Income (Loss) (60%)                                |  |                                                                              | (14,819 | ) |                                                                                                                        |   | 1,024 
|Elimination of inter-entity interest on partner loan                      |  |                                                                              | 16,932  |   |                                                                                                                        |   |      
|                                                                          |  |                                                                              |         |   |                                                                                                                        |   |       
|Income (loss) from unconsolidated joint ventures (60%)                    |  | $                                                                            | 2,113   |   |                                                                                                                        | $ | 1,024 
|                                                                          |  |                                                                              |         |   |                                                                                                                        |   |       



|(1) | Information for 125 West 55thStreet is presented for the period of August 13, 2008 through December 31, 2008.
|--- | -------------------------------------------------------------------------------------------------------------

On June 1,
2007, our Value-Added Fund sold Worldgate Plaza located in Herndon, Virginia for approximately $109.0 million. Worldgate Plaza is an office complex consisting of approximately 322,000 net rentable square feet. Net cash proceeds totaled approximately
$50.5 million, of which our share was approximately $20.3 million, after the repayment of the mortgage indebtedness of $57.0 million. Our share of the gain, which is included as income from joint ventures, was approximately $15.5 million which
amount reflects the achievement of certain return thresholds as provided for in the joint venture agreement.

Income from discontinued operations

For the year ended December 31, 2007, Orbital Sciences Campus and Broad Run Business Park, Building E, Newport Office Park and
Long Wharf Marriott were included as part of income from discontinued operations.

Minority interests in property partnerships

Minority interests in property partnerships for the years ended December 31, 2008 and 2007
consist of the outside equity interests in the venture that owns our Wisconsin Place Office property as well as our 505 9thStreet project.

Preferred distributions and allocation of undisturbed earnings

Preferred distributions and Allocation of Undistributed Earnings decreased approximately $10.8 million for the year ended December 31, 2008, compared to the year ended December 31, 2007. The decrease is due
to a



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decrease in the allocation of undistributed earnings of approximately $4.6 million and a decrease of approximately $6.2 million in preferred distributions as
a result of the special distribution declared in December 2007.

Gains on sales of real estate

On April 14, 2008, we sold a parcel of land located in Washington, DC for approximately $33.7 million. We had previously entered into a development
management agreement with the buyer to develop a Class A office property on the parcel totaling approximately 165,000 net rentable square feet. Due to our involvement in the construction of the project, the gain on sale estimated to total $23.4
million has been deferred and will be recognized over the project construction period generally, based on the percentage of total project costs incurred to estimated total project costs. As a result, we recognized a gain on sale during the year
ended December 31, 2008 of approximately $9.9 million.

On August 7, 2007, we sold Democracy Center in Bethesda, Maryland, for
approximately $280.5 million. Net cash proceeds totaled approximately $184.5 million, after the repayment of the mortgage indebtedness of approximately $94.6 million and closing costs of approximately $1.4 million, resulting in a gain on sale of
approximately $203.2 million. Due to our continuing involvement through an agreement with the buyer to manage the property for a fee after the sale, this property has not been categorized as discontinued operations. As of August 31, 2008, we no
longer provide management services for this building.

Pursuant to the purchase and sale agreement related to the sale of 280 Park Avenue,
we entered into a master lease agreement with the buyer at closing. Under the master lease agreement, we guaranteed that the buyer will receive at least a minimum amount of base rent from approximately 74,340 square feet of space during the ten-year
period following the expiration of the leases for this space. The leases for this space expired at various times between June 2006 and October 2007. The aggregate amount of base rent we guaranteed over the entire period from 2006 to 2017 is
approximately $67.3 million. During the year ended December 31, 2008 and 2007, we signed new qualifying leases for approximately 17,454 and 22,250 net rentable square feet of the remaining master lease obligation, resulting in the recognition
of approximately $23.4 million and $18.0 million of additional gain on sale of real estate, respectively. As of December 31, 2008, the remaining master lease obligation totaled approximately $0.9 million.

On February 15, 2007, we sold the long-term leasehold interest in 5 Times Square in New York City and related credits, for approximately $1.28
billion in cash. Net cash proceeds totaled approximately $1.23 billion, resulting in a gain on sale of approximately $736.2 million. Due to our continuing involvement through an agreement with the buyer to manage the property for a fee after the
sale, this property has not been categorized as discontinued operations.

Gains on sales of real estate from discontinued operations

On November 20, 2007, we sold our Orbital Sciences Campus and Broad Run Business Park, Building E properties located in Loudon
County, Virginia, for approximately $126.7 million. The Orbital Sciences Campus and Broad Run Business Park, Building E properties are comprised of three Class A office properties aggregating approximately 337,000 net rentable square feet and
an office/technical property totaling approximately 127,000 net rentable square feet, respectively. Net cash proceeds totaled approximately $125.4 million, resulting in a gain on sale of approximately $58.2 million.

On April 5, 2007, we sold Newport Office Park, an approximately 172,000 net rentable square foot Class A office property located in Quincy,
Massachusetts, for approximately $37.0 million. Net cash proceeds totaled approximately $33.7 million, resulting in a gain on sale of approximately $14.3 million.

On March 23, 2007, we completed the sale of the Long Wharf Marriott, a 402-room hotel located in Boston, Massachusetts for a total sale price of $231.0 million, or approximately $575,000 per room. The net gain on
sale was approximately $194.4 million.



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Comparison of the year ended December 31, 2007 to the year ended December 31, 2006

The table below shows selected operating information for the Same Property Portfolio and the Total
Property Portfolio. The Same Property Portfolio consists of 102 properties, including properties acquired or placed in-service on or prior to January 1, 2006 and owned through December 31, 2007, totaling approximately 25.5 million net
rentable square feet of space (excluding square feet of structured parking). The Total Property Portfolio includes the effects of the other properties either placed in-service, acquired or repositioned after January 1, 2006 or disposed of on or
prior to December 31, 2007. Properties Placed In-Service includes our 505 9thStreet joint venture project. In connection with
partially placing this property in-service, we consolidated the joint venture entity that owns the property as of October 1, 2007 due to the involvement we have in the venture once the property is operational. The Same Property Portfolio
includes our Cambridge Center Marriott hotel property, but does not include the Long Wharf Marriott hotel property, which was sold on March 23, 2007. This table includes a reconciliation from the Same Property Portfolio to the Total Property
Portfolio by also providing information for the year ended December 31, 2007 and 2006 with respect to the properties which were acquired, placed in-service, repositioned or sold.



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|                                                                 |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   |           |   |  |   |           |   |  |   |         |   |  |         |   
|---------------------------------------------------------------- |  | ----------------------- | --------- | ---- | --------------- | ------------------- | ------------------ | - | ------- | -------------------------- |  | ---------------------- | -- | ------------------------ | - | ------ |  | - | ------- |  | - | ------ | - | ---- | - | ----- | - | ---- | - | ------ |  | - | ------ |  | - | ------------------- |  | - | ------- |  | - | --------- | - |  | - | --------- | - |  | - | ------- | - |  | ------- | --
|                                                                 |  | Same Property Portfolio |           |      | Properties Sold |                     | PropertiesAcquired |   |         | PropertiesPlacedIn-Service |  | PropertiesRepositioned |    | Total Property Portfolio |  
|(dollars in thousands)                                           |  | 2007                    |           | 2006 |                 | Increase/(Decrease) |                    |   | %Change |                            |  | 2007                   |    | 2006                     |   | 2007   |  |   | 2006    |  |   | 2007   |   | 2006 |   | 2007  |   | 2006 |   | 2007   |  |   | 2006   |  |   | Increase/(Decrease) |  |   | %Change | 
|Rental Revenue:                                                  |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   |           |   |  |   |           |   |  |   |         |   |  |         |   
|Rental Revenue                                                   |  | $                       | 1,196,883 |      | $               | 1,142,388           |                    | $ | 54,495  |                            |  | 4.77                   | %  |                          | $ | 21,902 |  | $ | 124,828 |  | $ | 48,940 |   |      | $ | 8,244 |   |      | $ | 32,313 |  | $ | 24,117 |  | $ | 27,199              |  | $ | 20,402  |  | $ | 1,327,237 |   |  | $ | 1,319,979 |   |  | $ | 7,258   |   |  | 0.55    | % 
|Termination Income                                               |  |                         | 6,882     |      |                 | 6,999               |                    |   | (117    | )                          |  | (1.67                  | )% |                          |   |       |  |   | 1,138   |  |   | 100    |   |      |   |      |   |      |   |       |  |   |       |  |   |                    |  |   |        |  |   | 6,982     |   |  |   | 8,137     |   |  |   | (1,155  | ) |  | (14.19  | )%
|                                                                 |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   |           |   |  |   |           |   |  |   |         |   |  |         |   
|Total Rental Revenue                                             |  |                         | 1,203,765 |      |                 | 1,149,387           |                    |   | 54,378  |                            |  | 4.73                   | %  |                          |   | 21,902 |  |   | 125,966 |  |   | 49,040 |   |      |   | 8,244 |   |      |   | 32,313 |  |   | 24,117 |  |   | 27,199              |  |   | 20,402  |  |   | 1,334,219 |   |  |   | 1,328,116 |   |  |   | 6,103   |   |  | 0.50    | % 
|                                                                 |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   |           |   |  |   |           |   |  |   |         |   |  |         |   
|Real Estate Operating Expenses                                   |  |                         | 419,054   |      |                 | 389,872             |                    |   | 29,182  |                            |  | 7.49                   | %  |                          |   | 6,369  |  |   | 35,439  |  |   | 14,964 |   |      |   | 2,239 |   |      |   | 7,995  |  |   | 4,731  |  |   | 7,458               |  |   | 5,424   |  |   | 455,840   |   |  |   | 437,705   |   |  |   | 18,135  |   |  | 4.14    | % 
|                                                                 |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   |           |   |  |   |           |   |  |   |         |   |  |         |   
|Net Operating Income, excluding hotel                            |  |                         | 784,711   |      |                 | 759,515             |                    |   | 25,196  |                            |  | 3.32                   | %  |                          |   | 15,533 |  |   | 90,527  |  |   | 34,076 |   |      |   | 6,005 |   |      |   | 24,318 |  |   | 19,386 |  |   | 19,741              |  |   | 14,978  |  |   | 878,379   |   |  |   | 890,411   |   |  |   | (12,032 | ) |  | (1.35   | )%
|                                                                 |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   |           |   |  |   |           |   |  |   |         |   |  |         |   
|Hotel Net OperatingIncome (1)                                    |  |                         | 10,046    |      |                 | 8,048               |                    |   | 1,998   |                            |  | 24.83                  | %  |                          |   |       |  |   |        |  |   |       |   |      |   |      |   |      |   |       |  |   |       |  |   |                    |  |   |        |  |   | 10,046    |   |  |   | 8,048     |   |  |   | 1,998   |   |  | 24.83   | % 
|                                                                 |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   |           |   |  |   |           |   |  |   |         |   |  |         |   
|Consolidated Net Operating Income (1)                            |  |                         | 794,757   |      |                 | 767,563             |                    |   | 27,194  |                            |  | 3.54                   | %  |                          |   | 15,533 |  |   | 90,527  |  |   | 34,076 |   |      |   | 6,005 |   |      |   | 24,318 |  |   | 19,386 |  |   | 19,741              |  |   | 14,978  |  |   | 888,425   |   |  |   | 898,459   |   |  |   | (10,034 | ) |  | (1.12   | )%
|                                                                 |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   |           |   |  |   |           |   |  |   |         |   |  |         |   
|Other Revenue:                                                   |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   |           |   |  |   |           |   |  |   |         |   |  |         |   
|Development and Management Services                              |  |                         |          |      |                 |                    |                    |   |        |                            |  |                       |    |                          |   |       |  |   |        |  |   |       |   |      |   |      |   |      |   |       |  |   |       |  |   |                    |  |   |        |  |   | 20,553    |   |  |   | 19,820    |   |  |   | 733     |   |  | 3.70    | % 
|Interest and Other                                               |  |                         |          |      |                 |                    |                    |   |        |                            |  |                       |    |                          |   |       |  |   |        |  |   |       |   |      |   |      |   |      |   |       |  |   |       |  |   |                    |  |   |        |  |   | 89,706    |   |  |   | 36,677    |   |  |   | 53,029  |   |  | 144.58  | % 
|                                                                 |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   |           |   |  |   |           |   |  |   |         |   |  |         |   
|Total Other Revenue                                              |  |                         |          |      |                 |                    |                    |   |        |                            |  |                       |    |                          |   |       |  |   |        |  |   |       |   |      |   |      |   |      |   |       |  |   |       |  |   |                    |  |   |        |  |   | 110,259   |   |  |   | 56,497    |   |  |   | 53,762  |   |  | 95.16   | % 
|Other Expenses:                                                  |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   |           |   |  |   |           |   |  |   |         |   |  |         |   
|General and administrative expense                               |  |                         |          |      |                 |                    |                    |   |        |                            |  |                       |    |                          |   |       |  |   |        |  |   |       |   |      |   |      |   |      |   |       |  |   |       |  |   |                    |  |   |        |  |   | 69,882    |   |  |   | 59,375    |   |  |   | 10,507  |   |  | 17.70   | % 
|Interest Expense                                                 |  |                         |          |      |                 |                    |                    |   |        |                            |  |                       |    |                          |   |       |  |   |        |  |   |       |   |      |   |      |   |      |   |       |  |   |       |  |   |                    |  |   |        |  |   | 285,887   |   |  |   | 298,260   |   |  |   | (12,373 | ) |  | (4.15   | )%
|Depreciation and amortization                                    |  |                         | 238,235   |      |                 | 234,434             |                    |   | 3,801   |                            |  | 1.62                   | %  |                          |   | 2,767  |  |   | 18,049  |  |   | 24,155 |   |      |   | 3,531 |   |      |   | 8,731  |  |   | 7,365  |  |   | 4,361               |  |   | 3,032   |  |   | 278,249   |   |  |   | 266,411   |   |  |   | 11,838  |   |  | 4.44    | % 
|Loss from early extinguishments of debt                          |  |                         |          |      |                 |                    |                    |   |        |                            |  |                       |    |                          |   |       |  |   |        |  |   |       |   |      |   |      |   |      |   |       |  |   |       |  |   |                    |  |   |        |  |   | 3,417     |   |  |   | 32,143    |   |  |   | (28,726 | ) |  | (89.37  | )%
|                                                                 |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   |           |   |  |   |           |   |  |   |         |   |  |         |   
|Total Other Expenses                                             |  |                         | 238,235   |      |                 | 234,434             |                    |   | 3,801   |                            |  | 1.62                   | %  |                          |   | 2,767  |  |   | 18,049  |  |   | 24,155 |   |      |   | 3,531 |   |      |   | 8,731  |  |   | 7,365  |  |   | 4,361               |  |   | 3,032   |  |   | 637,435   |   |  |   | 656,189   |   |  |   | (18,754 | ) |  | (2.86   | )%
|                                                                 |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   |           |   |  |   |           |   |  |   |         |   |  |         |   
|Income before minority interests                                 |  | $                       | 556,522   |      | $               | 533,129             |                    | $ | 23,393  |                            |  | 4.39                   | %  |                          | $ | 12,766 |  | $ | 72,478  |  | $ | 9,921  |   |      | $ | 2,474 |   |      | $ | 15,587 |  | $ | 12,021 |  | $ | 15,380              |  | $ | 11,946  |  | $ | 361,249   |   |  | $ | 298,767   |   |  | $ | 62,482  |   |  | 20.91   | % 
|Income from unconsolidated joint ventures                        |  | $                       | 5,799     |      | $               | 7,230               |                    | $ | (1,431  | )                          |  | (19.79                 | )% |                          | $ | 15,125 |  | $ | 17,455  |  | $ | (496   | ) |      | $ | (178  | ) |      | $ |       |  | $ |       |  | $ |                    |  | $ |        |  |   | 20,428    |   |  |   | 24,507    |   |  |   | (4,079  | ) |  | (16.64  | )%
|Income from discontinued operations                              |  | $                       |          |      | $               |                    |                    | $ |        |                            |  |                       |    |                          | $ | 7,274  |  | $ | 19,081  |  | $ |        |   |      | $ |       |   |      | $ |       |  | $ |       |  | $ |                    |  | $ |        |  |   | 7,274     |   |  |   | 19,081    |   |  |   | (11,807 | ) |  | (61.88  | )%
|Minority interests in property partnerships                      |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   | (84       | ) |  |   | 2,013     |   |  |   | (2,097  | ) |  | (104.17 | )%
|Gains on sales of real estate                                    |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   | 957,406   |   |  |   | 727,131   |   |  |   | 230,275 |   |  | 31.67   | % 
|Gains on sales of real estate from discontinued operations       |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   | 266,817   |   |  |   |          |   |  |   | 266,817 |   |  | 100.0   | % 
|Preferred distributions and allocation of undistributed earnings |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   | (15,014   | ) |  |   | (22,814   | ) |  |   | (7,800  | ) |  | (34.19  | )%
|                                                                 |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   |           |   |  |   |           |   |  |   |         |   |  |         |   
|Net Income available to common unitholders                       |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  | $ | 1,598,076 |   |  | $ | 1,048,685 |   |  | $ | 549,391 |   |  | 52.39   | % 
|                                                                 |  |                         |           |      |                 |                     |                    |   |         |                            |  |                        |    |                          |   |        |  |   |         |  |   |        |   |      |   |       |   |      |   |        |  |   |        |  |   |                     |  |   |         |  |   |           |   |  |   |           |   |  |   |         |   |  |         |   



|(1) | For a detailed discussion of NOI, including the reasons management believes NOI is useful to investors, see page 52. Hotel Net Operating Income for the years ended December 31,
2007 and 2006 is comprised of Hotel Revenue of $37,811 and $33,014, respectively, less Hotel Expenses of $27,765 and $24,966, respectively, per the Consolidated Income Statement.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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Rental Revenue

The increase of approximately $7.3 million in the Total Property Portfolio Rental Revenue is comprised of increases and decreases within the five categories that comprise our Total Property Portfolio. Rental revenue
from the Same Property Portfolio increased approximately $54.5 million, Properties Sold decreased approximately $102.9 million, Properties Acquired increased approximately $40.7 million, Properties Placed In-Service increased approximately $8.2
million and Properties Repositioned increased approximately $6.8 million for the year ended December 31, 2007 compared to the year ended December 31, 2006.

We incur certain tenant specific property costs for which we are reimbursed from our tenants. Starting in 2007, we have included these reimbursements in rental revenue and included the tenant specific operating cost
within real estate operating expenses. This income and expense classification in 2007 results in a presented increase to comparable rental revenue and real estate operating expenses, however does not impact our consolidated net operating income. For
the year ended December 31, 2007 and 2006, the rental income and real estate operating expense gross up was approximately $8.9 million and $12.0 million, respectively.

Rental revenue from the Same Property Portfolio increased approximately $54.5 million for the year ended December 31, 2007 compared to 2006.
Included in the Same Property Portfolio rental revenue is an overall increase in contractual rental revenue of approximately $39.1 million, offset by a decrease of approximately $7.3 million in straight-line rents. Approximately $18.8 million of the
increase from the Same Property Portfolio was due to an increase in recoveries from tenants which correlates with the increase in operating expenses. Approximately $3.9 million of the increase from the Same Property Portfolio was due to an increase
in parking and other income.

The increase in rental revenue from Properties Placed In-Service relates to partially placing in-service our
505 9th Street development project in the fourth quarter of 2007, our Seven Cambridge Center development project in the first quarter of 2006 and our 12290 Sunrise Valley development project in the second quarter of 2006. Rental revenue from
Properties Placed In-Service increased approximately $8.2 million, as detailed below:



|                       |  |                        |  |                                              |        |        |   |        |  |   |      
|---------------------- |  | ---------------------- |  | -------------------------------------------- | ------ | ------ | - | ------ |  | - | -----
|Property               |  | Date Placed In-Service |  | Rental Revenuefor the year ended December 31
|                       |  | 2007                   |  | 2006                                         |        | Change
|                       |  |                        |  | (in thousands)                              
|Seven Cambridge Center |  | First Quarter, 2006    |  | $                                            | 22,138 |        | $ | 19,939 |  | $ | 2,199
|12290 Sunrise Valley   |  | Second Quarter, 2006   |  |                                              | 6,338  |        |   | 4,178  |  |   | 2,160
|505 9th Street         |  | Fourth Quarter, 2007   |  |                                              | 3,837  |        |   |       |  |   | 3,837
|                       |  |                        |  |                                              |        |        |   |        |  |   |      
|Total                  |  |                        |  | $                                            | 32,313 |        | $ | 24,117 |  | $ | 8,196
|                       |  |                        |  |                                              |        |        |   |        |  |   |      

The acquisitions of 6601 & 6605 Springfield Center Drive, 103 Fourth Avenue, Kingstowne
Towne Center, the Mountain View Properties, North First Business Park and Springfield Metro Center in 2007, and 303 Almaden Boulevard, 3200 Zanker Road and Four and Five Cambridge Center in 2006, increased revenue from Properties Acquired by
approximately $40.7 million for the year ended December 31, 2007 as detailed below:



|                                     |  |                   |  |                                              |        |        |   |       |  |   |       
|------------------------------------ |  | ----------------- |  | -------------------------------------------- | ------ | ------ | - | ----- |  | - | ------
|Property                             |  | Date Acquired     |  | Rental Revenuefor the year ended December 31
|                                     |  | 2007              |  | 2006                                         |        | Change
|                                     |  |                   |  | (in thousands)                              
|Four and Five Cambridge Center       |  | November 30, 2006 |  | $                                            | 18,605 |        | $ | 1,265 |  | $ | 17,340
|Kingstowne Towne Center              |  | March 30, 2007    |  |                                              | 10,631 |        |   |      |  |   | 10,631
|3200 Zanker Road                     |  | August 10, 2006   |  |                                              | 10,520 |        |   | 3,839 |  |   | 6,681 
|303 Almaden Boulevard                |  | June 30, 2006     |  |                                              | 6,402  |        |   | 3,140 |  |   | 3,262 
|Mountain View Properties             |  | November 27, 2007 |  |                                              | 1,275  |        |   |      |  |   | 1,275 
|103 Fourth Avenue                    |  | January 29, 2007  |  |                                              | 720    |        |   |      |  |   | 720   
|6601 & 6605 Springfield Center Drive |  | January 18, 2007  |  |                                              | 685    |        |   |      |  |   | 685   
|North First Business Park            |  | December 13, 2007 |  |                                              | 102    |        |   |      |  |   | 102   
|Springfield Metro Center             |  | April 11, 2007    |  |                                              |       |        |   |      |  |   |      
|                                     |  |                   |  |                                              |        |        |   |       |  |   |       
|Total                                |  |                   |  | $                                            | 48,940 |        | $ | 8,244 |  | $ | 40,696
|                                     |  |                   |  |                                              |        |        |   |       |  |   |       



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Rental revenue from Properties Repositioned for the year ended December 31, 2007 increased
approximately $6.8 million over the year ended December 31, 2006. Our Capital Gallery expansion project is included in Properties Repositioned for the year ended December 31, 2007 and December 31, 2006. In April 2006, tenants began to
take occupancy and we placed our Capital Gallery expansion project in-service in July 2006.

The aggregate increase in rental revenue was
offset by the sales of Democracy Center and 5 Times Square in 2007 and 280 Park Avenue in 2006. These properties have not been classified as discontinued operations due to our continuing involvement as the property manager for each property through
agreements entered into at the time of sale. Rental Revenue from Properties Sold decreased by approximately $102.9 million, as detailed below:



|                 |  |                   |  |                                              |        |        |   |         |  |   |          |  
|---------------- |  | ----------------- |  | -------------------------------------------- | ------ | ------ | - | ------- |  | - | -------- | -
|Property         |  | Date Sold         |  | Rental Revenuefor the year ended December 31 |       
|                 |  | 2007              |  | 2006                                         |        | Change |  
|                 |  |                   |  | (in thousands)                               |       
|Democracy Center |  | August 7, 2007    |  | $                                            | 12,016 |        | $ | 17,825  |  | $ | (5,809   | )
|5 Times Square   |  | February 15, 2007 |  |                                              | 9,886  |        |   | 74,795  |  |   | (64,909  | )
|280 Park Avenue  |  | June 6, 2006      |  |                                              |       |        |   | 32,208  |  |   | (32,208  | )
|                 |  |                   |  |                                              |        |        |   |         |  |   |          |  
|Total            |  |                   |  | $                                            | 21,902 |        | $ | 124,828 |  | $ | (102,926 | )
|                 |  |                   |  |                                              |        |        |   |         |  |   |          |  

Termination Income

Termination income for the year ended December 31, 2007 was related to multiple tenants across the Total Property Portfolio that terminated their leases, and we recognized termination income totaling
approximately $7.0 million. This compared to termination income of $8.1 million for the year ended December 31, 2006.

Real Estate Operating
Expenses

The $18.1 million increase in property operating expenses (real estate taxes, utilities, insurance, repairs and
maintenance, cleaning and other property-related expenses) in the Total Property Portfolio is comprised of increases and decreases within five categories that comprise our Total Property Portfolio. Operating expenses for the Same Property Portfolio
increased approximately $29.2 million, Properties Sold decreased approximately $29.1 million, Properties Acquired increased approximately $12.7 million, Properties Placed In-Service increased approximately $3.3 million and Properties Repositioned
increased approximately $2.0 million.

Operating expenses from the Same Property Portfolio increased approximately $29.2 million for the
year ended December 31, 2007 compared to 2006. Included in Same Property Portfolio operating expenses is an increase in utility expenses of approximately $2.5 million, which represents an increase of approximately 3% over the prior year. In
addition, real estate taxes increased approximately $10.7 million due to increased real estate tax assessments and repairs and maintenance increased approximately $8.4 million. The remaining $7.6 million increase in the Same Property Portfolio
operating expenses is related to an increase in cleaning contracts and other general and administrative items.



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The acquisitions of 6601 & 6605 Springfield Center Drive, 103 Fourth Avenue, Kingstowne Towne
Center, the Mountain View Properties, North First Business Park and Springfield Metro Center in 2007, and 303 Almaden Boulevard, 3200 Zanker Road and Four and Five Cambridge Center in 2006, increased operating expenses from Properties Acquired by
approximately $12.7 million for the year ended December 31, 2007 as detailed below:



|                                     |  |                   |  |                                                             |        |        |   |       |  |   |       
|------------------------------------ |  | ----------------- |  | ----------------------------------------------------------- | ------ | ------ | - | ----- |  | - | ------
|Property                             |  | Date Acquired     |  | Real Estate Operating Expensefor the year ended December 31
|                                     |  | 2007              |  | 2006                                                        |        | Change
|                                     |  |                   |  | (in thousands)                                             
|Four and Five Cambridge Center       |  | November 30, 2006 |  | $                                                           | 6,871  |        | $ | 519   |  | $ | 6,352 
|Kingstowne Towne Center              |  | March 30, 2007    |  |                                                             | 2,591  |        |   |      |  |   | 2,591 
|303 Almaden Boulevard                |  | June 30, 2006     |  |                                                             | 2,345  |        |   | 1,223 |  |   | 1,122 
|3200 Zanker Road                     |  | August 10, 2006   |  |                                                             | 1,837  |        |   | 497   |  |   | 1,340 
|103 Fourth Avenue                    |  | January 29, 2007  |  |                                                             | 606    |        |   |      |  |   | 606   
|Mountain View Properties             |  | November 27, 2007 |  |                                                             | 412    |        |   |      |  |   | 412   
|6601 & 6605 Springfield Center Drive |  | January 18, 2007  |  |                                                             | 167    |        |   |      |  |   | 167   
|Springfield Metro Center             |  | April 11, 2007    |  |                                                             | 89     |        |   |      |  |   | 89    
|North First Business Park            |  | December 13, 2007 |  |                                                             | 46     |        |   |      |  |   | 46    
|                                     |  |                   |  |                                                             |        |        |   |       |  |   |       
|Total                                |  |                   |  | $                                                           | 14,964 |        | $ | 2,239 |  | $ | 12,725
|                                     |  |                   |  |                                                             |        |        |   |       |  |   |       

The increase in operating expenses from Properties Placed In-Service relates to partially placing
in-service our 505 9th Street development project in the fourth quarter of 2007, our Seven Cambridge Center development project in the first quarter of 2006 and our 12290 Sunrise Valley development project in the second quarter of 2006. Operating
expenses from Properties Placed In-Service increased approximately $3.3 million, as detailed below:



|                       |  |                        |  |                                                              |       |        |   |       |  |   |      
|---------------------- |  | ---------------------- |  | ------------------------------------------------------------ | ----- | ------ | - | ----- |  | - | -----
|Property               |  | Date Placed In-Service |  | Real Estate Operating Expensesfor the year ended December 31
|                       |  | 2007                   |  | 2006                                                         |       | Change
|                       |  |                        |  | (in thousands)                                              
|Seven Cambridge Center |  | First Quarter, 2006    |  | $                                                            | 5,521 |        | $ | 4,277 |  | $ | 1,244
|12290 Sunrise Valley   |  | Second Quarter, 2006   |  |                                                              | 1,278 |        |   | 454   |  |   | 824  
|505 9th Street         |  | Fourth Quarter, 2007   |  |                                                              | 1,196 |        |   |      |  |   | 1,196
|                       |  |                        |  |                                                              |       |        |   |       |  |   |      
|Total                  |  |                        |  | $                                                            | 7,995 |        | $ | 4,731 |  | $ | 3,264
|                       |  |                        |  |                                                              |       |        |   |       |  |   |      

Operating expenses from Properties Repositioned for the year ended December 31, 2007
increased approximately $2.0 million over the year ended December 31, 2006. Our Capital Gallery expansion project is included in Properties Repositioned for the year ended December 31, 2007 and December 31, 2006. In April 2006,
tenants began to take occupancy and during July 2006, we placed our Capital Gallery expansion project in-service.

A decrease of
approximately $29.1 million in the Total Property Portfolio operating expenses was due to the sales of Democracy Center and 5 Times Square in 2007 and 280 Park Avenue in 2006, as detailed below:



|                 |  |                   |  |                                                              |       |        |   |        |  |   |         |  
|---------------- |  | ----------------- |  | ------------------------------------------------------------ | ----- | ------ | - | ------ |  | - | ------- | -
|Property         |  | Date Sold         |  | Real Estate Operating Expensesfor the year ended December 31 |      
|                 |  | 2007              |  | 2006                                                         |       | Change |  
|                 |  |                   |  | (in thousands)                                               |      
|Democracy Center |  | August 7, 2007    |  | $                                                            | 4,204 |        | $ | 6,144  |  | $ | (1,940  | )
|5 Times Square   |  | February 15, 2007 |  |                                                              | 2,165 |        |   | 14,988 |  |   | (12,823 | )
|280 Park Avenue  |  | June 6, 2006      |  |                                                              |      |        |   | 14,307 |  |   | (14,307 | )
|                 |  |                   |  |                                                              |       |        |   |        |  |   |         |  
|Total            |  |                   |  | $                                                            | 6,369 |        | $ | 35,439 |  | $ | (29,070 | )
|                 |  |                   |  |                                                              |       |        |   |        |  |   |         |  



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Hotel Net Operating Income

Net operating income for our hotel property increased approximately $2.0 million, a 24.8% increase for the year ended December 31, 2007 as compared to 2006. For the year ended December 31, 2006, the
operations of the Long Wharf Marriott was included as part of discontinued operations due to its sale on March 23, 2007.

The
following reflects our occupancy and rate information for our Cambridge Center Marriott hotel property for the year ended December 31, 2007 and 2006:



|                                   |  |      |        |   |      |   |        |                  |  |      |  
|---------------------------------- |  | ---- | ------ | - | ---- | - | ------ | ---------------- |  | ---- | -
|                                   |  | 2007 |        |   | 2006 |   |        | PercentageChange | 
|Occupancy                          |  |      | 80.0   | % |      |   | 75.1   | %                |  | 6.5  | %
|Average daily rate                 |  | $    | 217.23 |   |      | $ | 194.52 |                  |  | 11.7 | %
|Revenue per available room, REVPAR |  | $    | 173.80 |   |      | $ | 146.15 |                  |  | 18.9 | %

Development and Management Services

Development and Management Services income increased approximately $0.7 million for the year ended December 31, 2007 compared to 2006. We have
maintained management contracts following the sales of Democracy Center and 5 Times Square in 2007, as well as the sale of 280 Park Avenue on June 6, 2006, which in the aggregate contributed to an increase of approximately $1.1 million in
management fees. A decrease of approximately $0.4 million was attributed to reduced work order income.

Interest and Other Income

Interest and other income increased by approximately $53.0 million for the year ended December 31, 2007 compared to 2006 as a result of higher
overall interest rates and increased cash balances. In February 2007, we issued $862.5 million of 2.875% unsecured exchangeable senior notes. On February 15, 2007, we completed the sale of our long-term leasehold interest in 5 Times Square in
New York City for approximately $1.23 billion in cash. On March 23, 2007, we completed the sale of the Long Wharf Marriott for approximately $225.6 million in cash. On April 5, 2007, we completed the sale of Newport Office Park for
approximately $33.7 million in cash. On August 7, 2007, we completed the sale of Democracy Center for approximately $184.5 million in cash and on November 20, 2007, we completed the sale of Orbital Sciences Campus and Broad Run Business
Park Building E properties for an aggregate of approximately $125.4 million in cash.

Other Expenses

General and Administrative

General and administrative
expenses increased approximately $10.5 million for the year ended December 31, 2007 compared to 2006. An overall increase of approximately $2.6 million was attributed to bonuses and salaries for the year ended December 31, 2007 compared to
2006 as well as an increase in long-term compensation expense of approximately $3.5 million. For the year ended December 31, 2007, we recognized additional expenses related to abandoned project costs of approximately $4.5 million.

Commencing in 2003, Boston Properties, Inc. began issuing restricted stock and/or LTIP Units, as opposed to granting stock options and restricted
stock, under the 1997 Plan as its primary vehicle for employee equity compensation. An LTIP Unit is generally the economic equivalent of a share of Boston Properties, Inc.s restricted stock. Employees vest in restricted stock and LTIP Units
over a four- or five-year term (for awards granted between 2003 and November 2006, vesting is over a five-year term with annual vesting of 0%, 0%, 25%,



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35% and 40%; and for awards granted after November 2006, vesting occurs in equal annual installments over a four-year term). Restricted stock and LTIP Units
are valued based on observable market prices for similar instruments. Such value is recognized as an expense ratably over the corresponding employee service period. LTIP Units that were issued in January 2005 and any future LTIP Unit awards will be
valued using an option pricing model in accordance with the provisions of SFAS No. 123R. To the extent restricted stock or LTIP Units are forfeited prior to vesting, the corresponding previously recognized expense is reversed as an offset to
stock-based compensation. Stock-based compensation associated with approximately $27.6 million of restricted stock and LTIP Units granted in February 2008 and approximately $18.5 million of restricted stock and LTIP Units granted in
January 2007 will be incurred ratably over the four-year vesting period. Stock-based compensation associated with approximately $11.3 million of restricted stock and LTIP Units granted in April 2006 will be incurred ratably over the five-year
vesting period.

Interest Expense

Interest expense for the Total Property Portfolio decreased approximately $12.4 million for the
year ended December 31, 2007 compared to 2006. The decrease is due to (1) the repayment of outstanding mortgage debt in connection with the sale of Democracy Center in August 2007 and 280 Park Avenue in June 2006, which decreased interest
expense by $11.2 million, (2) the repayment of our mortgage loans collateralized by Capital Gallery, 191 Spring Street, 101 Carnegie Center, Seven Cambridge Center, Embarcadero Center Three and Embarcadero Center Four, and our 504, 506, 508 and
510 Carnegie Center properties, which decreased interest expense by approximately $15.9 million, and (3) an increase in capitalized interest costs which results in a decrease of interest expense of approximately $18.5 million. These decreases
were offset by (1) an increase of approximately $4.4 million related to interest paid on the $450 million unsecured exchangeable senior notes issued in the second quarter of 2006 at a per annum interest rate of 3.75%, (2) an increase of
approximately $26.2 million related to interest paid on the $862.5 million unsecured exchangeable senior notes issued in the first quarter of 2007 at an effective per annum interest rate of 3.438% and (3) an increase of approximately $4.3
million related to the acquisition of Kingstowne Towne Center on March 30, 2007 as well as the consolidation of our 505 9thjoint venture
property due to the involvement we now have because the property is operational. The remaining decrease is attributed to scheduled loan amortization on our outstanding debt.

At December 31, 2007, our variable rate debt consisted of our construction loan at South of Market. The following summarizes our outstanding debt as
of December 31, 2007 compared with December 31, 2006:



|                                                      |  |                        |           |   |      |   |           |  
|----------------------------------------------------- |  | ---------------------- | --------- | - | ---- | - | --------- | -
|                                                      |  | December 31,           |          
|                                                      |  | 2007                   |           |   | 2006 |  
|                                                      |  | (dollars in thousands) |          
|Debt Summary:                                         |  |                        |           |   |      |   |           |  
|Balance                                               |  |                        |           |   |      |   |           |  
|Fixed rate                                            |  | $                      | 5,369,243 |   |      | $ | 3,889,447 |  
|Variable rate                                         |  |                        | 122,923   |   |      |   | 711,490   |  
|                                                      |  |                        |           |   |      |   |           |  
|Total                                                 |  | $                      | 5,492,166 |   |      | $ | 4,600,937 |  
|                                                      |  |                        |           |   |      |   |           |  
|Percent of total debt:                                |  |                        |           |   |      |   |           |  
|Fixed rate                                            |  |                        | 97.76     | % |      |   | 84.54     | %
|Variable rate                                         |  |                        | 2.24      | % |      |   | 15.46     | %
|                                                      |  |                        |           |   |      |   |           |  
|Total                                                 |  |                        | 100.00    | % |      |   | 100.00    | %
|                                                      |  |                        |           |   |      |   |           |  
|GAAP Weighted average interest rate at end of period: |  |                        |           |   |      |   |           |  
|Fixed rate                                            |  |                        | 5.58      | % |      |   | 6.19      | %
|Variable rate                                         |  |                        | 6.11      | % |      |   | 5.80      | %
|                                                      |  |                        |           |   |      |   |           |  
|Total                                                 |  |                        | 5.60      | % |      |   | 6.13      | %
|                                                      |  |                        |           |   |      |   |           |  



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Depreciation and Amortization

Depreciation and amortization expense for the Total Property Portfolio increased approximately $11.8 million for the year ended December 31, 2007 compared to 2006. The increase in depreciation and amortization
consisted of approximately $20.6 million related to the 2007 acquisitions compared with the 2006 activity, approximately $0.7 million related to partially placing in-service 505 9th Street in the fourth quarter of 2007, approximately $1.3 million
related to placing Capital Gallery into service during the third quarter of 2006, and approximately $0.7 million was due to the placing in-service of Seven Cambridge Center in the first quarter of 2006 and 12290 Sunrise Valley in the second quarter
of 2006. The increase was offset by reductions in depreciation and amortization resulting from the sales of Democracy Center and 5 Times Square in 2007 compared with 280 Park Avenue in 2006, which resulted in an aggregate decrease of approximately
$15.3 million. Depreciation and amortization in the Same Property Portfolio increased approximately $3.8 million for the year ended December 31, 2007 compared to 2006.

Capitalized Costs

Costs directly related to the development of rental properties are not included in
our operating results. These costs are capitalized and included in real estate assets on our Consolidated Balance Sheets and amortized over their useful lives. Capitalized development costs include interest, wages, property taxes, insurance and
other project costs incurred during the period of development. Capitalized wages for the year ended December 31, 2007 and 2006 were $11.0 million and $7.0 million, respectively. These costs are not included in the general and administrative
expenses discussed above. Interest capitalized for the year ended December 31, 2007 and 2006 was $31.0 million and $5.9 million, respectively. These costs are not included in the interest expense referenced above.

Losses from Early Extinguishments of Debt

On
February 12, 2007, we refinanced our mortgage loan collateralized by 599 Lexington Avenue located in New York City. The new mortgage financing totaling $750.0 million bears interest at a fixed interest rate of 5.57% per annum and matures
on March 1, 2017. The net proceeds of the new loan were used to refinance the $225.0 million mortgage loan on 599 Lexington Avenue and the $475.0 million mortgage loan on Times Square Tower. In connection with the refinancing, the lien of the
Times Square Tower mortgage was spread to 599 Lexington Avenue and released from Times Square Tower so that Times Square Tower is no longer encumbered by any mortgage debt. There was no prepayment penalty associated with the repayment. We
recognized a loss from early extinguishment of debt totaling approximately $0.7 million consisting of the write-off of unamortized deferred financing costs.

In conjunction with the sale of Democracy Center in Bethesda, Maryland on August 7, 2007, we repaid the mortgage financing collateralized by the property totaling approximately $94.6 million. We paid a prepayment
fee of approximately $2.6 million associated with the repayment. We recognized a loss from early extinguishment of debt totaling approximately $2.7 million consisting of the prepayment fee and the write-off of unamortized deferred financing costs.

For the year ended December 31, 2006, in connection with the sale of 280 Park Avenue, we legally defeased the mortgage indebtedness
collateralized by the property, totaling approximately $254.4 million. In connection with the legal defeasance of the mortgage indebtedness at 280 Park Avenue, we recognized a loss from early extinguishment of debt totaling approximately $31.4
million consisting of the difference between the value of the U.S. Treasuries and the principal balance of the mortgage loan totaling approximately $28.2 million and the write-off of unamortized deferred financing costs totaling approximately $3.2
million. In addition, we repaid construction financing collateralized by our Seven Cambridge Center property. The construction financing at Seven Cambridge Center totaling approximately $112.5 million was repaid using approximately $7.5 million of
available cash and $105.0 million drawn under our Unsecured Line of Credit. There was no prepayment penalty associated with the repayment for Seven Cambridge Center. We recognized losses from early extinguishments of



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debt totaling approximately $0.5 million consisting of the write-off of unamortized deferred financing costs. We repaid the construction and permanent
financing at Capital Gallery totaling approximately $34.0 million and $49.7 million using available cash. We recognized a loss from early extinguishment of debt totaling approximately $0.2 million comprised of a prepayment penalty and the write-off
of unamortized deferred finance costs.

Income from unconsolidated joint ventures

For the year ended December 31, 2007, income from unconsolidated joint ventures decreased approximately $4.1 million. On June 1, 2007, our
Value-Added Fund sold Worldgate Plaza located in Herndon, Virginia for approximately $109.0 million. Worldgate Plaza is an office complex consisting of approximately 322,000 net rentable square feet. Net cash proceeds totaled approximately $50.5
million, of which our share was approximately $20.3 million, after the repayment of the mortgage indebtedness of $57.0 million. Our share of the gain, which is included as income from joint ventures, was approximately $15.5 million which amount
reflects the achievement of certain return thresholds as provided for in the joint venture agreement. On October 1, 2007, our 505 9th Street joint venture project, a 323,000 net rentable square foot Class A office property located in
Washington, D.C was partially placed in-service. In connection with partially placing this property in-service, we consolidated this entity as of October 1, 2007 due to the involvement we have in the venture once the property is operational.

On September 15, 2006, a joint venture in which we had a 35% interest sold 265 Franklin Street located in Boston, Massachusetts, at a
sale price of approximately $170.0 million. Net cash proceeds totaled approximately $108.3 million, of which our share was approximately $37.9 million, after the repayment of mortgage indebtedness of approximately $60.8 million and unfunded tenant
obligations and other closing costs of approximately $0.9 million. The venture recognized a gain on sale of real estate of approximately $51.4 million, of which our share was approximately $18.0 million, and a loss from early extinguishment of debt
of approximately $0.2 million, of which our share was $0.1 million.

Income from discontinued operations

For the years ended December 31, 2007 and 2006, Orbital Sciences Campus and Broad Run Business Park, Building E, Newport Office Park and Long Wharf
Marriott were included as part of income from discontinued operations.

Minority interests in property partnerships

Minority interests in property partnerships for the year ended December 31, 2007 consist of
the outside equity interests in the venture that owns our Wisconsin Place Office Property as well as our 505 9thStreet project. In connection with
partially placing 505 9thStreet in-service, we consolidated this entity as of October 1, 2007 due to the involvement we have in the venture
once the property is operational.

For the year ended December 31, 2006, minority interest in property partnership includes our
outside equity interest in Citigroup Center. This venture was consolidated with our financial results because we exercised control over the entity. Due to the redemption of the minority interest holder at Citigroup Center on May 31, 2006,
minority interest in property partnership no longer reflects an allocation to the minority interest holder.

Preferred distributions and allocation of undistributed earnings

Preferred distributions and Allocation of
Undistributed Earnings decreased approximately $7.8 million for the year ended December 31, 2007, compared to the year ended December 31, 2006. The decrease is due to an increase in the allocation of undistributed earnings of approximately
$4.6 million, offset by a decrease of approximately $12.4 million in preferred distributions. As a result of the special distribution declared in



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December 2007, we accrued approximately $8.7 million for the year ended December 31, 2007 related to the special cash distribution payable to holders of
the Series Two Preferred Units and have allocated earnings to the Series Two Preferred Units of approximately $8.7 million. In connection with the special distribution declared in December 2006, we recognized an adjustment of approximately $3.1
million in 2007 to the special cash distribution accrual and allocation of earnings to the Series Two Preferred Units, as a result of conversions of Series Two Preferred Units. This compares to approximately $12.2 million special in 2006.
The remaining decrease relates to a decrease in quarterly preferred distribution as a result of conversions.

Gains on sales of real estate

On August 7, 2007, we sold Democracy Center in Bethesda, Maryland, for approximately $280.5 million. Net cash proceeds totaled
approximately $184.5 million, after the repayment of the mortgage indebtedness of approximately $94.6 million and closing costs of approximately $1.4 million, resulting in a gain on sale of approximately $203.2 million. Due to our continuing
involvement through an agreement with the buyer to manage the property for a fee after the sale, this property has not been categorized as discontinued operations.

On February 15, 2007, we sold the long-term leasehold interest in 5 Times Square in New York City and related credits, for approximately $1.28 billion in cash. Net cash proceeds totaled approximately $1.23
billion, resulting in a gain on sale of approximately $736.2 million. Due to our continuing involvement through an agreement with the buyer to manage the property for a fee after the sale, this property has not been categorized as discontinued
operations.

On June 6, 2006, we sold 280 Park Avenue, a 1,179,000 net rentable square foot Class A office property located in
midtown Manhattan, New York, for approximately $1.2 billion. Net proceeds totaled approximately $875 million after legal defeasance of indebtedness secured by the property (consisting of approximately $254.4 million of principal indebtedness and
approximately $28.2 million of related defeasance costs) and the payment of transfer taxes, brokers fees and other customary closing costs. We recognized at closing a gain on sale of approximately $699.8 million. Due to our continuing
involvement through an agreement with the buyer to manage the property for a fee after the sale, this property has not been categorized as discontinued operations.

In January 2006, we recognized a $5.7 million gain on the sale of a parcel of land at the Prudential Center located in Boston, Massachusetts which had been accounted for previously as a financing transaction. During
January 2006, the transaction qualified as a sale for financial reporting purposes.

Gains on sales of real estate from discontinued operations

On November 20, 2007, the Company sold its Orbital Sciences Campus and Broad Run Business Park, Building E properties located
in Loudon County, Virginia, for approximately $126.7 million. The Orbital Sciences Campus and Broad Run Business Park, Building E properties are comprised of three Class A office properties aggregating approximately 337,000 net rentable square
feet and an office/technical property totaling approximately 127,000 net rentable square feet, respectively. Net cash proceeds totaled approximately $125.4 million, resulting in a gain on sale of approximately $58.2 million.

On April 5, 2007, we sold Newport Office Park, an approximately 172,000 net rentable square foot Class A office property located in Quincy,
Massachusetts, for approximately $37.0 million. Net cash proceeds totaled approximately $33.7 million, resulting in a gain on sale of approximately $14.3 million.

On March 23, 2007, we completed the sale of the Long Wharf Marriott, a 402-room hotel located in Boston, Massachusetts for a total sale price of $231.0 million, or approximately $575,000 per room. The net gain on
sale was approximately $194.4 million.



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Liquidity and Capital Resources

General

Our principal liquidity needs for the next twelve months and beyond are to:



| |  |  | fund normal recurring expenses;
| | - |  | -------------------------------



| |  |  | meet debt service and principal repayment obligations, including balloon payments on maturing debt;
| | - |  | ---------------------------------------------------------------------------------------------------



| |  |  | fund capital expenditures, including major renovations, tenant improvements and leasing costs;
| | - |  | ----------------------------------------------------------------------------------------------



| |  |  | fund development costs;
| | - |  | -----------------------



| |  |  | fund possible property acquisitions; and
| | - |  | ----------------------------------------



| |  |  | make the minimum distribution required to enable Boston Properties, Inc. to maintain its REIT qualification under the Internal Revenue Code of 1986, as amended.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------

We expect to satisfy these needs using one or more of the following:



| |  |  | construction loans;
| | - |  | -------------------



| |  |  | long-term secured and unsecured indebtedness (including unsecured exchangeable indebtedness);
| | - |  | ---------------------------------------------------------------------------------------------



| |  |  | cash flow from operations;
| | - |  | --------------------------



| |  |  | distribution of cash flows from joint ventures;
| | - |  | -----------------------------------------------



| |  |  | cash and cash equivalent balances;
| | - |  | ----------------------------------



| |  |  | sales of real estate;
| | - |  | ---------------------



| |  |  | issuances of additional common units and/or preferred units; and
| | - |  | ----------------------------------------------------------------



| |  |  | our Unsecured Line of Credit or other short-term bridge facilities.
| | - |  | -------------------------------------------------------------------

We believe that our liquidity needs will be satisfied using our cash on hand, cash flows generated by operations, availability under our Unsecured Line of Credit and cash flows provided by other financing activities.
We draw on multiple financing sources to fund our long-term capital needs. Our Unsecured Line of Credit is utilized primarily as a bridge facility to fund acquisition opportunities, to refinance outstanding indebtedness and to meet short-term
development and working capital needs. We generally fund our development projects with construction loans, which we may partially guarantee, until project completion or lease-up thresholds are achieved.

Contractual rental revenue, recovery income from tenants, other income from operations, available cash balances, draws on our Unsecured Line of Credit
and refinancing of maturing indebtedness are our principal sources of capital used to pay operating expenses, debt service, recurring capital expenditures and the minimum distribution required to enable Boston Properties, Inc. to maintain its REIT
qualification. We seek to increase income from our existing properties by maintaining quality standards for our properties that promote high occupancy rates and permit increases in rental rates while reducing tenant turnover and controlling
operating expenses. Our sources of revenue also include third-party fees generated by our office real estate management, leasing, development and construction businesses. Consequently, we believe our revenue, together with proceeds from financing
activities, will continue to provide the necessary funds for our short-term liquidity needs.

Material changes in these factors may
adversely affect our net cash flows. Such changes, in turn, could adversely affect our ability to fund distributions, debt service payments and tenant improvements. In addition, a material adverse change in our cash provided by operations may affect
our ability to comply with the financial performance covenants under our Unsecured Line of Credit and unsecured senior notes.



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The credit markets continue to be extremely constrained in the real estate sector, as lenders are
primarily focusing on refinancing or restructuring existing loans. Lenders are taking relatively little underwriting risk, the amount of capital they are willing to commit has decreased and the underwriting standards that they are employing have
become increasingly conservative.

We have approximately $251 million of debt
maturities in 2009. The largest is approximately $183 million where we have two one-year extension options and expect to exercise the first extension option in 2009. The other two loans are with life insurance companies, and at conservative loan to
value ratios and we expect to refinance or replace them at maturity. In 2010, we have debt maturities totaling approximately $238 million and our unconsolidated joint ventures have debt maturities totaling approximately $670 million (of which our
share is approximately $397 million). All of these loans are secured mortgages. The two largest maturities are loans on 125 West 55thStreet and Two
Grand Central Tower, and we anticipate a reduced loan amount as part of the refinancing of these assets. The remaining loans are moderately leveraged mortgages on stabilized properties where we expect to be able to refinance the existing loan
amounts. We intend to be proactive requesting financing bids on these and other stable assets and anticipate completing additional financings during 2009. The remainder of our capital commitments over the next few years are to fund our development
program.

In total our remaining capital requirements, net of interest and anticipated fundings from existing construction loans, to
complete our ongoing developments is $822.9 million, through the end of 2012. With our cash, availability under our Unsecured Line of Credit, and the anticipated cash flow generated by the operating portfolio, we believe we have sufficient capacity
to fund the entire program. In addition, we expect to arrange supplementary construction facilities on a number of these projects as we move through 2009 to create additional liquidity. For more detail on properties under construction, see page 5.

Finally, in recent years, we have been an active seller of real estate assets and, although we will consider additional asset sales, we do
not expect our sales volume to be comparable to that of prior years.

REIT Tax Distribution Considerations

Distributions

Because capital may
continue to be constrained, we are also evaluating the appropriate amount and form of payment of distributions for 2009. A REIT is subject to a number of organizational and operational requirements, including a requirement that it currently
distribute at least 90% of its annual taxable income. Boston Properties, Inc.s policy is to distribute at least 100% of its taxable income to avoid paying federal tax. Our last four regular quarterly distributions totaled an aggregate of
approximately $385 million. Under the applicable REIT regulations, Boston Properties, Inc. can apply the fourth quarter 2008 distribution (which was declared on December 31, 2008 and paid on January 31, 2009), in whole or in part, to
satisfy its 2009 minimum REIT distribution requirements. If Boston Properties, Inc. chooses to apply the entire amount, we could reduce the amount of distributions necessary to enable Boston Properties, Inc. to satisfy its 2009 minimum REIT
distributions by approximately $97 million. In addition, as a result of a temporary Revenue Procedure recently issued by the Internal Revenue Service, Boston Properties, Inc., like many other REITs, is also evaluating the financial, legal and tax
implications (on both Boston Properties, Inc. stockholders and holders of our partnership interests) of issuing equity in lieu of a portion of our regular cash distribution. We continue to consider the advantages and disadvantages of reducing our
cash distributions and/or issuing equity in lieu of a portion of our cash distributions in light of the current state of the capital markets, Boston Properties, Inc.s current stock price and other factors.



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Sales

To the extent that we sell assets and cannot efficiently use the proceeds for either our development activities or attractive acquisitions, we would, at the appropriate time, decide whether it is better to declare a
special distribution, adopt a stock repurchase program, reduce our indebtedness or retain the cash for future investment opportunities. Such a decision will depend on many factors including, among others, the timing, availability and terms of
development and acquisition opportunities, our then-current and anticipated leverage, the price of Boston Properties, Inc.s common stock and REIT distribution requirements. At a minimum, we expect that we would distribute at least that amount
of proceeds necessary for Boston Properties, Inc. to avoid paying corporate level tax on the applicable gains realized from any asset sales.

On December 17, 2007, Boston Properties, Inc., as our general partner, declared a special cash distribution of $5.98 per common unit and LTIP Unit that was paid on January 30, 2008 to unitholders of record as of the close of
business on December 31, 2007. The decision to declare a special distribution was the result of the sales of assets in 2007, including 5 Times Square, Orbital Sciences Campus, Broad Run Business ParkBuilding E, Worldgate Plaza and Newport
Office Park.

Cash Flow Summary

The following summary discussion of our cash flows is based on the consolidated statements of cash flows in Item 8. Financial Statements and Supplementary Data and is not meant to be an all-inclusive discussion of the changes in
our cash flows for the periods presented below.

Cash and cash equivalents were $0.2 billion and $1.5 billion at December 31, 2008 and
December 31, 2007, respectively, representing a decrease of $1.3 billion. The cash and cash equivalents balance as of February 23, 2009 was approximately $51 million. The decrease was a result of the following decreases in cash flows:



|                                                    |  |                          |            |   |      |   |          |                    |  |   |            |  
|--------------------------------------------------- |  | ------------------------ | ---------- | - | ---- | - | -------- | ------------------ |  | - | ---------- | -
|                                                    |  | Years ended December 31, |           
|                                                    |  | 2008                     |            |   | 2007 |   |          | Increase(Decrease) | 
|                                                    |  | (in thousands)           |           
|Net cash provided by operating activities           |  | $                        | 560,908    |   |      | $ | 629,378  |                    |  | $ | (68,470    | )
|Net cash provided by (used in) investing activities |  | $                        | (1,315,676 | ) |      | $ | 576,931  |                    |  | $ | (1,892,607 | )
|Net cash used in financing activities               |  | $                        | (510,643   | ) |      | $ | (425,176 | )                  |  | $ | (85,467    | )

Our principal source of cash flow is related to the operation of our office properties. The
average term of our tenant leases is approximately 7.2 years with portfolio occupancy rates historically in the range of 92% to 98%. Our properties provide a relatively consistent stream of cash flow that provides us with resources to pay operating
expenses, debt service and fund quarterly dividend and distribution payment requirements. In addition, over the past three years, we have raised capital through the sale of some of our properties and raised capital from secured and unsecured
borrowings.

In 2008, our total distributions exceeded our cash flow from operating activities due to the special distribution which was
declared in December 2007 and paid to common unitholders and LTIP holders in January 2008. The cash flows distributed were generated from sales of real estate assets and proceeds from the sales are included as part of cash flows from investment
activities. Distributions will generally exceed cash flows from operating activities during periods in which we sell significant real estate assets and distribute gains on sale that would otherwise be taxable.



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Cash is used in investing activities to fund acquisitions, development and recurring and nonrecurring
capital expenditures. We selectively invest in new projects that enable us to take advantage of our development, leasing, financing and property management skills and invest in existing buildings that meet our investment criteria. Cash used in
investing activities for the year ended December 31, 2008 consisted of the following:



|                                                                         |  |                |            |  
|------------------------------------------------------------------------ |  | -------------- | ---------- | -
|                                                                         |  | (in thousands) |           
|Net proceeds from the sales of real estate and other assets              |  | $              | 127,307    |  
|Proceeds from note receivable                                            |  |                | 123,000    |  
|Proceeds from redemptions of investments in securities                   |  |                | 14,697     |  
|Net proceeds from the sale/financing of real estate released from escrow |  |                | 161,321    |  
|The cash provided by these investing activities is offset by:            |  |                |            |  
|Net investments in unconsolidated joint ventures                         |  |                | (896,027   | )
|Issuance of note receivable                                              |  |                | (270,000   | )
|Acquisitions/additions to real estate                                    |  |                | (575,974   | )
|                                                                         |  |                |            |  
|Net cash used in investing activities                                    |  | $              | (1,315,676 | )
|                                                                         |  |                |            |  

Cash used in financing activities for the year ended December 31, 2008 totaled approximately
$510.6 million. This consisted primarily of the distribution to our unitholders, including the special cash distribution of $5.98 per share paid in January 2008, net repayment of mortgage notes payable, offset by the borrowings under our Unsecured
Line of Credit and the offering of our 3.625% exchangeable senior notes due 2014. Future debt payments are discussed below under the heading Debt Financing.

Capitalization

At December 31, 2008, our total consolidated debt was approximately $6.3
billion. The GAAP weighted-average annual interest rate on our consolidated indebtedness was 5.25% and the weighted-average maturity was approximately 5.1 years.

Consolidated debt to total consolidated market capitalization ratio, defined as total consolidated debt as a percentage of the market value of our outstanding equity securities plus our total consolidated debt, is a
measure of leverage commonly used by analysts in the REIT sector. Our total consolidated market capitalization was approximately $14.2 billion at December 31, 2008. Total consolidated market capitalization was calculated using the
December 31, 2008 closing stock price of $55.00 per common share of Boston Properties, Inc. and the following: (1) 141,089,725 outstanding common units of limited partnership (including 121,180,655 common units held by Boston Properties,
Inc.), (2) an aggregate of 1,460,688 common units issuable upon conversion of all outstanding Series Two Preferred Units of partnership interest, (3) an aggregate of 946,509 common units issuable upon conversion of all outstanding LTIP
Units, assuming all conditions have been met for the conversion of the LTIP Units, and (4) our consolidated debt totaling approximately $6.3 billion. The calculation of total consolidated market capitalization does not include 1,080,938 2008
OPP Awards because, unlike other LTIP Units, they are not earned until certain return thresholds are achieved. Our total consolidated debt, which excludes debt collateralized by our unconsolidated joint ventures, at December 31, 2008
represented approximately 44.28% of our total consolidated market capitalization. This percentage will fluctuate with changes in the value of our common units and therefore with changes in the value of Boston Properties, Inc.s common stock and
does not necessarily reflect our capacity to incur additional debt to finance our activities or our ability to manage our existing debt obligations. However, for a company like ours, whose assets are primarily income-producing real estate, the
consolidated debt to total consolidated market capitalization ratio may provide investors with an alternate indication of leverage, so long as it is evaluated along with other financial ratios and the various components of our outstanding
indebtedness.

For a discussion of our unconsolidated joint venture indebtedness, see Off Balance Sheet Arrangements  Joint
Venture Indebtedness.



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##### Table of Contents

Debt Financing

As of December 31, 2008, we had approximately $6.3 billion of outstanding consolidated indebtedness, representing 44.28% of our total consolidated market capitalization as calculated above consisting of
(1) $1.472 billion (net of discount) in publicly traded unsecured debt having a weighted-average interest rate of 6.03% per annum and maturities in 2013 and 2015; (2) $450 million of exchangeable senior notes having an interest rate
of 3.75% per annum (an effective rate of 3.787% per annum), an initial optional redemption date in 2013 and maturity in 2036; (3) $848.4 million (net of discount) of exchangeable senior notes having an interest rate of 2.875% per
annum (an effective rate of 3.462% per annum) having an initial optional redemption in 2012 and maturing in 2037; (4) $740.5 million (net of discount) of exchangeable senior notes having an interest rate of 3.625% per annum (an
effective rate of 4.037%) having an initial optional redemption and maturity in 2014; (5) $2.7 billion of property-specific mortgage debt having a GAAP weighted-average interest rate of 6.33% per annum and weighted-average term of 5.1
years; and (6) $100.0 million drawn on our Unsecured Line of Credit. The table below summarizes our outstanding consolidated indebtedness at December 31, 2008 and 2007:



|                                                      |  |                        |           |   |      |   |           |  
|----------------------------------------------------- |  | ---------------------- | --------- | - | ---- | - | --------- | -
|                                                      |  | December 31,           |          
|                                                      |  | 2008                   |           |   | 2007 |  
|                                                      |  | (dollars in thousands) |          
|DEBT SUMMARY:                                         |  |                        |           |   |      |   |           |  
|Balance                                               |  |                        |           |   |      |   |           |  
|Fixed rate                                            |  | $                      | 5,886,424 |   |      | $ | 5,369,243 |  
|Variable rate                                         |  |                        | 385,492   |   |      |   | 122,923   |  
|                                                      |  |                        |           |   |      |   |           |  
|Total                                                 |  | $                      | 6,271,916 |   |      | $ | 5,492,166 |  
|                                                      |  |                        |           |   |      |   |           |  
|Percent of total debt:                                |  |                        |           |   |      |   |           |  
|Fixed rate                                            |  |                        | 93.85     | % |      |   | 97.76     | %
|Variable rate                                         |  |                        | 6.15      | % |      |   | 2.24      | %
|                                                      |  |                        |           |   |      |   |           |  
|Total                                                 |  |                        | 100.00    | % |      |   | 100.00    | %
|                                                      |  |                        |           |   |      |   |           |  
|GAAP Weighted average interest rate at end of period: |  |                        |           |   |      |   |           |  
|Fixed rate                                            |  |                        | 5.36      | % |      |   | 5.58      | %
|Variable rate                                         |  |                        | 3.62      | % |      |   | 6.11      | %
|                                                      |  |                        |           |   |      |   |           |  
|Total                                                 |  |                        | 5.25      | % |      |   | 5.60      | %
|                                                      |  |                        |           |   |      |   |           |  

The variable rate debt shown above bears interest based on various spreads over the London
Interbank Offered Rate (LIBOR) or Eurodollar rates. As of December 31, 2008, the weighted average interest rate on our variable rate debt was LIBOR/Eurodollar plus 0.97% per annum. During 2007, we entered into an interest rate
swap contract to fix the one-month LIBOR index rate at 4.57% per annum on a notional amount of $96.7 million. The swap contract went into effect on October 22, 2007 and expired on October 29, 2008.

Unsecured Line of Credit

On
June 6, 2008, we utilized an accordion feature under our Unsecured Line of Credit with a consortium of lenders to increase the total commitment under the Unsecured Line of Credit from $605.0 million to $923.3 million. On July 21, 2008, we
further increased the total commitment to $1.0 billion. All other material terms under the facility remain unchanged. Our Unsecured Line of Credit bears interest at a variable interest rate equal to Eurodollar plus 0.475% per annum and matures
on August 3, 2010, with a provision for a one-year extension at our option, subject to certain conditions. There can be no assurance that we will be able to renew and or replace the Unsecured Line of Credit upon maturity on favorable terms
(including the lenders total commitment) or at all. The Unsecured Line of Credit is a recourse obligation of BPLP. Under the Unsecured Line of Credit, a facility fee equal to 0.125% per annum is payable in quarterly installments. The
interest rate and facility fee are subject to adjustment in the event of a change in our unsecured debt ratings. The Unsecured Line of Credit involves a syndicate of lenders. The Unsecured Line of Credit contains a competitive bid option that allows
banks that are part of the lender consortium to bid to make loan advances to us at a negotiated LIBOR-based rate.



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Our ability to borrow under our Unsecured Line of Credit is subject to our compliance with a number of
customary financial and other covenants on an ongoing basis, including:



| |  |  | a leverage ratio not to exceed 60%, however the leverage ratio may increase to no greater than 65% provided that it is reduced back to 60% within 180 days;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | a secured debt leverage ratio not to exceed 55%;
| | - |  | ------------------------------------------------



| |  |  | a fixed charge coverage ratio of at least 1.40;
| | - |  | -----------------------------------------------



| |  |  | an unsecured leverage ratio not to exceed 60%, however the leverage ratio may increase to no greater than 65% provided that it is reduced back to 60% within 180
days;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | a minimum net worth requirement;
| | - |  | --------------------------------



| |  |  | an unsecured debt interest coverage ratio of at least 1.75; and
| | - |  | ---------------------------------------------------------------



| |  |  | limitations on permitted investments.
| | - |  | -------------------------------------

We believe we are in compliance with the financial and other covenants listed above.

As of December 31, 2008, we had
borrowings of $100.0 million and letters of credit totaling $15.6 million outstanding under the Unsecured Line of Credit, with the ability to borrow $884.4 million. As of February 23, 2009, we had borrowings of $100.0 million and letters of
credit totaling $15.7 million outstanding under the Unsecured Line of Credit, with the ability to borrow $884.3 million.

Unsecured
Senior Notes

The following summarizes the unsecured senior notes outstanding as of December 31, 2008 (dollars in thousands):



|                               |  |                    |   |  |                  |   |  |                 |           |   |                  |                 
|------------------------------ |  | ------------------ | - |  | ---------------- | - |  | --------------- | --------- | - | ---------------- | ----------------
|                               |  | Coupon/Stated Rate |   |  | EffectiveRate(1) |   |  | PrincipalAmount |           |   | Maturity Date(2)
|10 Year Unsecured Senior Notes |  | 6.250              | % |  | 6.381            | % |  | $               | 750,000   |   |                  | January 15, 2013
|10 Year Unsecured Senior Notes |  | 6.250              | % |  | 6.291            | % |  |                 | 175,000   |   |                  | January 15, 2013
|12 Year Unsecured Senior Notes |  | 5.625              | % |  | 5.693            | % |  |                 | 300,000   |   |                  | April 15, 2015  
|12 Year Unsecured Senior Notes |  | 5.000              | % |  | 5.194            | % |  |                 | 250,000   |   |                  | June 1, 2015    
|                               |  |                    |   |  |                  |   |  |                 |           |   |                  |                 
|Total principal                |  |                    |   |  |                  |   |  |                 | 1,475,000 |   |                  |                 
|Net discount                   |  |                    |   |  |                  |   |  |                 | (2,625    | ) |                  |                 
|                               |  |                    |   |  |                  |   |  |                 |           |   |                  |                 
|Total                          |  |                    |   |  |                  |   |  | $               | 1,472,375 |   |                  |                 
|                               |  |                    |   |  |                  |   |  |                 |           |   |                  |                 



|(1) | Yield on issuance date including the effects of discounts on the notes.
|--- | -----------------------------------------------------------------------

|(2) | No principal amounts are due prior to maturity.
|--- | -----------------------------------------------

Our
unsecured senior notes are redeemable at our option, in whole or in part, at a redemption price equal to the greater of (1) 100% of their principal amount or (2) the sum of the present value of the remaining scheduled payments of principal
and interest discounted at a rate equal to the yield on U.S. Treasury securities with a comparable maturity plus 35 basis points (or 25 basis points in the case of the $250 million 12 Year Unsecured Senior Notes that mature on June 1, 2015), in
each case plus accrued and unpaid interest to the redemption date. The indenture under which our senior unsecured notes were issued contains restrictions on incurring debt and using our assets as security in other financing transactions and other
customary financial and other covenants, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of 1.5, and (4) unencumbered asset value to be no less
than 150% of our unsecured debt. As of December 31, 2008, we were in compliance with each of these financial restrictions and requirements.



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The investment grade ratings on our senior unsecured notes are as follows:



|                    |  |              
|------------------- |  | -------------
|Rating Organization |  | Rating       
|Moodys             |  | Baa2 (stable)
|Standard & Poors   |  | A- (negative)
|FitchRatings        |  | BBB (stable) 

The security rating is not a recommendation to buy, sell or hold securities, as it may be subject
to revision or withdrawal at any time by the rating organization. Each rating should be evaluated independently of any other rating.

Unsecured
exchangeable senior notes

The following summarizes the unsecured exchangeable senior notes outstanding as of December 31, 2008
(dollars in thousands):



|                                 |  |                    |   |  |                  |   |  |              |     |  |                 |           |   |                                         |                   |               |                  
|-------------------------------- |  | ------------------ | - |  | ---------------- | - |  | ------------ | --- |  | --------------- | --------- | - | --------------------------------------- | ----------------- | ------------- | -----------------
|                                 |  | Coupon/Stated Rate |   |  | EffectiveRate(1) |   |  | ExchangeRate |     |  | PrincipalAmount |           |   | First OptionalRedemption Date byCompany |                   | Maturity Date
|3.625% Exchangeable Senior Notes |  | 3.625              | % |  | 4.037            | % |  | 8.5051       | (2) |  | $               | 747,500   |   |                                         | N/A               |               | February 15, 2014
|2.875% Exchangeable Senior Notes |  | 2.875              | % |  | 3.462            | % |  | 7.0430       | (3) |  |                 | 862,500   |   |                                         | February 20, 2012 |               | February 15, 2037
|3.750% Exchangeable Senior Notes |  | 3.750              | % |  | 3.787            | % |  | 10.0066      | (4) |  |                 | 450,000   |   |                                         | May 18, 2013      |               | May 15, 2036     
|                                 |  |                    |   |  |                  |   |  |              |     |  |                 |           |   |                                         |                   |               |                  
|Total principal                  |  |                    |   |  |                  |   |  |              |     |  |                 | 2,060,000 |   |                                         |                   |               |                  
|Net discount                     |  |                    |   |  |                  |   |  |              |     |  |                 | (21,101   | ) |                                         |                   |               |                  
|                                 |  |                    |   |  |                  |   |  |              |     |  |                 |           |   |                                         |                   |               |                  
|Total                            |  |                    |   |  |                  |   |  |              |     |  | $               | 2,038,899 |   |                                         |                   |               |                  
|                                 |  |                    |   |  |                  |   |  |              |     |  |                 |           |   |                                         |                   |               |                  



|(1) | Yield on issuance date including the effects of discounts on the notes.
|--- | -----------------------------------------------------------------------

|(2) | The initial exchange rate is 8.5051 shares per $1,000 principal amount of the notes (or an initial exchange price of approximately $117.58 per share of Boston Properties,
Inc.s common stock). In addition, we entered into capped call transactions with affiliates of certain of the initial purchasers, which are intended to reduce the potential dilution upon future exchange of the notes. The capped call
transactions are expected to have the effect of increasing the effective exchange price to us of the notes from $117.58 to approximately $137.17 per share, representing an overall effective premium of approximately 40% over the closing price on
August 13, 2008 of $97.98 per share of Boston Properties, Inc.s common stock. The net cost of the capped call transactions was approximately $44.4 million.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | In connection with the special distribution of $5.98 per share of Boston Properties, Inc.s common stock declared on December 17, 2007, the exchange rate was adjusted from
6.6090 to 7.0430 shares per $1,000 principal amount of notes effective as of December 31, 2007, resulting in an exchange price of approximately $141.98 per share of Boston Properties, Inc.s common stock.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(4) | In connection with the special distribution of $5.98 per share of Boston Properties, Inc.s common stock declared on December 17, 2007, the exchange rate was adjusted from
9.3900 to 10.0066 shares per $1,000 principal amount of notes effective as of December 31, 2007, resulting in an exchange price of approximately $99.93 per share of Boston Properties, Inc.s common stock.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

3.625% Exchangeable Senior Notes due 2014

On
August 19, 2008, we completed an offering of $747.5 million in aggregate principal amount (including $97.5 million as a result of the exercise by the initial purchasers of their over-allotment option) of our 3.625% exchangeable senior notes due
2014. The notes were priced at 99.0% of their face amount, resulting in aggregate



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net proceeds to us, after deducting the initial purchasers discounts and offering expenses, of approximately $731.6 million, resulting in an effective
interest rate of approximately 4.037% per annum. The notes mature on February 15, 2014, unless earlier repurchased, exchanged or redeemed.

On and after January 1, 2014, the notes will be exchangeable at any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date at the option of the holders
into cash up to their principal amount and, at our option, cash or shares of Boston Properties, Inc.s common stock for the remainder, if any, of the exchange value in excess of such principal amount at the applicable exchange rate, which
initially equals 8.5051 shares of Boston Properties, Inc.s common stock per $1,000 principal amount of the notes (equivalent to an exchange price of approximately $117.58 per share of Boston Properties, Inc.s common stock) and is subject
to adjustment in certain circumstances. The initial exchange price of approximately $117.58 per share of Boston Properties, Inc.s common stock represents an approximately 20% premium to the closing price of Boston Properties, Inc.s
common stock on the New York Stock Exchange on August 13, 2008 of $97.98 per share. Prior to the close of business on the scheduled trading day immediately preceding January 1, 2014, holders of the notes may only exchange their notes at
their option under the following circumstances: (1) during the five business day period after any 10 consecutive trading day period (the measurement period) in which the trading price per $1,000 principal amount of notes for each
trading day of that measurement period was less than 98% of the product of the last reported sale price of Boston Properties, Inc.s common stock and the exchange rate on each such day; (2) during any fiscal quarter beginning after the
fiscal quarter ended September 30, 2008 if the last reported sale price of Boston Properties, Inc.s common stock for each of at least 20 trading days in the 30 consecutive trading days ending on, and including, the last day of the
preceding fiscal quarter is more than 130% of the applicable exchange price for the notes on the last day of such preceding fiscal quarter; (3) if we have called such notes for redemption to preserve Boston Properties, Inc.s status as a
real estate investment trust and the redemption has not yet occurred; (4) in connection with specified corporate transactions, including a fundamental change; or (5) if Boston Properties, Inc.s common stock is delisted. The notes may
be accelerated upon an event of default as described in Supplemental Indenture No. 7.

If we undergo a fundamental change, holders of
the notes will have the option to require us to purchase all or any portion of the notes at a purchase price equal to 100% of the principal amount of the notes to be purchased plus any accrued and unpaid interest to, but excluding, the fundamental
change repurchase date. We will pay cash for all notes so repurchased. The holders of the notes will have the right to exchange their notes at their option in connection with a fundamental change, and, if a fundamental change occurs, the exchange
rate may be increased by up to 1.7011 shares of Boston Properties, Inc.s common stock per $1,000 principal amount of the notes, subject to adjustment in certain circumstances, for a holder who elects to exchange its notes in connection with
the fundamental change. The number of additional shares by which the exchange rate will be increased will be determined by reference to a table included in Supplemental Indenture No. 7, based on the date on which the fundamental change occurs
or becomes effective and the price paid per share of Boston Properties, Inc.s common stock in the transaction or event that constitutes such fundamental change. A fundamental change will be deemed to occur upon the consummation of
any transaction or event (whether by means of an exchange offer, liquidation, tender offer, consolidation, merger, combination, reclassification, recapitalization or otherwise) in connection with which more than 50% of Boston Properties, Inc.s
common stock is exchanged for, converted into, acquired for or constitutes solely the right to receive, consideration which is not at least 90% common stock (or American Depositary Shares representing shares of common stock) that is either
(1) listed on, or immediately after consummation of such transaction or event will be listed on, a United States national securities exchange; or (2) approved, or immediately after the transaction or event will be approved, for listing or
quotation on any United States system of automated dissemination of quotations of securities prices similar to a United States national securities exchange.

The notes are senior unsecured obligations of us and rank equally in right of payment to all existing and future senior unsecured indebtedness and senior in right of payment to any future subordinated indebtedness of
us. The notes effectively rank junior in right of payment to all existing and future secured indebtedness of us to the extent of the value of the collateral securing such indebtedness. The notes are structurally subordinated to all liabilities of
the subsidiaries of us.



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In connection with the closing, we and Boston Properties, Inc. entered into a Registration Rights
Agreement with the initial purchasers. Under the Registration Rights Agreement, we and Boston Properties, Inc. have agreed, for the benefit of the holders of the notes, to register the resale of the Boston Properties, Inc.s common stock, if
any, issued upon exchange of the notes on a shelf registration statement filed with the Securities and Exchange Commission. We and Boston Properties, Inc. may be required to pay liquidated damages of up to 0.50% per annum of additional interest
to the holders of the notes if we and Boston Properties, Inc. fail to meet certain deadlines or take certain actions relating to the registration of Boston Properties, Inc.s common stock issuable upon exchange of the notes. Neither we nor
Boston Properties, Inc. will be required to pay liquidated damages with respect to any note after it has been exchanged. Additionally, pursuant to Supplemental Indenture No. 7, to the extent that any shares of Boston Properties, Inc.s
common stock issued upon exchange of the notes are not covered by a resale registration statement that is effective on the date of the exchange and certain other conditions have been met, we must deliver 0.03 additional shares of Boston Properties,
Inc.s common stock upon exchange of the notes for each of such shares.

In connection with the sale of the notes, we and Boston
Properties, Inc. also entered into capped call transactions (together, the Capped Call Transaction) with affiliates of certain of the initial purchasers (Bank of America, N.A., Deutsche Bank AG, JPMorgan and Morgan Stanley) (the
Option Counterparties). Pursuant to the Capped Call Transaction, we will have the right to cause the Option Counterparties to deliver shares of Boston Properties, Inc.s common stock to us upon exchange of the notes if the value per
share of Boston Properties, Inc.s common stock, as measured under the terms of the Capped Call Transaction, at the time of settlement exceeds an initial strike price of approximately $117.58 per share, subject to certain adjustments similar to
those contained in the notes. The Capped Call Transaction is intended to reduce the potential dilution upon future exchange of the notes in the event that the market value per share of Boston Properties, Inc.s common stock, as measured under
the terms of the Capped Call Transaction, at the time of settlement is greater than the strike price of the Capped Call Transaction. If the market value per share of Boston Properties, Inc.s common stock, as measured under the terms of the
Capped Call Transaction, at the time of settlement exceeds the cap price of the Capped Call Transaction (which is initially equal to approximately $137.17 per share), the dilution mitigation will be limited and there would be dilution to the extent
that the market value per share of Boston Properties, Inc.s common stock exceeds the cap price. The Capped Call Transaction is expected to have the effect of increasing the effective exchange price to us of the notes to the cap price of the
Capped Call Transaction, which represents an initial effective premium of approximately 40% over the closing price of Boston Properties, Inc.s common stock on the New York Stock Exchange on August 13, 2008 of $97.98 per share. The Capped
Call Transaction comprises separate contracts entered into by us and Boston Properties, Inc. and with the Option Counterparties and is not part of the terms of the notes and will not affect the holders rights under the notes. The net cost of
the Capped Call Transaction was approximately $44.4 million, which was recorded as a reduction to partners capital.

2.875% Exchangeable Senior
Notes due 2037

On February 6, 2007, we completed an offering of $862.5 million in aggregate principal amount (including $112.5
million as a result of the exercise by the initial purchasers of their over-allotment option) of our 2.875% exchangeable senior notes due 2037. The notes were priced at 97.433333% of their face amount, resulting in an effective interest rate of
approximately 3.438% per annum and net proceeds to us of approximately $840.0 million. The notes mature on February 15, 2037, unless earlier repurchased, exchanged or redeemed.

Upon the occurrence of specified events, holders of the notes may exchange their notes prior to the close of business on the scheduled trading day
immediately preceding February 20, 2012 into cash and, at our option, shares of Boston Properties, Inc.s common stock at an exchange rate of 7.0430 shares per $1,000 principal amount of notes (or an exchange price of approximately $141.98
per share of Boston Properties, Inc.s common stock). In connection with the special distribution declared on December 17, 2007, the initial exchange rate of 6.6090 was adjusted to 7.0430 shares per $1,000 principal amount of notes
effective as of December 31, 2007, resulting in an exchange price of approximately $141.98 per share of Boston Properties, Inc.s common stock.



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On and after February 20, 2012, the notes will be exchangeable at any time prior to the close of business on the scheduled trading day immediately
preceding the maturity date at the option of the holder at the applicable exchange rate. The initial exchange rate is subject to adjustment in certain circumstances.

Prior to February 20, 2012, we may not redeem the notes except to preserve Boston Properties, Inc.s status as a REIT. On or after February 20, 2012, we may redeem all or a portion of the notes for cash
at a redemption price equal to 100% of the principal amount plus accrued and unpaid interest. Note holders may require us to repurchase all or a portion of the notes on February 15 of 2012, 2017, 2022, 2027 and 2032 at a purchase price equal to
100% of the principal amount plus accrued and unpaid interest up to, but excluding, the repurchase date. We will pay cash for all notes so repurchased.

If we undergo a fundamental change, note holders will have the option to require us to purchase all or any portion of the notes at a purchase price equal to 100% of the principal amount of the notes to be
purchased plus any accrued and unpaid interest to, but excluding, the fundamental change purchase date. We will pay cash for all notes so purchased. In addition, if a fundamental change occurs prior to February 20, 2012, we will increase the
exchange rate for a holder who elects to exchange its notes in connection with such a fundamental change under certain circumstances.

In
connection with the closing, we and Boston Properties, Inc. entered into a Registration Rights Agreement with the initial purchasers, under which we agreed, for the benefit of the holders of the notes, to file with the Securities and Exchange
Commission and maintain a shelf registration statement providing for the sale by the holders of the notes and Boston Properties, Inc.s common stock, if any, issuable upon exchange of the notes. We will be required to pay liquidated damages in
the form of specified additional interest to the holders of the notes if we fail to comply with these obligations; provided that we will not be required to pay liquidated damages with respect to any note after it has been exchanged for any of Boston
Properties, Inc.s common stock. On March 13, 2007, we and Boston Properties, Inc. filed with the SEC a registration statement covering the resale of the notes and shares of Boston Properties, Inc.s common stock issuable upon
exchange of the notes. The registration statement was declared effective by the SEC on April 20, 2007.

3.75% Exchangeable Senior Notes due 2036

On April 6, 2006, we completed a public offering of $400 million in aggregate principal amount of our 3.75% exchangeable senior
notes due 2036. On May 2, 2006, we issued an additional $50 million aggregate principal amount of the notes as a result of the exercise by the underwriter of our over-allotment option. The notes mature on May 15, 2036, unless earlier
repurchased, exchanged or redeemed.

Upon the occurrence of specified events, holders of the notes may exchange their notes prior to the
close of business on the scheduled trading day immediately preceding May 18, 2013 into cash and, at our option, shares of Boston Properties, Inc.s common stock at an exchange rate of 10.0066 shares per $1,000 principal amount of notes (or
an exchange price of approximately $99.93 per share of Boston Properties, Inc. common stock). The initial exchange rate of 8.9461 shares per $1,000 principal amount of notes and the initial exchange price of approximately $111.78 per share of Boston
Properties, Inc.s common stock were adjusted to 9.3900 and $106.50, respectively, effective as of December 29, 2006 in connection with the special distribution declared on December 15, 2006. In connection with the special
distribution declared on December 17, 2007, the exchange rate was further adjusted from 9.3900 to 10.0066 shares per $1,000 principal amount of notes effective as of December 31, 2007, resulting in the current exchange price of
approximately $99.93 per share of Boston Properties, Inc.s common stock. On and after May 18, 2013, the notes will be exchangeable at any time prior to the close of business on the scheduled trading day immediately preceding the maturity
date at the option of the holder at the applicable exchange rate. The exchange rate is subject to adjustment in certain circumstances.

Prior to May 18, 2013, we may not redeem the notes except to preserve Boston Properties, Inc.s status as a REIT. On or after May 18, 2013, we may redeem all or a portion of the notes for cash at a redemption price equal to
100% of the principal amount plus accrued and unpaid interest. We must make at least 12 semi-annual interest



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payments (including interest payments on November 15, 2006 and May 15, 2013) before redeeming any notes at our option. Note holders may require us
to repurchase all or a portion of the notes on May 18, 2013 and May 15 of 2016, 2021, 2026 and 2031 at a purchase price equal to 100% of the principal amount plus accrued and unpaid interest up to, but excluding, the repurchase date. We
will pay cash for all notes so repurchased.

If we undergo a fundamental change, note holders will have the option to require
us to purchase all or any portion of the notes at a purchase price equal to 100% of the principal amount of the notes to be purchased plus any accrued and unpaid interest to, but excluding, the fundamental change purchase date. We will pay cash for
all notes so purchased. In addition, if a fundamental change occurs prior to May 18, 2013, we will increase the exchange rate for a holder who elects to exchange our notes in connection with such a fundamental change under certain
circumstances.

Mortgage Debt

The following represents the outstanding principal balances due under the mortgages notes payable at December 31, 2008:



|                                   |  |                        |   |  |                     |   |  |                       |           |                      |   |                |  |   |               |         |  |                  
|---------------------------------- |  | ---------------------- | - |  | ------------------- | - |  | --------------------- | --------- | -------------------- | - | -------------- |  | - | ------------- | ------- |  | -----------------
|Properties                         |  | StatedInterestRate     |   |  | GAAPInterestRate(1) |   |  | StatedPrincipalAmount |           | Fair ValueAdjustment |   | CarryingAmount |  |   | Maturity Date
|                                   |  | (Dollars in thousands)
|599 Lexington Avenue               |  | 5.57                   | % |  | 5.41                | % |  | $                     | 750,000   |                      | $ |               |  | $ | 750,000       | (2)(3)  |  | March 1, 2017    
|Citigroup Center                   |  | 7.19                   | % |  | 7.24                | % |  |                       | 475,008   |                      |   | 1,480          |  |   | 476,488       | (4)     |  | May 11, 2011     
|Embarcadero Center Four            |  | 6.10                   | % |  | 7.02                | % |  |                       | 375,000   |                      |   |               |  |   | 375,000       | (5)     |  | December 1, 2016 
|South of Market                    |  | 2.70                   | % |  | 2.93                | % |  |                       | 183,125   |                      |   |               |  |   | 183,125       | (3)(6)  |  | November 21, 2009
|505 9thStreet                      |  | 5.73                   | % |  | 5.87                | % |  |                       | 130,000   |                      |   |               |  |   | 130,000       |         |  | November 1, 2017 
|Wisconsin Place Office             |  | 3.39                   | % |  | 3.63                | % |  |                       | 71,693    |                      |   |               |  |   | 71,693        | (3)(7)  |  | January 29, 2011 
|One Freedom Square                 |  | 7.75                   | % |  | 5.34                | % |  |                       | 69,742    |                      |   | 3,899          |  |   | 73,641        | (4)     |  | June 30, 2012    
|New Dominion Tech Park, Bldg. Two  |  | 5.55                   | % |  | 5.58                | % |  |                       | 63,000    |                      |   |               |  |   | 63,000        | (3)     |  | October 1, 2014  
|202, 206 & 214 Carnegie Center     |  | 8.13                   | % |  | 8.22                | % |  |                       | 57,300    |                      |   |               |  |   | 57,300        |         |  | October 1, 2010  
|New Dominion Tech. Park, Bldg. One |  | 7.69                   | % |  | 7.84                | % |  |                       | 52,561    |                      |   |               |  |   | 52,561        | (3)     |  | January 15, 2021 
|140 Kendrick Street                |  | 7.51                   | % |  | 5.25                | % |  |                       | 51,992    |                      |   | 3,494          |  |   | 55,486        | (4)     |  | July 1, 2013     
|Reservoir Place                    |  | 7.00                   | % |  | 5.84                | % |  |                       | 48,411    |                      |   | 278            |  |   | 48,689        | (8)     |  | July 1, 2009     
|1330 Connecticut Avenue            |  | 7.58                   | % |  | 4.74                | % |  |                       | 47,473    |                      |   | 2,825          |  |   | 50,298        | (8)     |  | February 26, 2011
|Kingstowne Two and Retail          |  | 5.99                   | % |  | 5.61                | % |  |                       | 40,767    |                      |   | 933            |  |   | 41,700        | (8)     |  | January 1, 2016  
|10 and 20 Burlington Mall Road     |  | 7.25                   | % |  | 7.31                | % |  |                       | 34,589    |                      |   |               |  |   | 34,589        | (9)     |  | October 1, 2011  
|Democracy Tower                    |  | 3.14                   | % |  | 3.33                | % |  |                       | 30,674    |                      |   |               |  |   | 30,674        | (3)(10) |  | December 19, 2010
|Ten Cambridge Center               |  | 8.27                   | % |  | 8.35                | % |  |                       | 30,593    |                      |   |               |  |   | 30,593        |         |  | May 1, 2010      
|Sumner Square                      |  | 7.35                   | % |  | 7.54                | % |  |                       | 26,242    |                      |   |               |  |   | 26,242        |         |  | September 1, 2013
|Montvale Center                    |  | 5.93                   | % |  | 6.07                | % |  |                       | 25,000    |                      |   |               |  |   | 25,000        | (3)     |  | June 6, 2012     
|Eight Cambridge Center             |  | 7.73                   | % |  | 7.74                | % |  |                       | 23,729    |                      |   |               |  |   | 23,729        |         |  | July 15, 2010    
|1301 New York Avenue               |  | 7.14                   | % |  | 7.24                | % |  |                       | 21,627    |                      |   |               |  |   | 21,627        | (11)    |  | August 15, 2009  
|Kingstowne One                     |  | 5.96                   | % |  | 5.68                | % |  |                       | 19,468    |                      |   | 325            |  |   | 19,793        | (8)     |  | May 5, 2013      
|University Place                   |  | 6.94                   | % |  | 6.99                | % |  |                       | 19,414    |                      |   |               |  |   | 19,414        |         |  | August 1, 2021   
|                                   |  |                        |   |  |                     |   |  |                       |           |                      |   |                |  |   |               |         |  |                  
|Total                              |  |                        |   |  |                     |   |  | $                     | 2,647,408 |                      | $ | 13,234         |  | $ | 2,660,642     |         |  |                  
|                                   |  |                        |   |  |                     |   |  |                       |           |                      |   |                |  |   |               |         |  |                  



|(1) | GAAP interest rate differs from the stated interest rate due to the inclusion of the amortization of financing charges, effects of hedging transactions and adjustments required by
EITF 98-1. All adjustments related to EITF 98-1 are noted above.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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|(2) | On December 19, 2006, we terminated the forward-starting interest rate swap contracts related to this financing and received approximately $10.9 million, which amount will
reduce our interest expense for this mortgage over the term of the financing, resulting in an effective interest rate of 5.41% per annum for the financing. The stated interest rate is 5.57% per annum. The mortgage loan requires interest
only payments with a balloon payment due at maturity.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | The mortgage loan requires interest only payments with a balloon payment due at maturity.
|--- | -----------------------------------------------------------------------------------------

|(4) | In accordance with EITF 98-1, the principal amount and interest rate shown were adjusted upon redemption of the outside members equity interest in the limited liability
company that owns the property to reflect the fair value of the note.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(5) | On November 13, 2008, we closed on an eight-year, $375.0 million mortgage loan collateralized by Four Embarcadero Center located in San Francisco, California. The mortgage loan
bears interest at a fixed rate of 6.10% per annum. Under our interest rate hedging program, we will reclassify into earnings over the eight-year term of the loan as an increase in interest expense approximately $26.4 million (approximately $3.3
million per year) of the amounts recorded on our Consolidated Balance Sheet within Accumulated Other Comprehensive Loss resulting in an effective interest rate of 7.02% per annum.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(6) | The construction financing bears interest at a variable rate equal to LIBOR plus 1.00% per annum and matures on November 21, 2009 with two, one year extension options. In
addition, we entered into an interest rate swap contract to fix the one-month LIBOR index rate at 4.57% per annum on a notional amount of $96.7 million. The swap contract went into effect on October 22, 2007 and expired on October 29,
2008.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(7) | The construction financing bears interest at a variable rate equal to LIBOR plus 1.25% per annum and matures on January 29, 2011 with two, one-year extension options.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(8) | In accordance with EITF 98-1, the principal amount and interest rate shown were adjusted upon acquisition of the property to reflect the fair value of the assumed note.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(9) | Includes outstanding indebtedness secured by 91 Hartwell Avenue.
|--- | ----------------------------------------------------------------

|(10) | The construction financing bears interest at a variable rate equal to LIBOR plus 1.75% per annum and matures on December 19, 2010 with two one-year extension options.
|---- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(11) | Includes outstanding principal in the amounts of $17.7 million, $2.8 million and $1.1 million which bear interest at fixed rates of 6.70%, 8.54% and 6.75% per annum,
respectively.
|---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Contractual aggregate principal payments of mortgage notes payable at December 31, 2008 are as follows:



|           |  |                    |          
|---------- |  | ------------------ | ---------
|Year       |  | Principal Payments
|           |  | (in thousands)    
|2009       |  | $                  | 274,659  
|2010       |  |                    | 161,489  
|2011       |  |                    | 620,808  
|2012       |  |                    | 105,059  
|2013       |  |                    | 100,436  
|Thereafter |  |                    | 1,384,957

Market Risk

Market risk is the risk of loss from adverse changes in market prices and interest rates. Our future earnings, cash flows and fair values relevant to financial instruments are dependent upon prevalent market interest
rates. Our primary market risk results from our indebtedness, which bears interest at fixed and variable rates. The fair value of our debt obligations are affected by changes in the market interest rates. We manage our market risk by matching
long-term leases with long-term, fixed-rate, non-recourse debt of similar duration. We continue to follow a conservative strategy of generally pre-leasing development projects on a long-term basis to creditworthy tenants in order to achieve the most
favorable construction and permanent financing terms. Approximately 94% of our outstanding debt has fixed interest rates, which minimizes the interest rate risk through the maturity of such outstanding debt. We also manage our market risk by
entering into hedging arrangements with financial institutions. Our primary objectives when undertaking hedging transactions and derivative positions is to reduce our floating rate exposure and to fix a portion of the interest rate for anticipated
financing and refinancing transactions. This in turn, reduces the risks that the variability of cash flows imposes on variable rate debt. Our strategy mitigates us against future increases in interest rates.



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During 2007, we commenced an interest rate hedging program for our expected financing activity in 2008
and entered into 11 treasury locks based on a weighted-average 10-year treasury rate of 4.68% per annum on notional amounts aggregating $375.0 million. Nine of the treasury locks with notional amounts aggregating $325.0 million matured on
April 1, 2008, at which time we cash-settled the contracts and made cash payments to the counterparties totaling approximately $33.5 million. The remaining two treasury locks with notional amounts aggregating $50.0 million matured on
July 31, 2008, at which time we cash-settled the contracts and made cash payments to the counterparties totaling approximately $1.3 million. In addition, we entered into five forward-starting interest rate swap contracts to lock the 10-year
LIBOR swap rate on notional amounts aggregating $150.0 million at a weighted-average forward-starting 10-year swap rate of 5.19% per annum. The 10-year treasury rate is a component of the 10-year swap rate and the swap contracts effectively
fixed the 10-year treasury rate at a weighted-average interest rate of 4.51% per annum. The swap contracts went into effect on July 31, 2008 and were to expire on July 31, 2018. On July 31, 2008 and September 2, 2008, we
cash-settled our forward-starting interest rate swap contracts and made aggregate cash payments to the counterparties totaling approximately $8.6 million. Collectively, all of the foregoing contracts were intended to have effectively fixed the
10-year treasury rate at a weighted-average interest rate of 4.63% per annum on notional amounts aggregating $525.0 million. We entered into the treasury locks and interest rate swap contracts designated and qualifying as cash flow hedges to
reduce our exposure to the variability in future cash flows attributable to changes in the hedged rate in contemplation of obtaining ten-year fixed-rate financings in 2008.

SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities (SFAS No. 133), as amended and interpreted,
establishes accounting and reporting standards for derivative instruments. We have formally documented all of our relationships between hedging instruments and hedged items, as well as our risk-management objective and strategy for undertaking
various hedge transactions. We also assess and document, both at the hedging instruments inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are highly effective in offsetting changes in cash flows
associated with the hedged items. All components of the treasury locks and forward-starting interest rate swap contracts were included in the assessment of hedge effectiveness. During the year ended December 31, 2008, we modified the estimated
dates with respect to our anticipated financings under the interest rate hedging program. As a result, in the aggregate during the first three quarters of 2008 we recognized a net derivative loss of approximately $3.3 million representing the
partial ineffectiveness of the interest rate contracts. In addition, on September 9, 2008, we executed an interest rate lock agreement with lenders at an all-in fixed rate, inclusive of the credit spread, of 6.10% per annum for an
eight-year, $375.0 million loan collateralized by our Four Embarcadero Center property located in San Francisco, California. Our interest rate hedging program contemplated a financing with a ten-year term and, as a result, under SFAS No. 133,
during the third quarter of 2008 we recognized a net derivative loss of approximately $6.6 million representing the partial ineffectiveness of our interest rate contracts. We will reclassify into earnings over the eight-year term of the Four
Embarcadero Center loan as an increase in interest expense approximately $26.4 million (approximately $3.3 million per year) of the amounts recorded on our Consolidated Balance Sheet within Accumulated Other Comprehensive Loss, which amounts
represent the effective portion of the applicable interest rate hedging contracts. Our interest rate hedging program also contemplated obtaining additional financing of at least $150.0 million by the end of 2008. In accordance with SFAS
No. 133, Accounting for Derivative Instruments and Hedging Activities, as amended and interpreted, we determined that we would be unable to complete the financing by the required date under its hedging program. As a result, during
the fourth quarter of 2008, we recognized a net derivative loss of approximately $7.2 million representing the ineffectiveness of our remaining interest rate hedging contracts.

On September 27, 2007, we entered into an interest rate swap contract to fix the one-month LIBOR index rate (including a 1.25% spread), at
5.82% per annum on a notional amount of $96.7 million. The swap contract went into effect on October 22, 2007 and expired on October 29, 2008.

At December 31, 2008, our outstanding variable rate debt based on LIBOR totaled approximately $385.5 million. At December 31, 2008, the interest rate on our variable rate debt was approximately 3.62%. If
market interest rates on our variable rate debt had been 100 basis points greater, total interest expense would have increased approximately $3.9 million for the year ended December 31, 2008.



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These amounts were determined solely by considering the impact of hypothetical interest rates on our
financial instruments. Due to the uncertainty of specific actions we may undertake to minimize possible effects of market interest rate increases, this analysis assumes no changes in our financial structure.

Funds from Operations

Pursuant to the revised
definition of Funds from Operations adopted by the Board of Governors of the National Association of Real Estate Investment Trusts (NAREIT), we calculate Funds from Operations, or FFO, by adjusting net income (loss) available
to common unitholders (computed in accordance with GAAP, including non-recurring items) for gains (or losses) from sales of properties, real estate related depreciation and amortization, and after adjustment for unconsolidated partnerships, joint
ventures and preferred distributions. FFO is a non-GAAP financial measure. The use of FFO, combined with the required primary GAAP presentations, has been fundamentally beneficial in improving the understanding of operating results of REITs among
the investing public and making comparisons of REIT operating results more meaningful. Management generally considers FFO to be a useful measure for reviewing our comparative operating and financial performance because, by excluding gains and losses
related to sales of previously depreciated operating real estate assets and excluding real estate asset depreciation and amortization (which can vary among owners of identical assets in similar condition based on historical cost accounting and
useful life estimates), FFO can help one compare the operating performance of a companys real estate between periods or as compared to different companies. Our computation of FFO may not be comparable to FFO reported by other REITs or real
estate companies that do not define the term in accordance with the current NAREIT definition or that interpret the current NAREIT definition differently.

In addition to presenting FFO in accordance with the NAREIT definition, we also disclose FFO, as adjusted, which excludes the effects of the losses from early extinguishments of debt associated with the sales of real
estate. Losses from early extinguishments of debt result when the sale of real estate encumbered by debt requires us to pay the extinguishment costs prior to the debts stated maturity and to write-off unamortized loan costs at the date of the
extinguishment. Such costs are excluded from the gains on sales of real estate reported in accordance with GAAP. However, we view the losses from early extinguishments of debt associated with the sales of real estate as an incremental cost
of the sale transactions because we extinguished the debt in connection with the consummation of the sale transactions and we had no intent to extinguish the debt absent such transactions. We believe that adjusting FFO to exclude these losses
more appropriately reflects the results of our operations exclusive of the impact of our sale transactions.

Although our FFO, as adjusted,
clearly differs from NAREITs definition of FFO, and may not be comparable to that of other REITs and real estate companies, we believe it provides a meaningful supplemental measure of our operating performance because we believe that by
excluding the effects of the losses from early extinguishments of debt associated with the sales of real estate, management and investors are presented with an indicator of our operating performance that more closely achieves the objectives of the
real estate industry in presenting FFO.

Neither FFO, nor FFO as adjusted, should be considered as an alternative to net income (determined
in accordance with GAAP) as an indication of our performance. Neither FFO nor FFO, as adjusted, represent cash generated from operating activities determined in accordance with GAAP and neither of these measures is a measure of liquidity or an
indicator of our ability to make cash distributions. We believe that to further understand our performance, FFO and FFO, as adjusted, should be compared with our reported net income and considered in addition to cash flows in accordance with GAAP,
as presented in our Consolidated Financial Statements.



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The following table presents a reconciliation of net income available to common unitholders to FFO and
FFO, as adjusted, for the years ended December 31, 2008, 2007, 2006, 2005 and 2004:



|                                                                                                                                                                                                                                                                                                                    |  |                         |          |   |      |   |           |      |  |      |           |      |   |         |  |   |        
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ----------------------- | -------- | - | ---- | - | --------- | ---- |  | ---- | --------- | ---- | - | ------- |  | - | -------
|                                                                                                                                                                                                                                                                                                                    |  | Year ended December 31,
|                                                                                                                                                                                                                                                                                                                    |  | 2008                    |          |   | 2007 |   |           | 2006 |  | 2005 |           | 2004
|                                                                                                                                                                                                                                                                                                                    |  | (in thousands)         
|Net income available to common unitholders                                                                                                                                                                                                                                                                          |  | $                       | 155,875  |   |      | $ | 1,598,076 |      |  | $    | 1,048,685 |      | $ | 534,788 |  | $ | 344,800
|                                                                                                                                                                                                                                                                                                                    |  |                         |          |   |     
|Add:                                                                                                                                                                                                                                                                                                                |  |                         |          |   |      |   |           |      |  |      |           |      |   |         |  |   |        
|Preferred distributions and allocation of undistributed earnings                                                                                                                                                                                                                                                    |  |                         | 4,226    |   |      |   | 15,014    |      |  |      | 22,814    |      |   | 26,780  |  |   | 17,133 
|Cumulative effect of a change in accounting principle                                                                                                                                                                                                                                                               |  |                         |         |   |      |   |          |      |  |      |          |      |   | 5,043   |  |   |       
|Less:                                                                                                                                                                                                                                                                                                               |  |                         |          |   |      |   |           |      |  |      |           |      |   |         |  |   |        
|Gains on sales of real estate from discontinued operations                                                                                                                                                                                                                                                          |  |                         |         |   |      |   | 266,817   |      |  |      |          |      |   | 57,969  |  |   | 33,427 
|Income from discontinued operations,                                                                                                                                                                                                                                                                                |  |                         |         |   |      |   | 7,274     |      |  |      | 19,081    |      |   | 18,303  |  |   | 19,635 
|Gains on sales of real estate and other assets                                                                                                                                                                                                                                                                      |  |                         | 33,340   |   |      |   | 957,406   |      |  |      | 727,131   |      |   | 188,546 |  |   | 9,822  
|Income (loss) from unconsolidated joint ventures                                                                                                                                                                                                                                                                    |  |                         | (182,018 | ) |      |   | 20,428    |      |  |      | 24,507    |      |   | 4,829   |  |   | 3,380  
|Minority interests in property partnerships                                                                                                                                                                                                                                                                         |  |                         | (1,997   | ) |      |   | (84       | )    |  |      | 2,013     |      |   | 6,017   |  |   | 4,685  
|                                                                                                                                                                                                                                                                                                                    |  |                         |          |   |      |   |           |      |  |      |           |      |   |         |  |   |        
|Income before minority interests in property partnerships, income (loss) from unconsolidated joint ventures, gains on sales of real estate and
other assets, discontinued operations and cumulative effect of a change in accounting principle and preferred distributions and allocation of undistributed earnings |  |                         | 310,776  |   |      |   | 361,249   |      |  |      | 298,767   |      |   | 290,947 |  |   | 290,984
|Add:                                                                                                                                                                                                                                                                                                                |  |                         |          |   |      |   |           |      |  |      |           |      |   |         |  |   |        
|Real estate depreciation and amortization (1)                                                                                                                                                                                                                                                                       |  |                         | 374,575  |   |      |   | 287,854   |      |  |      | 279,199   |      |   | 271,829 |  |   | 255,594
|Income from discontinued operations                                                                                                                                                                                                                                                                                 |  |                         |         |   |      |   | 7,274     |      |  |      | 19,081    |      |   | 18,303  |  |   | 19,843 
|Income (loss) from unconsolidated jointventures (2)                                                                                                                                                                                                                                                                 |  |                         | (182,018 | ) |      |   | 4,975     |      |  |      | 6,590     |      |   | 4,829   |  |   | 3,380  
|Less:                                                                                                                                                                                                                                                                                                               |  |                         |          |   |      |   |           |      |  |      |           |      |   |         |  |   |        
|Minority interests in property partnerships share of funds from operations                                                                                                                                                                                                                                         |  |                         | 3,949    |   |      |   | 437       |      |  |      | 479       |      |   | 113     |  |   | 922    
|Preferred distributions (3)                                                                                                                                                                                                                                                                                         |  |                         | 3,738    |   |      |   | 4,266     |      |  |      | 9,418     |      |   | 12,918  |  |   | 15,050 
|                                                                                                                                                                                                                                                                                                                    |  |                         |          |   |      |   |           |      |  |      |           |      |   |         |  |   |        
|Funds from operations                                                                                                                                                                                                                                                                                               |  |                         | 495,646  |   |      |   | 656,649   |      |  |      | 593,740   |      |   | 572,877 |  |   | 553,829
|                                                                                                                                                                                                                                                                                                                    |  |                         |          |   |     
|Add:                                                                                                                                                                                                                                                                                                                |  |                         |          |   |      |   |           |      |  |      |           |      |   |         |  |   |        
|Losses from early extinguishments of debt associated with the sales of real estate                                                                                                                                                                                                                                  |  |                         |         |   |      |   | 2,675     |      |  |      | 31,444    |      |   | 11,041  |  |   |       
|                                                                                                                                                                                                                                                                                                                    |  |                         |          |   |      |   |           |      |  |      |           |      |   |         |  |   |        
|Funds from operations available to common unitholders after supplemental adjustment to exclude losses from early extinguishments of debt
associated with the sales of real estate                                                                                                                                   |  | $                       | 495,646  |   |      | $ | 659,324   |      |  | $    | 625,184   |      | $ | 583,918 |  | $ | 553,829
|                                                                                                                                                                                                                                                                                                                    |  |                         |          |   |      |   |           |      |  |      |           |      |   |         |  |   |        
|Weighted average units outstandingbasic                                                                                                                                                                                                                                                                            |  |                         | 140,336  |   |      |   | 139,290   |      |  |      | 135,923   |      |   | 132,881 |  |   | 128,313
|                                                                                                                                                                                                                                                                                                                    |  |                         |          |   |      |   |           |      |  |      |           |      |   |         |  |   |        



|(1) | Real estate depreciation and amortization consists of depreciation and amortization from the Consolidated Statements of Operations of $296,122, $278,249, $266,411, $258,332 and
$242,864, our share of unconsolidated joint venture real estate depreciation and amortization of $80,303, $8,247, $9,087, $8,554 and $6,814, and depreciation and amortization from discontinued operations of $0, $2,948, $6,197, $6,662 and $8,352,
less corporate related depreciation and amortization of $1,850, $1,590, $1,584, $1,719 and $2,436 and adjustment of asset retirement obligations of $0, $0, $912, $0 and $0 for the years ended December 31, 2008, 2007, 2006, 2005 and 2004,
respectively.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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|(2) | Includes non-cash impairment losses aggregating approximately $168.0 million for the year ended December 31, 2008 in accordance with APB No. 18 The Equity Method of
Accounting for Investments in Common Stock. Excludes approximately $15.5 million related to our share of the gain on sale and related loss from early extinguishment of debt associated with the sale of Worldgate Plaza for the year ended
December 31, 2007. Excludes approximately $17.9 million related to our share of the gain on sale and related loss from early extinguishment of debt associated with the sale of 265 Franklin Street for the year ended December 31, 2006.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | Excludes approximately $5.6 million, $12.2 million and $12.1 million for the years ended December 31, 2007, 2006 and 2005, respectively, of income allocated to the holders of
Series Two Preferred Units to account for their right to participate on an as-converted basis in the special distributions that followed previously completed sales of real estate.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Reconciliation to Diluted Funds from Operations:



|                                                                                                                                                          |  |                                  |         |                           |         |                   |   |                           |  |                   |  |                           |         |                   |         |                           |   |                   |  |                           |  |   |         |  |        
|--------------------------------------------------------------------------------------------------------------------------------------------------------- |  | -------------------------------- | ------- | ------------------------- | ------- | ----------------- | - | ------------------------- |  | ----------------- |  | ------------------------- | ------- | ----------------- | ------- | ------------------------- | - | ----------------- |  | ------------------------- |  | - | ------- |  | -------
|                                                                                                                                                          |  | For the years ended December 31,
|                                                                                                                                                          |  | 2008                             |         | 2007                      |         | 2006              |   | 2005                      |  | 2004             
|                                                                                                                                                          |  | Income(Numerator)                |         | Shares/Units(Denominator) |         | Income(Numerator) |   | Shares/Units(Denominator) |  | Income(Numerator) |  | Shares/Units(Denominator) |         | Income(Numerator) |         | Shares/Units(Denominator) |   | Income(Numerator) |  | Shares/Units(Denominator)
|Basic funds from operations after supplemental adjustment to exclude losses from early extinguishments of debt associated with the sales of
real estate   |  | $                                | 495,646 |                           | 140,336 |                   | $ | 659,324                   |  | 139,290           |  | $                         | 625,184 |                   | 135,923 |                           | $ | 583,918           |  | 132,881                   |  | $ | 553,829 |  | 128,313
|Effect of Dilutive Securities:                                                                                                                            |  |                                  |         |                           |         |                   |   |                           |  |                   |  |                           |         |                   |         |                           |   |                   |  |                           |  |   |         |  |        
|Convertible Preferred Units (1)                                                                                                                           |  |                                  | 3,738   |                           | 1,461   |                   |   | 4,266                     |  | 1,674             |  |                           | 9,418   |                   | 3,629   |                           |   | 12,918            |  | 5,163                     |  |   | 15,050  |  | 6,054  
|Stock Options and other (2)                                                                                                                               |  |                                  |        |                           | 1,319   |                   |   |                          |  | 1,941             |  |                           |        |                   | 2,356   |                           |   |                  |  | 2,285                     |  |   |        |  | 2,303  
|                                                                                                                                                          |  |                                  |         |                           |         |                   |   |                           |  |                   |  |                           |         |                   |         |                           |   |                   |  |                           |  |   |         |  |        
|Diluted funds from operations after supplemental adjustment to exclude losses from early extinguishments of debt associated with the sales of
real estate |  | $                                | 499,384 |                           | 143,116 |                   | $ | 663,590                   |  | 142,905           |  | $                         | 634,602 |                   | 141,908 |                           | $ | 596,836           |  | 140,329                   |  | $ | 568,879 |  | 136,670
|                                                                                                                                                          |  |                                  |         |                           |         |                   |   |                           |  |                   |  |                           |         |                   |         |                           |   |                   |  |                           |  |   |         |  |        



|(1) | Excludes approximately $5.6 million, $12.2 million and $12.1 million for the years ended December 31, 2007, 2006 and 2005, respectively, of income allocated to the holders of
Series Two Preferred Units to account for their right to participate on an as-converted basis in the special distributions that followed previously completed sales of real estate.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(2) | Stock options are related to Boston Properties, Inc.
|--- | ----------------------------------------------------



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Net Operating Income

Net operating income, or NOI, is a non-GAAP financial measure equal to net income available to common unitholders, the most directly comparable GAAP financial measure, plus net derivative losses, losses
from investment in securities, losses from early extinguishments of debt, cumulative effect of a change in accounting principle, preferred distributions and allocation of undistributed earnings, depreciation and amortization, interest expense and
general and administrative expense, less gains on sales of real estate from discontinued operations, income from discontinued operations, gains on sales of real estate and other assets, income (loss) from unconsolidated joint ventures, minority
interests in property partnerships, interest and other income and development and management services revenue. We use NOI internally as a performance measure and believe NOI provides useful information to investors regarding our financial condition
and results of operations because it reflects only those income and expense items that are incurred at the property level. Therefore, we believe NOI is a useful measure for evaluating the operating performance of our real estate assets.

Our management also uses NOI to evaluate regional property level performance and to make decisions about resource allocations. Further, we believe NOI
is useful to investors as a performance measure because, when compared across periods, NOI reflects the impact on operations from trends in occupancy rates, rental rates, operating costs and acquisition and development activity on an unleveraged
basis, providing perspective not immediately apparent from net income. NOI excludes certain components from net income in order to provide results that are more closely related to a propertys results of operations. For example, interest
expense is not necessarily linked to the operating performance of a real estate asset and is often incurred at the corporate level as opposed to the property level. In addition, depreciation and amortization, because of historical cost accounting
and useful life estimates, may distort operating performance at the property level. NOI presented by us may not be comparable to NOI reported by other REITs and real estate companies that define NOI differently. We believe that in order to
facilitate a clear understanding of our operating results, NOI should be examined in conjunction with net income as presented in our Consolidated Financial Statements. NOI should not be considered as an alternative to net income as an indication of
our performance or to cash flows as a measure of liquidity or ability to make distributions.

The following sets forth a reconciliation of
NOI to net income available to common unitholders for the fiscal years 2004 through 2008.



|                                                                 |  |                          |          |   |      |   |           |      |  |      |           |      |   |         |  |   |        
|---------------------------------------------------------------- |  | ------------------------ | -------- | - | ---- | - | --------- | ---- |  | ---- | --------- | ---- | - | ------- |  | - | -------
|                                                                 |  | Years ended December 31,
|                                                                 |  | 2008                     |          |   | 2007 |   |           | 2006 |  | 2005 |           | 2004
|Net operating income                                             |  | $                        | 923,384  |   |      | $ | 888,425   |      |  | $    | 898,459   |      | $ | 896,449 |  | $ | 869,138
|Add:                                                             |  |                          |          |   |      |   |           |      |  |      |           |      |   |         |  |   |        
|Development and management services                              |  |                          | 30,518   |   |      |   | 20,553    |      |  |      | 19,820    |      |   | 17,310  |  |   | 20,440 
|Interest and other                                               |  |                          | 18,958   |   |      |   | 89,706    |      |  |      | 36,677    |      |   | 11,978  |  |   | 10,334 
|Minority interests in property partnerships                      |  |                          | (1,997   | ) |      |   | (84       | )    |  |      | 2,013     |      |   | 6,017   |  |   | 4,685  
|Income (loss) from unconsolidated joint ventures                 |  |                          | (182,018 | ) |      |   | 20,428    |      |  |      | 24,507    |      |   | 4,829   |  |   | 3,380  
|Gains on sales of real estate and other assets                   |  |                          | 33,340   |   |      |   | 957,406   |      |  |      | 727,131   |      |   | 188,546 |  |   | 9,822  
|Income from discontinued operations                              |  |                          |         |   |      |   | 7,274     |      |  |      | 19,081    |      |   | 18,303  |  |   | 19,635 
|Gains on sales of real estate from discontinued operations       |  |                          |         |   |      |   | 266,817   |      |  |      |          |      |   | 57,969  |  |   | 33,427 
|Less:                                                            |  |                          |          |   |      |   |           |      |  |      |           |      |   |         |  |   |        
|General and administrative                                       |  |                          | 72,365   |   |      |   | 69,882    |      |  |      | 59,375    |      |   | 55,471  |  |   | 53,636 
|Interest expense                                                 |  |                          | 271,972  |   |      |   | 285,887   |      |  |      | 298,260   |      |   | 308,091 |  |   | 306,170
|Depreciation and amortization                                    |  |                          | 296,122  |   |      |   | 278,249   |      |  |      | 266,411   |      |   | 258,332 |  |   | 242,864
|Net derivative losses                                            |  |                          | 17,021   |   |      |   |          |      |  |      |          |      |   |        |  |   |       
|Losses from investments in securities                            |  |                          | 4,604    |   |      |   |          |      |  |      |          |      |   |        |  |   |       
|Losses from early extinguishments of debt                        |  |                          |         |   |      |   | 3,417     |      |  |      | 32,143    |      |   | 12,896  |  |   | 6,258  
|Cumulative effect of a change in accounting principle            |  |                          |         |   |      |   |          |      |  |      |          |      |   | 5,043   |  |   |       
|Preferred distributions and allocation of undistributed earnings |  |                          | 4,226    |   |      |   | 15,014    |      |  |      | 22,814    |      |   | 26,780  |  |   | 17,133 
|                                                                 |  |                          |          |   |      |   |           |      |  |      |           |      |   |         |  |   |        
|Net income available to common unitholders                       |  | $                        | 155,875  |   |      | $ | 1,598,076 |      |  | $    | 1,048,685 |      | $ | 534,788 |  | $ | 344,800
|                                                                 |  |                          |          |   |      |   |           |      |  |      |           |      |   |         |  |   |        



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Contractual Obligations

As of December 31, 2008, we were subject to contractual payment obligations as described in the table below.



|                                               |  |                        |           |      |   |           |  |      |         |      |   |           |  |            |           |  |   |           |  |   |          
|---------------------------------------------- |  | ---------------------- | --------- | ---- | - | --------- |  | ---- | ------- | ---- | - | --------- |  | ---------- | --------- |  | - | --------- |  | - | ---------
|                                               |  | Payments Due by Period
|                                               |  | Total                  |           | 2009 |   | 2010      |  | 2011 |         | 2012 |   | 2013      |  | Thereafter
|                                               |  | (Dollars in thousands)
|Contractual Obligations:                       |  |                        |           |      |   |           |  |      |         |      |   |           |  |            |           |  |   |           |  |   |          
|Long-term debt                                 |  |                        |           |      |   |           |  |      |         |      |   |           |  |            |           |  |   |           |  |   |          
|Mortgage debt (1)                              |  | $                      | 3,516,504 |      | $ | 429,263   |  | $    | 304,022 |      | $ | 732,326   |  | $          | 195,845   |  | $ | 184,449   |  | $ | 1,670,599
|Unsecured seniornotes (1)                      |  |                        | 1,926,096 |      |   | 87,188    |  |      | 87,188  |      |   | 87,188    |  |            | 87,188    |  |   | 983,281   |  |   | 594,063  
|Exchangeable senior notes (1)                  |  |                        | 2,356,729 |      |   | 68,769    |  |      | 68,769  |      |   | 68,769    |  |            | 912,671   |  |   | 483,477   |  |   | 754,274  
|Unsecured line of credit (1)                   |  |                        | 105,635   |      |   |          |  |      | 105,635 |      |   |          |  |            |          |  |   |          |  |   |         
|Ground leases                                  |  |                        | 140,543   |      |   | 9,174     |  |      | 11,471  |      |   | 11,496    |  |            | 11,522    |  |   | 11,548    |  |   | 85,332   
|Tenant obligations (2)                         |  |                        | 98,417    |      |   | 78,963    |  |      | 16,752  |      |   | 2,422     |  |            |          |  |   | 280       |  |   |         
|Construction contracts on development projects |  |                        | 754,795   |      |   | 393,178   |  |      | 247,634 |      |   | 97,122    |  |            | 16,861    |  |   |          |  |   |         
|Other Obligations (3)                          |  |                        | 27,180    |      |   | 25,116    |  |      | 116     |      |   | 977       |  |            | 116       |  |   | 116       |  |   | 739      
|                                               |  |                        |           |      |   |           |  |      |         |      |   |           |  |            |           |  |   |           |  |   |          
|Total Contractual Obligations                  |  | $                      | 8,925,899 |      | $ | 1,091,651 |  | $    | 841,587 |      | $ | 1,000,300 |  | $          | 1,224,203 |  | $ | 1,663,151 |  | $ | 3,105,007
|                                               |  |                        |           |      |   |           |  |      |         |      |   |           |  |            |           |  |   |           |  |   |          



|(1) | Amounts include principal and interest payments.
|--- | ------------------------------------------------

|(2) | Committed tenant-related obligations based on executed leases as of December 31, 2008 (tenant improvements and lease commissions).
|--- | ----------------------------------------------------------------------------------------------------------------------------------

|(3) | Primarily represents the remaining obligation related to our redemption of partnership interests in Citigroup Center.
|--- | ---------------------------------------------------------------------------------------------------------------------

We have various standing or renewable service contracts with vendors related to our property management. In addition, we have certain other utility
contracts we enter into in the ordinary course of business that may extend beyond one year and that vary based on usage. These contracts are not included as part of our contractual obligations because they include terms that provide for cancellation
with insignificant or no cancellation penalties. Contract terms are generally one year or less.



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Off-Balance Sheet Arrangements

Joint Ventures

We have investments in twelve unconsolidated joint ventures (including our
investment in the Value-Added Fund) with our effective ownership interests ranging from 23.89% to 60%, all of which have mortgage indebtedness. We exercise significant influence over, but do not control, these entities and therefore they are
presently accounted for using the equity method of accounting. See also Note 5 to the Consolidated Financial Statements. At December 31, 2008, the debt related to these ventures was equal to approximately $3.2 billion. The table below
summarizes the outstanding debt of these joint venture properties at December 31, 2008:



|                              |  |                        |   |  |                    |   |  |                     |   |  |                       |           |                      |   |          |                 |  |   |               |        |  |                   
|----------------------------- |  | ---------------------- | - |  | ------------------ | - |  | ------------------- | - |  | --------------------- | --------- | -------------------- | - | -------- | --------------- |  | - | ------------- | ------ |  | ------------------
|Properties                    |  | VentureOwnership%      |   |  | StatedInterestRate |   |  | GAAPInterestRate(1) |   |  | StatedPrincipalAmount |           | Fair ValueAdjustment |   |          | Carrying Amount |  |   | Maturity Date
|                              |  | (Dollars in thousands)
|General Motors Building:      |  |                        |   |  |                    |   |  |                     |   |  |                       |           |                      |   |          |                 |  |   |               |        |  |                   
|Secured 1stMortgage           |  | 60                     | % |  | 5.95               | % |  | 6.50                | % |  | $                     | 1,300,000 |                      | $ | (53,834  | )               |  | $ | 1,246,166     | (2)    |  | October 7, 2017   
|Mezzanine Loan                |  | 60                     | % |  | 6.02               | % |  | 8.00                | % |  |                       | 306,000   |                      |   | (43,084  | )               |  |   | 262,916       | (2)(3) |  | October 7, 2017   
|Partner Loans                 |  | 60                     | % |  | 11.00              | % |  | 11.00               | % |  |                       | 450,000   |                      |   |         |                 |  |   | 450,000       | (4)    |  | June 9, 2017      
|125 West 55thStreet:          |  |                        |   |  |                    |   |  |                     |   |  |                       |           |                      |   |          |                 |  |   |               |        |  |                   
|Secured 1stMortgage           |  | 60                     | % |  | 5.75               | % |  | 6.07                | % |  |                       | 200,000   |                      |   | (1,696   | )               |  |   | 198,304       | (2)    |  | March 1, 2010     
|Mezzanine Loan                |  | 60                     | % |  | 7.81               | % |  | 10.82               | % |  |                       | 63,500    |                      |   | (1,037   | )               |  |   | 62,463        | (2)    |  | March 1, 2010     
|Two Grand Central Tower       |  | 60                     | % |  | 5.10               | % |  | 6.20                | % |  |                       | 190,000   |                      |   | (2,933   | )               |  |   | 187,067       | (2)    |  | July 11 , 2010    
|540 Madison Avenue            |  | 60                     | % |  | 5.20               | % |  | 6.75                | % |  |                       | 119,800   |                      |   | (6,813   | )               |  |   | 112,987       | (2)    |  | July 11, 2013     
|Metropolitan Square           |  | 51                     | % |  | 6.23               | % |  | 8.23                | % |  |                       | 126,645   |                      |   |         |                 |  |   | 126,645       |        |  | May 1, 2010       
|Market Square North           |  | 50                     | % |  | 7.70               | % |  | 7.74                | % |  |                       | 85,617    |                      |   |         |                 |  |   | 85,617        |        |  | December 19, 2010 
|Eighth Avenue and 46th Street |  | 50                     | % |  | 4.73               | % |  | 5.23                | % |  |                       | 23,600    |                      |   |         |                 |  |   | 23,600        | (5)    |  | May 8, 2009       
|Annapolis Junction            |  | 50                     | % |  | 2.83               | % |  | 2.97                | % |  |                       | 38,826    |                      |   |         |                 |  |   | 38,826        |        |  | September 12, 2010
|Mountain View Tech. Park      |  | 39.5                   | % |  | 3.97               | % |  | 4.31                | % |  |                       | 24,038    |                      |   |         |                 |  |   | 24,038        | (6)(7) |  | March 31, 2011    
|Mountain View Research Park   |  | 39.5                   | % |  | 3.13               | % |  | 3.37                | % |  |                       | 106,350   |                      |   |         |                 |  |   | 106,350       | (6)(8) |  | May 31, 2011      
|901 New York Avenue           |  | 25                     | % |  | 5.19               | % |  | 5.27                | % |  |                       | 167,784   |                      |   |         |                 |  |   | 167,784       |        |  | January 1, 2015   
|One & Two Circle Star Way     |  | 25                     | % |  | 6.57               | % |  | 6.67                | % |  |                       | 42,000    |                      |   |         |                 |  |   | 42,000        | (6)    |  | September 1, 2013 
|300 Billerica Road            |  | 25                     | % |  | 5.69               | % |  | 6.07                | % |  |                       | 7,500     |                      |   |         |                 |  |   | 7,500         | (6)    |  | January 1, 2016   
|Wisconsin Place Retail        |  | 5                      | % |  | 4.28               | % |  | 4.48                | % |  |                       | 47,286    |                      |   |         |                 |  |   | 47,286        | (9)    |  | March 29, 2010    
|                              |  |                        |   |  |                    |   |  |                     |   |  |                       |           |                      |   |          |                 |  |   |               |        |  |                   
|Total                         |  |                        |   |  |                    |   |  |                     |   |  | $                     | 3,298,946 |                      | $ | (109,397 | )               |  | $ | 3,189,549     |        |  |                   
|                              |  |                        |   |  |                    |   |  |                     |   |  |                       |           |                      |   |          |                 |  |   |               |        |  |                   



|(1) | GAAP interest rate differs from the stated interest rate due to the inclusion of the amortization of financing charges and adjustments required by EITF 98-1. All adjustments related
to EITF 98-1 are noted above.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(2) | In accordance with EITF 98-1, the principal amount and interest rate shown were adjusted upon acquisition of the property to reflect the fair value of the assumed note.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | Principal amount does not include the assumed mezzanine loan with an aggregate principal amount of $294.0 million and a stated rate of 6.02% per annum, as the venture acquired
the lenders interest in this loan for a purchase price of approximately $263.1 million in cash.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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|(4) | In connection with the capitalization of the joint venture, loans in an aggregate of $450.0 million were funded by the ventures partners on a pro-rata basis. Our share of the
partner loans totaling $270.0 million has been reflected in Related Party Note Receivable on our Consolidated Balance Sheets.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(5) | The financing bears interest at a variable rate equal to LIBOR plus 2.25% per annum.
|--- | ------------------------------------------------------------------------------------

|(6) | This property is owned by the Value-Added Fund.
|--- | -----------------------------------------------

|(7) | Mortgage financing totals $26.0 million (of which approximately $24.0 million has been disbursed as of December 31, 2008). The mortgage bears interest at a variable rate of
LIBOR plus 1.50% and matures on March 31, 2011 with two, one-year extension options. The Value-Added Fund has entered into an interest rate swap contract to fix the one-month LIBOR index rate at 4.085% per annum on a notional amount of $24
million. The swap contract went into effect on June 12, 2008 and expires on March 31, 2011.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(8) | Mortgage financing totals $120.0 million (of which $103.0 million was drawn at closing, $3.3 million was drawn to fund tenant and capital costs, with the remaining $13.7 million
available to fund future tenant and capital costs). The mortgage bears interest at a variable rate of LIBOR plus 1.75% and matures on May 31, 2011 with two, one-year extension options. The Value-Added Fund has entered into three interest rate
swap contracts to fix the one-month LIBOR index rate at 3.63% per annum on an aggregate notional amount of $103 million. The swap contracts went into effect on June 2, 2008 and expire on April 1, 2011.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(9) | Amount represents outstanding construction financing under a $66.0 million loan commitment collateralized by the retail entity of Wisconsin Place. Wisconsin Place is a
mixed-use development project consisting of office, retail and residential properties located in Chevy Chase, Maryland. The construction financing bears interest at a variable rate equal to LIBOR plus 1.375% per annum and matures on
March 29, 2010 with two, one-year extension options.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Environmental Matters

It is our policy to retain independent environmental consultants to conduct or update Phase I environmental assessments (which generally do not involve
invasive techniques such as soil or ground water sampling) and asbestos surveys in connection with our acquisition of properties. These pre-purchase environmental assessments have not revealed environmental conditions that we believe will have a
material adverse effect on our business, assets, financial condition, results of operations or liquidity, and we are not otherwise aware of environmental conditions with respect to our properties that we believe would have such a material adverse
effect. However, from time to time environmental conditions at our properties have required and may in the future require environmental testing and/or regulatory filings, as well as remedial action.

In February 1999, we (through a joint venture) acquired from Exxon Corporation a property in Massachusetts that was formerly used as a petroleum bulk
storage and distribution facility and was known by the state regulatory authority to contain soil and groundwater contamination. We developed an office park on the property. We engaged a specially licensed environmental consultant to oversee the
management of contaminated soil and groundwater that was disturbed in the course of construction. Under the property acquisition agreement, Exxon agreed to (1) bear the liability arising from releases or discharges of oil and hazardous
substances which occurred at the site prior to our ownership, (2) continue monitoring and/or remediating such releases and discharges as necessary and appropriate to comply with applicable requirements, and (3) indemnify us for certain
losses arising from preexisting site conditions. Any indemnity claim may be subject to various defenses, and there can be no assurance that the amounts paid under the indemnity, if any, would be sufficient to cover the liabilities arising from any
such releases and discharges.

Environmental investigations at some of our properties and certain properties owned by our affiliates have
identified groundwater contamination migrating from off-site source properties. In each case we engaged a licensed environmental consultant to perform the necessary investigations and assessments, and to prepare any required submittals to the
regulatory authorities. In each case the environmental consultant concluded that the properties qualify under the regulatory program or the regulatory practice for a status which eliminates certain deadlines for conducting response actions at a
site. We also believe that these properties qualify for liability relief under certain statutory provisions or regulatory practices regarding upgradient releases. Although we believe that the current or former owners of the upgradient source
properties may bear responsibility for some or all of the costs of addressing the identified groundwater contamination, we will take such further response actions (if any) that we deem necessary or advisable. Other than periodic testing at some of
these properties, no such additional response actions are anticipated at this time.



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Some of our properties and certain properties owned by our affiliates are located in urban, industrial
and other previously developed areas where fill or current or historical uses of the areas have caused site contamination. Accordingly, it is sometimes necessary to institute special soil and/or groundwater handling procedures and/or include
particular building design features in connection with development, construction and other property operations in order to achieve regulatory closure and/or ensure that contaminated materials are addressed in an appropriate manner. In these
situations it is our practice to investigate the nature and extent of detected contamination and estimate the costs of required response actions and special handling procedures. We then use this information as part of our decision-making process
with respect to the acquisition and/or development of the property. For example, we own a parcel in Massachusetts which was formerly used as a quarry/asphalt batching facility. Pre-purchase testing indicated that the site contained relatively low
levels of certain contaminants. We have engaged a specially licensed environmental consultant to monitor environmental conditions at the site and prepare necessary regulatory submittals based on the results of an environmental risk characterization.
A submittal has been made to the regulatory authorities in order to achieve regulatory closure at this site. The submittal included an environmental deed restriction that mandates compliance with certain protective measures in a portion of the site
where low levels of residual soil contamination have been left in place in accordance with applicable laws. Development activities have commenced on the site and this work will be performed in accordance with the environmental deed restriction and
other environmental requirements applicable to the site.

We expect that resolution of the environmental matters relating to the above will
not have a material impact on our business, assets, financial condition, results of operations or liquidity. However, we cannot assure you that we have identified all environmental liabilities at our properties, that all necessary remediation
actions have been or will be undertaken at our properties or that we will be indemnified, in full or at all, in the event that such environmental liabilities arise.

Newly Issued Accounting Standards

In September 2006, the Financial Accounting Standards Board (the
FASB) issued Statement of Financial Accounting Standards (SFAS) No. 157, Fair Value Measurements (SFAS No. 157). SFAS No. 157 defines fair value and establishes a framework for measuring
fair value, which includes a hierarchy based on the quality of inputs used to measure fair value. SFAS No. 157 also expands disclosures about fair value measurements. SFAS No. 157 does not require any new fair value measurements. SFAS
No. 157 requires the categorization of financial assets and liabilities, based on the inputs to the valuation technique, into a three-level fair value hierarchy. The fair value hierarchy gives the highest priority to the quoted prices in active
markets for identical assets and liabilities and lowest priority to unobservable inputs. SFAS No. 157 requires the use of observable market data, when available, in making fair value measurements. When inputs used to measure fair value fall
within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement. The levels of the SFAS No. 157 fair value hierarchy
are described as follows:



| |  |  | Level 1Financial assets and liabilities whose values are based on unadjusted quoted market prices for identical assets and liabilities in an active market
that the Company has the ability to access.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Level 2Financial assets and liabilities whose values are based on quoted prices in markets that are not active or model inputs that are observable for
substantially the full term of the asset or liability.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Level 3Financial assets and liabilities whose values are based on prices or valuation techniques that require inputs that are both unobservable and
significant to the overall fair value measurement.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

SFAS No. 157 became effective for fiscal years beginning after
November 15, 2007. In February 2008, the FASB deferred the effective date of SFAS No. 157 for one year for nonfinancial assets and nonfinancial liabilities that are recognized or disclosed at fair value in the financial statements on a
nonrecurring basis. The FASB also removed certain leasing transactions from the scope of SFAS No. 157. On January 1, 2008, we adopted SFAS No. 157. We have financial instruments consisting of investments in securities and interest
rate contracts that are required to be measured under SFAS No. 157. We currently do not have any non-financial



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assets or non-financial liabilities that are required to be measured under SFAS No. 157. We do not have any fair value measurements using significant
unobservable inputs (Level 3) as of December 31, 2008.

In February 2007, the FASB issued SFAS No. 159, The Fair Value
Option for Financial Assets and Financial LiabilitiesIncluding an amendment of FASB Statement No. 115 (SFAS No. 159). SFAS No. 159 permits entities to choose, at specified election dates, to measure many
financial instruments and certain other items at fair value that are not currently required to be measured at fair value. Unrealized gains and losses shall be reported on items for which the fair value option has been elected in earnings at each
subsequent reporting date. SFAS No. 159 became effective for fiscal years beginning after November 15, 2007. On January 1, 2008, we adopted SFAS No. 159 and have currently not elected to measure any financial instruments or other
items (not currently required to be measured at fair value) at fair value.

In December 2007, the FASB issued SFAS No. 141
(revised 2007), Business Combinations (SFAS No. 141(R)), which establishes principles and requirements for how the acquirer shall recognize and measure in its financial statements the identifiable assets acquired,
liabilities assumed, any noncontrolling interest in the acquiree and goodwill acquired in a business combination. SFAS No. 141(R) is effective for business combinations for which the acquisition date is on or after the beginning of the first
annual reporting period beginning on or after December 15, 2008. We do not expect the adoption of SFAS No. 141(R) to have a material impact on our financial position and results of operations

In December 2007, the FASB issued SFAS No. 160, Noncontrolling Interests in Consolidated Financial Statementsan Amendment of ARB
No. 51 (SFAS No. 160), which establishes and expands accounting and reporting standards for minority interests, which will be recharacterized as noncontrolling interests, in a subsidiary and the deconsolidation of a
subsidiary. SFAS No. 160 is effective for business combinations for which the acquisition date is on or after the beginning of the first annual reporting period beginning on or after December 15, 2008. This statement is effective for
fiscal years beginning on or after December 15, 2008. We are currently assessing the potential impact that the adoption of SFAS No. 160 will have on our financial position and results of operations.

In March 2008, the FASB issued SFAS No. 161 Disclosures about Derivative Instruments and Hedging Activities (SFAS
No. 161). SFAS No. 161 amends and expands the disclosure requirements of SFAS No. 133 with the intent to provide users of financial statements with an enhanced understanding of how derivative instruments and hedging activities
affect an entitys financial position, financial performance and cash flows. These disclosure requirements include a tabular summary of the fair values of derivative instruments and their gains and losses, disclosure of derivative features that
are credit risk related to provide more information regarding an entitys liquidity and cross-referencing within footnotes to make it easier for financial statement users to locate important information about derivative instruments. SFAS
No. 161 is effective for financial statements issued for fiscal years and interim periods beginning after November 15, 2008 with early application encouraged. We do not expect the adoption of SFAS No. 161 to have a material impact to
us.

On May 9, 2008, the FASB issued FASB Staff Position No. (FSP) APB 14-1 Accounting for Convertible Debt
Instruments That May Be Settled in Cash upon Conversion (Including Partial Cash Settlement) (FSP No. APB 14-1) that requires the liability and equity components of convertible debt instruments that may be settled in cash upon
conversion (including partial cash settlement) to be separately accounted for in a manner that reflects the issuers nonconvertible debt borrowing rate. FSP No. APB 14-1 requires that the initial proceeds from our sale of $862.5 million of
2.875% exchangeable senior notes due 2037, $450.0 million of 3.75% exchangeable senior notes due 2036 and $747.5 million of 3.625% exchangeable senior notes due 2014 be allocated between a liability component and an equity component in a manner that
reflects interest expense at the interest rate of similar nonconvertible debt. The resulting debt discount will be amortized over the period during which the debt is expected to be outstanding (i.e., through the first optional redemption dates) as
additional non-cash interest expense. Based on our understanding of the application of FSP No. APB 14-1, this will result in



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an aggregate of approximately $0.15$0.16 per share (net of incremental capitalized interest) of additional non-cash interest expense for fiscal 2008
and approximately $0.23$0.24 per share for fiscal 2009. Excluding the impact of capitalized interest, the additional non-cash interest expense will be approximately $0.19$0.20 per share for fiscal 2008 and approximately $0.27$0.28
per share for fiscal 2009. The additional non-cash interest expense (before netting) will increase in subsequent reporting periods through the first optional redemption dates as the debt accretes to its par value over the same period. FSP No. APB
14-1 is effective for fiscal years beginning after December 15, 2008, and interim periods within those fiscal years. Early adoption is not permitted. Upon adoption FSP No. APB 14-1 requires companies to retrospectively apply the requirements of
the pronouncement to all periods presented. Our current estimate of the incremental interest expense excluding the impact of capitalized interest for each reporting period is as follows:



|                                |  |                   |       
|------------------------------- |  | ----------------- | ------
|For the year ended December 31: |  | ApproximateAmount
|                                |  | (in thousands)   
|2006                            |  | $                 | 4,200 
|2007                            |  |                   | 19,300
|2008                            |  |                   | 27,700
|2009                            |  |                   | 38,600
|2010                            |  |                   | 41,200
|2011                            |  |                   | 43,900
|2012                            |  |                   | 29,800
|2013                            |  |                   | 23,000
|2014                            |  |                   | 2,500 

In May 2008, the FASB issued SFAS No. 162, The Hierarchy of Generally Accepted
Accounting Principles (SFAS No. 162), which is intended to improve financing reporting by identifying a consistent framework or hierarchy for selecting accounting principles to be used in preparing financial statements of
nongovernmental entities that are presented in conformity with generally accepted accounting principles (GAAP) in the United States (the GAAP hierarchy). SFAS No. 162 is effective 60 days following the Securities and Exchange Commissions
(SEC) approval of the Public Company Accounting Oversight Board amendment to AU Section 411, The Meaning of Present Fairly in Conformity with Generally Accepted Accounting Principles. We do not expect the adoption of
SFAS No. 162 to have a material impact on us.

In June 2008, the FASB issued FSP EITF 03-06-1, Determining Whether Instruments
Granted in Share-Based Payment Transactions are Participating Securities (FSP EITF 03-06-1). FSP EITF 03-06-1 clarifies that unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend
equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of EPS pursuant to the two-class method. FSP EITF 03-06-1 is effective for financial statements issued for fiscal years beginning after
December 15, 2008, and interim periods within those fiscal years. All prior-period EPS data presented shall be adjusted retrospectively (including interim financial statements, summaries of earnings, and selected financial data) to conform with
the provisions of the FSP. Early application is not permitted. We do not expect the adoption of FSP EITF 03-06-1 to have a material impact on us.

Inflation

Substantially all of our leases provide for separate real estate tax and operating expense escalations over a
base amount. In addition, many of our leases provide for fixed base rent increases or indexed increases. We believe that inflationary increases in costs may be at least partially offset by the contractual rent increases and operating expense
escalations.



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|Item 7A. | Quantitative and Qualitative Disclosures about Market Risk
|-------- | ----------------------------------------------------------

As of December 31, 2008, approximately $5.9 billion of our borrowings bore interest at fixed rates, and therefore the fair value of these instruments is affected by changes in the market interest rates. The
following table presents our aggregate fixed rate debt obligations as of December 31, 2008 with corresponding weighted-average interest rates sorted by maturity date and our aggregate variable rate debt obligations sorted by maturity date. The
GAAP weighted average interest rate on the variable rate debt as of December 31, 2008 was 3.62% per annum.



|                            |  |                        |         |   |      |   |         |      |  |   |         |   |  |      |         |   |       |   |           |       |  |   |            |   |  |   |           |   |  |   |          
|--------------------------- |  | ---------------------- | ------- | - | ---- | - | ------- | ---- |  | - | ------- | - |  | ---- | ------- | - | ----- | - | --------- | ----- |  | - | ---------- | - |  | - | --------- | - |  | - | ---------
|                            |  | 2009                   |         |   | 2010 |   |         | 2011 |  |   | 2012    |   |  | 2013 |         |   | 2014+ |   |           | Total |  |   | Fair Value
|                            |  | (dollars in thousands)
|Secured debt                |  |                        |         |   |      |   |         |      |  |   |         |   |  |      |         |   |       |   |           |       |  |   |            |   |  |   |           |   |  |   |          
|Fixed Rate                  |  | $                      | 95,685  |   |      | $ | 134,803 |      |  | $ | 551,720 |   |  | $    | 106,642 |   |       | $ | 101,068   |       |  | $ | 1,385,232  |   |  | $ | 2,375,150 |   |  | $ | 2,239,309
|Average Interest Rate       |  |                        | 6.38    | % |      |   | 7.83    | %    |  |   | 7.02    | % |  |      | 5.68    | % |       |   | 6.03      | %     |  |   | 5.97       | % |  |   | 6.33      | % |  |   |          
|Variable Rate               |  |                        | 183,125 |   |      |   | 30,674  |      |  |   | 71,693  |   |  |      |        |   |       |   |          |       |  |   |           |   |  | $ | 285,492   |   |  | $ | 282,263  
|Unsecured debt              |  |                        |         |   |      |   |         |      |  |   |         |   |  |      |         |   |       |   |           |       |  |   |            |   |  |   |           |   |  |   |          
|Fixed Rate                  |  |                        |        |   |      |   |        |      |  |   |        |   |  |      |        |   |       | $ | 923,580   |       |  | $ | 548,795    |   |  | $ | 1,472,375 |   |  | $ | 1,202,875
|Average Interest Rate       |  |                        |        |   |      |   |        |      |  |   |        |   |  |      |        |   |       |   | 6.36      | %     |  |   | 5.47       | % |  |   | 5.95      | % |  |   |          
|Variable Rate               |  |                        |        |   |      |   | 100,000 |      |  |   |        |   |  |      |        |   |       |   |          |       |  |   |           |   |  | $ | 100,000   |   |  | $ | 100,111  
|Unsecured exchangeable debt |  |                        |         |   |      |   |         |      |  |   |         |   |  |      |         |   |       |   |           |       |  |   |            |   |  |   |           |   |  |   |          
|Fixed Rate                  |  |                        |        |   |      |   |        |      |  |   |        |   |  | $    | 848,410 |   |       | $ | 450,000   |       |  | $ | 740,489    |   |  | $ | 2,038,899 |   |  | $ | 1,571,536
|Average Interest Rate       |  |                        |        |   |      |   |        |      |  |   |        |   |  |      | 3.46    | % |       |   | 3.79      | %     |  |   | 4.04       | % |  |   | 3.65      | % |  |   |          
|Variable Rate               |  |                        |        |   |      |   |        |      |  |   |        |   |  |      |        |   |       |   |          |       |  |   |           |   |  |   |          |   |  |   |         
|                            |  |                        |         |   |      |   |         |      |  |   |         |   |  |      |         |   |       |   |           |       |  |   |            |   |  |   |           |   |  |   |          
|Total Debt                  |  | $                      | 278,810 |   |      | $ | 265,477 |      |  | $ | 623,413 |   |  | $    | 955,052 |   |       | $ | 1,474,648 |       |  | $ | 2,674,516  |   |  | $ | 6,271,916 |   |  | $ | 5,396,094
|                            |  |                        |         |   |      |   |         |      |  |   |         |   |  |      |         |   |       |   |           |       |  |   |            |   |  |   |           |   |  |   |          

Additional disclosure about market risk is incorporated herein by reference from
Managements Discussion and Analysis of Financial Condition and Results of OperationsLiquidity and Capital ResourcesMarket Risk.



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|Item 8. | Financial Statements and Supplementary Data
|------- | -------------------------------------------

BOSTON PROPERTIES LIMITED PARTNERSHIP

INDEX TO CONSOLIDATED FINANCIAL
STATEMENTS



|                                                                                                     |  |     
|---------------------------------------------------------------------------------------------------- |  | ----
|                                                                                                     |  | Page
|                                                                                                     | 
|Managements Report on Internal Control over Financial Reporting                                     |  | 100 
|                                                                                                     | 
|Report of Independent Registered Public Accounting Firm                                              |  | 101 
|                                                                                                     | 
|Consolidated Balance Sheets as of December 31, 2008 and 2007                                         |  | 102 
|                                                                                                     | 
|Consolidated Statements of Operations for the years ended December 31, 2008, 2007 and 2006           |  | 103 
|                                                                                                     | 
|Consolidated Statements of Partners Capital for the years ended December 31, 2008, 2007 and
2006    |  | 104 
|                                                                                                     | 
|Consolidated Statements of Comprehensive Income for the years ended December 31, 2008, 2007 and
2006 |  | 105 
|                                                                                                     | 
|Consolidated Statements of Cash Flows for the years ended December 31, 2008, 2007 and 2006           |  | 106 
|                                                                                                     | 
|Notes to Consolidated Financial Statements                                                           |  | 108 
|                                                                                                     | 
|Financial Statement ScheduleSchedule III                                                            |  | 157 

All other schedules for which a provision is made in the applicable accounting regulations of the
Securities and Exchange Commission are not required under the related instructions or are inapplicable, and therefore have been omitted.



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##### Table of Contents

Managements Report on Internal Control over Financial Reporting

Management of Boston Properties, Inc., the sole general partner of Boston Properties Limited Partnership (the Company) is
responsible for establishing and maintaining adequate internal control over financial reporting for the Company. The Companys internal control over financial reporting is a process designed under the supervision of the principal executive
officer and principal financial officer of Boston Properties, Inc. to provide reasonable assurance regarding the reliability of financial reporting and the preparation of the Companys financial statements for external reporting purposes in
accordance with U.S. generally accepted accounting principles.

As of the end of the Companys 2008 fiscal year, management
conducted assessments of the effectiveness of the Companys internal control over financial reporting based on the framework established in Internal ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the
Treadway Commission (COSO). Based on these assessments, management has determined that the Companys internal control over financial reporting as of December 31, 2008 was effective.

Our internal control over financial reporting includes policies and procedures that (1) pertain to the maintenance of records that, in reasonable
detail, accurately and fairly reflect transactions and dispositions of our assets; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with U.S. generally
accepted accounting principles, and that receipts and expenditures are being made only in accordance with authorizations of management and the directors of the Company; and (3) provide reasonable assurance regarding prevention or timely
detection of unauthorized acquisition, use or disposition of the Companys assets that could have a material effect on our financial statements.

The effectiveness of the Companys internal control over financial reporting as of December 31, 2008 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as
stated in their report appearing on page 101, which expresses an unqualified opinion on the effectiveness of the Companys internal control over financial reporting as of December 31, 2008.



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##### Table of Contents

Report of Independent Registered Public Accounting Firm

To the Partners of

Boston Properties Limited Partnership:

In our opinion, the consolidated financial statements listed in the accompanying index present fairly, in all material respects, the financial position
of Boston Properties Limited Partnership and its subsidiaries at December 31, 2008 and December 31, 2007, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2008 in
conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedule listed in the accompanying index presents fairly, in all material respects, the information set
forth therein when read in conjunction with the related consolidated financial statements. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2008, based
on criteria established in Internal ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Companys management is responsible for these financial statements and financial
statement schedule, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in Managements Report on Internal Control over Financial
Reporting appearing on page 100. Our responsibility is to express opinions on these financial statements, on the financial statement schedule, and on the Companys internal control over financial reporting based on our integrated audits. We
conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements
are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts
and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting
included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk.
Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

A companys internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial
reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A companys internal control over financial reporting includes those policies and procedures that
(i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as
necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors
of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the companys assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections
of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

Boston, Massachusetts

March 2, 2009



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BOSTON PROPERTIES LIMITED PARTNERSHIP

CONSOLIDATED BALANCE SHEETS





|                                                                                                                                                                                                                                                                                                                                                                                |  |                                        |            |   |                  |   |            |  
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | -------------------------------------- | ---------- | - | ---------------- | - | ---------- | -
|                                                                                                                                                                                                                                                                                                                                                                                |  | December 31,2008                       |            |   | December 31,2007 |  
|                                                                                                                                                                                                                                                                                                                                                                                |  | (in thousands, except for unitamounts) |           
|ASSETS                                                                                                                                                                                                                                                                                                                                                                          |  |                                        |            |   |                  |   |            |  
|Real estate, at cost:                                                                                                                                                                                                                                                                                                                                                           |  | $                                      | 10,178,198 |   |                  | $ | 9,831,390  |  
|Less: accumulated depreciation                                                                                                                                                                                                                                                                                                                                                  |  |                                        | (1,744,248 | ) |                  |   | (1,515,195 | )
|                                                                                                                                                                                                                                                                                                                                                                                |  |                                        |            |   |                  |   |            |  
|Total real estate                                                                                                                                                                                                                                                                                                                                                               |  |                                        | 8,433,950  |   |                  |   | 8,316,195  |  
|Cash and cash equivalents                                                                                                                                                                                                                                                                                                                                                       |  |                                        | 241,510    |   |                  |   | 1,506,921  |  
|Cash held in escrows                                                                                                                                                                                                                                                                                                                                                            |  |                                        | 21,970     |   |                  |   | 186,839    |  
|Investment in securities                                                                                                                                                                                                                                                                                                                                                        |  |                                        | 11,590     |   |                  |   | 22,584     |  
|Tenant and other receivables (net of allowance for doubtful accounts of $4,006 and $1,901, respectively)                                                                                                                                                                                                                                                                        |  |                                        | 68,743     |   |                  |   | 58,074     |  
|Related party note receivable                                                                                                                                                                                                                                                                                                                                                   |  |                                        | 270,000    |   |                  |   |           |  
|Accrued rental income (net of allowance of $15,440 and $829, respectively)                                                                                                                                                                                                                                                                                                      |  |                                        | 316,711    |   |                  |   | 300,594    |  
|Deferred charges, net                                                                                                                                                                                                                                                                                                                                                           |  |                                        | 326,401    |   |                  |   | 287,199    |  
|Prepaid expenses and other assets                                                                                                                                                                                                                                                                                                                                               |  |                                        | 22,401     |   |                  |   | 30,566     |  
|Investments in unconsolidated joint ventures                                                                                                                                                                                                                                                                                                                                    |  |                                        | 782,760    |   |                  |   | 81,672     |  
|                                                                                                                                                                                                                                                                                                                                                                                |  |                                        |            |   |                  |   |            |  
|Total assets                                                                                                                                                                                                                                                                                                                                                                    |  | $                                      | 10,496,036 |   |                  | $ | 10,790,644 |  
|                                                                                                                                                                                                                                                                                                                                                                                |  |                                        |            |   |                  |   |            |  
|LIABILITIES, REDEEMABLE PARTNERSHIP UNITS AND PARTNERS' CAPITAL                                                                                                                                                                                                                                                                                                                 |  |                                        |            |   |                  |   |            |  
|Liabilities:                                                                                                                                                                                                                                                                                                                                                                    |  |                                        |            |   |                  |   |            |  
|Mortgage notes payable                                                                                                                                                                                                                                                                                                                                                          |  | $                                      | 2,660,642  |   |                  | $ | 2,726,127  |  
|Unsecured senior notes (net of discount of $2,625 and $3,087, respectively)                                                                                                                                                                                                                                                                                                     |  |                                        | 1,472,375  |   |                  |   | 1,471,913  |  
|Unsecured exchangeable senior notes (net of discount of $21,101 and $18,374, respectively)                                                                                                                                                                                                                                                                                      |  |                                        | 2,038,899  |   |                  |   | 1,294,126  |  
|Unsecured line of credit                                                                                                                                                                                                                                                                                                                                                        |  |                                        | 100,000    |   |                  |   |           |  
|Accounts payable and accrued expenses                                                                                                                                                                                                                                                                                                                                           |  |                                        | 171,791    |   |                  |   | 145,692    |  
|Distributions payable                                                                                                                                                                                                                                                                                                                                                           |  |                                        | 97,162     |   |                  |   | 944,870    |  
|Accrued interest payable                                                                                                                                                                                                                                                                                                                                                        |  |                                        | 67,132     |   |                  |   | 54,487     |  
|Other liabilities                                                                                                                                                                                                                                                                                                                                                               |  |                                        | 173,750    |   |                  |   | 232,705    |  
|                                                                                                                                                                                                                                                                                                                                                                                |  |                                        |            |   |                  |   |            |  
|Total liabilities                                                                                                                                                                                                                                                                                                                                                               |  |                                        | 6,781,751  |   |                  |   | 6,869,920  |  
|                                                                                                                                                                                                                                                                                                                                                                                |  |                                        |            |   |                  |   |            |  
|Commitments and contingencies                                                                                                                                                                                                                                                                                                                                                   |  |                                        |           |   |                  |   |           |  
|                                                                                                                                                                                                                                                                                                                                                                                |  |                                        |            |   |                  |   |            |  
|Minority interests in property partnerships                                                                                                                                                                                                                                                                                                                                     |  |                                        | 6,900      |   |                  |   | 25,805     |  
|                                                                                                                                                                                                                                                                                                                                                                                |  |                                        |            |   |                  |   |            |  
|Redeemable partnership units1,113,044 and 1,113,044 preferred units outstanding (1,460,688 and 1,460,688 common units at redemption
value, if converted) at December 31, 2008 and 2007, respectively, and 19,909,070 and 20,271,341 common units and 946,509 and 676,067 long term incentive units outstanding at redemption value at December 31, 2008 and 2007,
respectively |  |                                        | 1,227,395  |   |                  |   | 2,057,287  |  
|                                                                                                                                                                                                                                                                                                                                                                                |  |                                        |            |   |                  |   |            |  
|Partners capital1,420,362 and 1,404,499 general partner units and 119,760,293 and 118,097,986 limited partner units outstanding at
December 31, 2008 and 2007, respectively (such amounts are inclusive of accumulated other comprehensive loss of $29,916 and $29,191 at December 31, 2008 and 2007, respectively)                                                           |  |                                        | 2,479,990  |   |                  |   | 1,837,632  |  
|                                                                                                                                                                                                                                                                                                                                                                                |  |                                        |            |   |                  |   |            |  
|Total liabilities, redeemable partnership units and partners capital                                                                                                                                                                                                                                                                                                           |  | $                                      | 10,496,036 |   |                  | $ | 10,790,644 |  
|                                                                                                                                                                                                                                                                                                                                                                                |  |                                        |            |   |                  |   |            |  

The accompanying notes are an integral part of these financial statements.



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BOSTON PROPERTIES LIMITED PARTNERSHIP

CONSOLIDATED STATEMENTS OF OPERATIONS



|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ------------------------------------------- | --------- | - | ---- | - | --------- | ---- |  | - | --------- | -
|                                                                                                                                                                                                                                                          |  | For the Year Ended December 31,             |          
|                                                                                                                                                                                                                                                          |  | 2008                                        |           |   | 2007 |   |           | 2006 | 
|                                                                                                                                                                                                                                                          |  | (In thousands, except for per unit amounts) |          
|Revenue                                                                                                                                                                                                                                                   |  |                                             |           |   |      |   |           |      |  |   |           |  
|Rental:                                                                                                                                                                                                                                                   |  |                                             |           |   |      |   |           |      |  |   |           |  
|Base rent                                                                                                                                                                                                                                                 |  | $                                           | 1,129,215 |   |      | $ | 1,084,308 |      |  | $ | 1,092,545 |  
|Recoveries from tenants                                                                                                                                                                                                                                   |  |                                             | 204,732   |   |      |   | 184,929   |      |  |   | 178,491   |  
|Parking and other                                                                                                                                                                                                                                         |  |                                             | 68,105    |   |      |   | 64,982    |      |  |   | 57,080    |  
|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  
|Total rental revenue                                                                                                                                                                                                                                      |  |                                             | 1,402,052 |   |      |   | 1,334,219 |      |  |   | 1,328,116 |  
|Hotel revenue                                                                                                                                                                                                                                             |  |                                             | 36,872    |   |      |   | 37,811    |      |  |   | 33,014    |  
|Development and management services                                                                                                                                                                                                                       |  |                                             | 30,518    |   |      |   | 20,553    |      |  |   | 19,820    |  
|Interest and other                                                                                                                                                                                                                                        |  |                                             | 18,958    |   |      |   | 89,706    |      |  |   | 36,677    |  
|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  
|Total revenue                                                                                                                                                                                                                                             |  |                                             | 1,488,400 |   |      |   | 1,482,289 |      |  |   | 1,417,627 |  
|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  
|Expenses                                                                                                                                                                                                                                                  |  |                                             |           |   |      |   |           |      |  |   |           |  
|Operating                                                                                                                                                                                                                                                 |  |                                             |           |   |      |   |           |      |  |   |           |  
|Rental                                                                                                                                                                                                                                                    |  |                                             | 488,030   |   |      |   | 455,840   |      |  |   | 437,705   |  
|Hotel                                                                                                                                                                                                                                                     |  |                                             | 27,510    |   |      |   | 27,765    |      |  |   | 24,966    |  
|General and administrative                                                                                                                                                                                                                                |  |                                             | 72,365    |   |      |   | 69,882    |      |  |   | 59,375    |  
|Interest                                                                                                                                                                                                                                                  |  |                                             | 271,972   |   |      |   | 285,887   |      |  |   | 298,260   |  
|Depreciation and amortization                                                                                                                                                                                                                             |  |                                             | 296,122   |   |      |   | 278,249   |      |  |   | 266,411   |  
|Net derivative losses                                                                                                                                                                                                                                     |  |                                             | 17,021    |   |      |   |          |      |  |   |          |  
|Losses from investments in securities                                                                                                                                                                                                                     |  |                                             | 4,604     |   |      |   |          |      |  |   |          |  
|Losses from early extinguishments of debt                                                                                                                                                                                                                 |  |                                             |          |   |      |   | 3,417     |      |  |   | 32,143    |  
|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  
|Total expenses                                                                                                                                                                                                                                            |  |                                             | 1,177,624 |   |      |   | 1,121,040 |      |  |   | 1,118,860 |  
|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  
|Income before minority interests in property partnerships, income (loss) from unconsolidated joint ventures, gains on sales of real estate and
other assets, discontinued operations and preferred distributions and allocation of undistributed earnings |  |                                             | 310,776   |   |      |   | 361,249   |      |  |   | 298,767   |  
|Minority interests in property partnerships                                                                                                                                                                                                               |  |                                             | (1,997    | ) |      |   | (84       | )    |  |   | 2,013     |  
|Income (loss) from unconsolidated joint ventures                                                                                                                                                                                                          |  |                                             | (182,018  | ) |      |   | 20,428    |      |  |   | 24,507    |  
|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  
|Income before gains on sales of real estate and other assets, discontinued operations and preferred distributions and allocation of
undistributed earnings                                                                                                |  |                                             | 126,761   |   |      |   | 381,593   |      |  |   | 325,287   |  
|Gains on sales of real estate and other assets                                                                                                                                                                                                            |  |                                             | 33,340    |   |      |   | 957,406   |      |  |   | 727,131   |  
|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  
|Income before discontinued operations and preferred distributions and allocation of undistributed earnings                                                                                                                                                |  |                                             | 160,101   |   |      |   | 1,338,999 |      |  |   | 1,052,418 |  
|Discontinued operations:                                                                                                                                                                                                                                  |  |                                             |           |   |      |   |           |      |  |   |           |  
|Income from discontinued operations                                                                                                                                                                                                                       |  |                                             |          |   |      |   | 7,274     |      |  |   | 19,081    |  
|Gains on sales of real estate from discontinued operations                                                                                                                                                                                                |  |                                             |          |   |      |   | 266,817   |      |  |   |          |  
|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  
|Income before preferred distributions and allocation of undistributed earnings                                                                                                                                                                            |  |                                             | 160,101   |   |      |   | 1,613,090 |      |  |   | 1,071,499 |  
|Preferred distributions and allocation of undistributed earnings                                                                                                                                                                                          |  |                                             | (4,226    | ) |      |   | (15,014   | )    |  |   | (22,814   | )
|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  
|Net income available to common unitholders                                                                                                                                                                                                                |  | $                                           | 155,875   |   |      | $ | 1,598,076 |      |  | $ | 1,048,685 |  
|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  
|Basic earnings per common unit:                                                                                                                                                                                                                           |  |                                             |           |   |      |   |           |      |  |   |           |  
|Income available to common unitholders before discontinued operations                                                                                                                                                                                     |  | $                                           | 1.11      |   |      | $ | 9.50      |      |  | $ | 7.58      |  
|Discontinued operations                                                                                                                                                                                                                                   |  |                                             |          |   |      |   | 1.97      |      |  |   | 0.14      |  
|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  
|Net income available to common unitholders                                                                                                                                                                                                                |  | $                                           | 1.11      |   |      | $ | 11.47     |      |  | $ | 7.72      |  
|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  
|Weighted average number of common units outstanding                                                                                                                                                                                                       |  |                                             | 140,336   |   |      |   | 139,290   |      |  |   | 135,923   |  
|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  
|Diluted earnings per common unit:                                                                                                                                                                                                                         |  |                                             |           |   |      |   |           |      |  |   |           |  
|Income available to common unitholders before discontinued operations                                                                                                                                                                                     |  | $                                           | 1.10      |   |      | $ | 9.38      |      |  | $ | 7.44      |  
|Discontinued operations                                                                                                                                                                                                                                   |  |                                             |          |   |      |   | 1.94      |      |  |   | 0.14      |  
|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  
|Net income available to common unitholders                                                                                                                                                                                                                |  | $                                           | 1.10      |   |      | $ | 11.32     |      |  | $ | 7.58      |  
|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  
|Weighted average number of common and common equivalent units outstanding                                                                                                                                                                                 |  |                                             | 141,655   |   |      |   | 141,231   |      |  |   | 138,279   |  
|                                                                                                                                                                                                                                                          |  |                                             |           |   |      |   |           |      |  |   |           |  

The accompanying notes are an integral part of these financial statements.



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BOSTON PROPERTIES LIMITED PARTNERSHIP

CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL

FOR THE YEARS ENDED DECEMBER 31, 2008, 2007 AND 2006

(dollars in thousands)



|                                                                       |  |                       |            |  
|---------------------------------------------------------------------- |  | --------------------- | ---------- | -
|                                                                       |  | TotalPartnersCapital |           
|Balance at December 31, 2005                                           |  | $                     | 1,522,195  |  
|                                                                       | 
|Contributions                                                          |  |                       | 63,093     |  
|Net income allocable to general and limited partner units              |  |                       | 885,091    |  
|Distributions                                                          |  |                       | (947,585   | )
|Accumulated other comprehensive income                                 |  |                       | 5,558      |  
|Unearned compensation                                                  |  |                       | 3,806      |  
|Conversion of redeemable partnership units                             |  |                       | 87,347     |  
|Adjustment to reflect redeemable partnership units at redemption value |  |                       | (756,996   | )
|                                                                       |  |                       |            |  
|Balance at December 31, 2006                                           |  |                       | 862,509    |  
|                                                                       | 
|Contributions                                                          |  |                       | 24,226     |  
|Net income allocable to general and limited partner units              |  |                       | 1,363,431  |  
|Distributions                                                          |  |                       | (1,038,521 | )
|Accumulated other comprehensive loss                                   |  |                       | (25,868    | )
|Unearned compensation                                                  |  |                       | 1,916      |  
|Conversion of redeemable partnership units                             |  |                       | 30,590     |  
|Adjustment to reflect redeemable partnership units at redemption value |  |                       | 619,349    |  
|                                                                       |  |                       |            |  
|Balance at December 31, 2007                                           |  |                       | 1,837,632  |  
|                                                                       | 
|Contributions                                                          |  |                       | 37,729     |  
|Capped call transaction costs                                          |  |                       | (44,360    | )
|Net income allocable to general and limited partner units              |  |                       | 133,265    |  
|Distributions                                                          |  |                       | (326,713   | )
|Accumulated other comprehensive loss                                   |  |                       | (725       | )
|Unearned compensation                                                  |  |                       | 1,149      |  
|Conversion of redeemable partnership units                             |  |                       | 10,906     |  
|Adjustment to reflect redeemable partnership units at redemption value |  |                       | 831,107    |  
|                                                                       |  |                       |            |  
|Balance at December 31, 2008                                           |  | $                     | 2,479,990  |  
|                                                                       |  |                       |            |  

The accompanying notes are an integral part of these financial statements.



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BOSTON PROPERTIES LIMITED PARTNERSHIP

CONSOLIDATED STATEMENTS OF

COMPREHENSIVE INCOME



|                                                                               |  |                                 |         |   |      |   |           |      |  |   |          
|------------------------------------------------------------------------------ |  | ------------------------------- | ------- | - | ---- | - | --------- | ---- |  | - | ---------
|                                                                               |  | For the year ended December 31,
|                                                                               |  | 2008                            |         |   | 2007 |   |           | 2006
|                                                                               |  | (in thousands)                 
|Income before preferred distributions and allocation of undistributed earnings |  | $                               | 160,101 |   |      | $ | 1,613,090 |      |  | $ | 1,071,499
|Other comprehensive income (loss):                                             |  |                                 |         |   |      |   |           |      |  |   |          
|Net effective portion of interest rate contracts                               |  |                                 | (727    | ) |      |   | (25,656   | )    |  |   | 4,860    
|Amortization of interest rate contracts                                        |  |                                 | 2       |   |      |   | (212      | )    |  |   | 698      
|                                                                               |  |                                 |         |   |      |   |           |      |  |   |          
|Other comprehensive income (loss)                                              |  |                                 | (725    | ) |      |   | (25,868   | )    |  |   | 5,558    
|                                                                               |  |                                 |         |   |      |   |           |      |  |   |          
|Comprehensive income                                                           |  | $                               | 159,376 |   |      | $ | 1,587,222 |      |  | $ | 1,077,057
|                                                                               |  |                                 |         |   |      |   |           |      |  |   |          

The accompanying notes are an integral part of these financial statements.



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BOSTON PROPERTIES LIMITED PARTNERSHIP

CONSOLIDATED STATEMENTS OF CASH FLOWS



|                                                                                                                                                         |  |                                 |            |   |      |   |            |      |  |   |           |  
|-------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ------------------------------- | ---------- | - | ---- | - | ---------- | ---- |  | - | --------- | -
|                                                                                                                                                         |  | For the year ended December 31, |           
|                                                                                                                                                         |  | 2008                            |            |   | 2007 |   |            | 2006 | 
|                                                                                                                                                         |  | (in thousands)                  |           
|Cash flows from operating activities:                                                                                                                    |  |                                 |            |   |      |   |            |      |  |   |           |  
|Net income before preferred distributions and allocation of undistributed earnings                                                                       |  | $                               | 160,101    |   |      | $ | 1,613,090  |      |  | $ | 1,071,499 |  
|Adjustments to reconcile net income before preferred distributions and allocation of undistributed earnings to net cash provided by operating
activities |  |                                 |            |   |      |   |            |      |  |   |           |  
|Depreciation and amortization                                                                                                                            |  |                                 | 296,122    |   |      |   | 281,197    |      |  |   | 272,608   |  
|Non-cash portion of interest expense                                                                                                                     |  |                                 | 11,570     |   |      |   | 9,397      |      |  |   | 7,111     |  
|Non-cash compensation expense                                                                                                                            |  |                                 | 23,106     |   |      |   | 12,358     |      |  |   | 8,578     |  
|Non-cash rental revenue                                                                                                                                  |  |                                 | (2,023     | ) |      |   |           |      |  |   |          |  
|Losses on investments in securities                                                                                                                      |  |                                 | 4,604      |   |      |   |           |      |  |   |          |  
|Net derivative losses                                                                                                                                    |  |                                 | 17,021     |   |      |   |           |      |  |   |          |  
|Losses from early extinguishments of debt                                                                                                                |  |                                 |           |   |      |   | 838        |      |  |   | 31,877    |  
|Minority interest in property partnerships                                                                                                               |  |                                 | 1,997      |   |      |   | 84         |      |  |   | (2,013    | )
|(Income) loss from unconsolidated joint ventures                                                                                                         |  |                                 | 182,018    |   |      |   | (20,428    | )    |  |   | (24,507   | )
|Distributions of net cash flow from operations of unconsolidated joint ventures                                                                          |  |                                 | 9,589      |   |      |   | 7,157      |      |  |   | 8,205     |  
|Gains on sales of real estate and other assets                                                                                                           |  |                                 | (33,340    | ) |      |   | (1,224,223 | )    |  |   | (727,131  | )
|Change in assets and liabilities:                                                                                                                        |  |                                 |            |   |      |   |            |      |  |   |           |  
|Cash held in escrows                                                                                                                                     |  |                                 | 3,548      |   |      |   | (2,564     | )    |  |   | (166      | )
|Tenant and other receivables, net                                                                                                                        |  |                                 | 2,663      |   |      |   | (1,341     | )    |  |   | (7,051    | )
|Accrued rental income, net                                                                                                                               |  |                                 | (20,001    | ) |      |   | (38,303    | )    |  |   | (53,989   | )
|Prepaid expenses and other assets                                                                                                                        |  |                                 | (2,642     | ) |      |   | 10,686     |      |  |   | 4,319     |  
|Accounts payable and accrued expenses                                                                                                                    |  |                                 | 5,762      |   |      |   | 3,833      |      |  |   | (2,502    | )
|Accrued interest payable                                                                                                                                 |  |                                 | 12,645     |   |      |   | 7,046      |      |  |   | (470      | )
|Other liabilities                                                                                                                                        |  |                                 | (54,023    | ) |      |   | 5,318      |      |  |   | (9,735    | )
|Tenant leasing costs                                                                                                                                     |  |                                 | (57,809    | ) |      |   | (34,767    | )    |  |   | (48,654   | )
|                                                                                                                                                         |  |                                 |            |   |      |   |            |      |  |   |           |  
|Total adjustments                                                                                                                                        |  |                                 | 400,807    |   |      |   | (983,712   | )    |  |   | (543,520  | )
|                                                                                                                                                         |  |                                 |            |   |      |   |            |      |  |   |           |  
|Net cash provided by operating activities                                                                                                                |  |                                 | 560,908    |   |      |   | 629,378    |      |  |   | 527,979   |  
|                                                                                                                                                         |  |                                 |            |   |      |   |            |      |  |   |           |  
|Cash flows from investing activities:                                                                                                                    |  |                                 |            |   |      |   |            |      |  |   |           |  
|Acquisitions/additions to real estate                                                                                                                    |  |                                 | (575,974   | ) |      |   | (1,132,594 | )    |  |   | (642,024  | )
|Investments in securities                                                                                                                                |  |                                 |           |   |      |   | (22,584    | )    |  |   | (282,764  | )
|Proceeds from redemptions of investments in securities                                                                                                   |  |                                 | 14,697     |   |      |   |           |      |  |   |          |  
|Net investments in unconsolidated joint ventures                                                                                                         |  |                                 | (896,027   | ) |      |   | (7,790     | )    |  |   | 23,566    |  
|Cash recorded upon consolidation                                                                                                                         |  |                                 |           |   |      |   | 3,232      |      |  |   |          |  
|Net proceeds from the sale/financing of real estate placed in escrow                                                                                     |  |                                 |           |   |      |   | (161,321   | )    |  |   | (872,063  | )
|Net proceeds from the sale/financing of real estate released from escrow                                                                                 |  |                                 | 161,321    |   |      |   |           |      |  |   | 872,063   |  
|Issuance of note receivable                                                                                                                              |  |                                 | (270,000   | ) |      |   |           |      |  |   |          |  
|Proceeds from note receivable                                                                                                                            |  |                                 | 123,000    |   |      |   |           |      |  |   |          |  
|Net proceeds from the sales of real estate and other assets                                                                                              |  |                                 | 127,307    |   |      |   | 1,897,988  |      |  |   | 1,130,978 |  
|                                                                                                                                                         |  |                                 |            |   |      |   |            |      |  |   |           |  
|Net cash provided by (used in) investing activities                                                                                                      |  |                                 | (1,315,676 | ) |      |   | 576,931    |      |  |   | 229,756   |  
|                                                                                                                                                         |  |                                 |            |   |      |   |            |      |  |   |           |  

The accompanying notes are an integral part of these financial statements.



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CONSOLIDATED STATEMENTS OF CASH FLOWS



|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|-------------------------------------------------------------------------------------------------- |  | ------------------------------- | ---------- | - | ---- | - | ---------- | ---- |  | - | -------- | -
|                                                                                                   |  | For the year ended December 31, |           
|                                                                                                   |  | 2008                            |            |   | 2007 |   |            | 2006 | 
|                                                                                                   |  | (in thousands)                  |           
|Cash flows from financing activities:                                                              |  |                                 |            |   |      |   |            |      |  |   |          |  
|Borrowings on unsecured line of credit                                                             |  |                                 | 1,391,000  |   |      |   | 260,000    |      |  |   | 195,000  |  
|Repayments of unsecured line of credit                                                             |  |                                 | (1,291,000 | ) |      |   | (260,000   | )    |  |   | (253,000 | )
|Repayments of mortgage notes payable                                                               |  |                                 | (603,054   | ) |      |   | (1,196,618 | )    |  |   | (408,139 | )
|Proceeds from mortgage notes payable                                                               |  |                                 | 537,569    |   |      |   | 1,097,369  |      |  |   | 41,887   |  
|Proceeds from unsecured exchangeable senior notes                                                  |  |                                 | 740,025    |   |      |   | 840,363    |      |  |   | 450,000  |  
|Proceeds from real estate financing transactions                                                   |  |                                 |           |   |      |   | 1,610      |      |  |   | 21,195   |  
|Payments on real estate financing transactions                                                     |  |                                 | (6,208     | ) |      |   | (10,610    | )    |  |   | (5,987   | )
|Advance from joint venture partners                                                                |  |                                 | 30,000     |   |      |   |           |      |  |   |         |  
|Repayment of advance from joint venture partners                                                   |  |                                 | (30,000    | ) |      |   |           |      |  |   |         |  
|Distributions                                                                                      |  |                                 | (1,235,767 | ) |      |   | (1,143,470 | )    |  |   | (391,613 | )
|Partner contributions                                                                              |  |                                 | 37,410     |   |      |   | 23,479     |      |  |   | 63,418   |  
|Capped call transaction costs                                                                      |  |                                 | (44,360    | ) |      |   |           |      |  |   |         |  
|Contributions from (distributions to) minority interest holders, net                               |  |                                 | (20,909    | ) |      |   | 4,304      |      |  |   | 11,404   |  
|Redemption of minority interest                                                                    |  |                                 |           |   |      |   | (35,625    | )    |  |   | (14,891  | )
|Deferred financing costs                                                                           |  |                                 | (15,349    | ) |      |   | (5,978     | )    |  |   | (2,717   | )
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Net cash used in financing activities                                                              |  |                                 | (510,643   | ) |      |   | (425,176   | )    |  |   | (293,443 | )
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Net increase (decrease) in cash and cash equivalents                                               |  |                                 | (1,265,411 | ) |      |   | 781,133    |      |  |   | 464,292  |  
|Cash and cash equivalents, beginning of period                                                     |  |                                 | 1,506,921  |   |      |   | 725,788    |      |  |   | 261,496  |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Cash and cash equivalents, end of period                                                           |  | $                               | 241,510    |   |      | $ | 1,506,921  |      |  | $ | 725,788  |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Supplemental disclosures:                                                                          |  |                                 |            |   |      |   |            |      |  |   |          |  
|Cash paid for interest                                                                             |  | $                               | 289,640    |   |      | $ | 300,490    |      |  | $ | 297,541  |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Interest capitalized                                                                               |  | $                               | 41,883     |   |      | $ | 31,046     |      |  | $ | 5,921    |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Non-cash investing and financing activities:                                                       |  |                                 |            |   |      |   |            |      |  |   |          |  
|Additions to real estate included in accounts payable                                              |  | $                               | 18,075     |   |      | $ | 3,827      |      |  | $ | 4,419    |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Mortgage notes payable assumed in connection with the acquisition of real estate                   |  | $                               |           |   |      | $ | 65,224     |      |  | $ |         |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Real estate recorded upon consolidation                                                            |  | $                               |           |   |      | $ | 120,213    |      |  | $ |         |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Mortgage notes payable recorded upon consolidation                                                 |  | $                               |           |   |      | $ | 79,064     |      |  | $ |         |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Minority interest recorded upon consolidation                                                      |  | $                               |           |   |      | $ | 19,588     |      |  | $ |         |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Distributions declared but not paid                                                                |  | $                               | 97,162     |   |      | $ | 944,870    |      |  | $ | 857,892  |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Issuance of OP Units in connection with the acquisition of real estate                             |  | $                               | 15,000     |   |      | $ |           |      |  | $ |         |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Issuance of OP Units in connection with an investment in an unconsolidated joint venture           |  | $                               | 10,000     |   |      | $ |           |      |  | $ |         |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Conversions of redeemable partnership units to partners' capital                                   |  | $                               | 10,906     |   |      | $ | 30,590     |      |  | $ | 87,347   |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Marketable securities transferred in connection with the legal defeasance of mortgage note payable |  | $                               |           |   |      | $ |           |      |  | $ | 282,764  |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Mortgage note payable legally defeased                                                             |  | $                               |           |   |      | $ |           |      |  | $ | 254,385  |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Financing incurred in connection with the acquisition of real estate                               |  | $                               |           |   |      | $ |           |      |  | $ | 45,559   |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Note receivable issued in connection with the transfer of real estate                              |  | $                               | 123,000    |   |      | $ |           |      |  | $ |         |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  
|Issuance of restricted units to employees                                                          |  | $                               | 43,536     |   |      | $ | 17,658     |      |  | $ | 11,279   |  
|                                                                                                   |  |                                 |            |   |      |   |            |      |  |   |          |  

The accompanying notes are an integral part of these financial statements.



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BOSTON PROPERTIES LIMITED PARTNERSHIP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



|1. | Organization and Basis of Presentation
|-- | --------------------------------------

Organization

Boston Properties Limited Partnership (the Company), a Delaware limited partnership, is the entity
through which Boston Properties, Inc., a self-administered and self-managed real estate investment trust (REIT), conducts substantially all of its business and owns (either directly or through subsidiaries) substantially all of its
assets. Boston Properties, Inc. is the sole general partner of the Company and at December 31, 2008 owned an approximate 84.4% (84.2% at December 31, 2007) general and limited partnership interest in the Company. Partnership interests in
the Company are denominated as common units of partnership interest (also referred to as OP Units), long term incentive units of partnership interest (also referred to as LTIP Units) or preferred
units of partnership interest (also referred to as Preferred Units). In addition, in February 2008, the Company issued LTIP Units in connection with the granting to employees of 2008 outperformance awards (also referred to as
2008 OPP Units). Because the rights, preferences and privileges of 2008 OPP Units differ from other LTIP Units granted to employees as part of the annual compensation process, unless specifically noted otherwise, all references to LTIP
Units exclude 2008 OPP Units. For a complete description of the terms of the 2008 OPP Units (See Note 18).

Unless specifically noted
otherwise, all references to OP Units exclude units held by Boston Properties, Inc. A holder of an OP Unit may present such OP Unit to the Company for redemption at any time (subject to restrictions agreed upon at the time of issuance of OP Units to
particular holders that may restrict such redemption right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Company must redeem such OP Unit for cash equal to the then value of a share of
common stock of Boston Properties, Inc. (Common Stock). In lieu of a cash redemption, Boston Properties, Inc. may elect to acquire such OP Unit for one share of Common Stock. Because the number of shares of Common Stock outstanding at
all times equals the number of OP Units that Boston Properties, Inc. owns, one share of Common Stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the
quarterly dividend that may be paid to the holder of a share of Common Stock. An LTIP Unit is generally the economic equivalent of a share of restricted common stock of Boston Properties, Inc. LTIP Units, whether vested or not, will receive the same
quarterly per unit distributions as OP Units, which equal per share dividends on Common Stock (See Note 18).

At December 31, 2008,
there was one series of Preferred Units outstanding (i.e., Series Two Preferred Units). The Series Two Preferred Units bear a distribution that is set in accordance with an amendment to the partnership agreement of the Company. Preferred Units may
also be converted into OP Units at the election of the holder thereof or the Company in accordance with the amendment to the partnership agreement (See Note 12).

All references to the Company refer to Boston Properties Limited Partnership and its consolidated subsidiaries, collectively, unless the context otherwise requires.

Properties

At December 31,
2008, the Company owned or had interests in a portfolio of 147 commercial real estate properties (139 properties at December 31, 2007) (the Properties) aggregating approximately 49.8 million net rentable square feet
(approximately 43.8 million net rentable square feet at December 31, 2007), including 10 properties under construction totaling approximately 3.8 million net rentable square feet, and structured parking for approximately 35,617
vehicles containing approximately 11.2 million square feet. At December 31, 2008, the Properties consist of:



| |  |  | 143 office properties, including 123 Class A office properties (including 10 properties under construction) and 20 Office/Technical properties;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



| |  |  | one hotel; and
| | - |  | --------------



| |  |  | three retail properties.
| | - |  | ------------------------

The
Company owns or controls undeveloped land parcels totaling approximately 509.3 acres. In addition, the Company has a minority interest in the Boston Properties Office Value-Added Fund, L.P. (the Value-Added Fund), which is a strategic
partnership with two institutional investors through which the Company has pursued the acquisition of value-added investments in assets within its existing markets. The Companys investments through the Value-Added Fund are not included in its
portfolio information or any other portfolio level statistics. At December 31, 2008, the Value-Added Fund had investments in 26 buildings comprised of an office property in Chelmsford, Massachusetts and office complexes in San Carlos,
California and Mountain View, California.

The Company considers Class A office properties to be centrally located buildings that are
professionally managed and maintained, that attract high-quality tenants and command upper-tier rental rates, and that are modern structures or have been modernized to compete with newer buildings. The Company considers Office/Technical properties
to be properties that support office, research and development, laboratory and other technical uses. Net rentable square feet amounts are unaudited.

Basis of Presentation

Boston Properties, Inc. does not have any other significant assets,
liabilities or operations, other than its investment in the Company, nor does it have employees of its own. The Company, not Boston Properties, Inc., executes all significant business relationships. All majority-owned subsidiaries and affiliates
over which the Company has financial and operating control and variable interest entities (VIEs) in which the Company has determined it is the primary beneficiary are included in the consolidated financial statements. All significant
intercompany balances and transactions have been eliminated in consolidation. The Company accounts for all other unconsolidated joint ventures using the equity method of accounting. Accordingly, the Companys share of the earnings of these
joint ventures and companies is included in consolidated net income.



|2. | Summary of Significant Accounting Policies
|-- | ------------------------------------------

Real
Estate

Upon acquisitions of real estate, the Company assesses the fair value of acquired tangible and intangible assets (including
land, buildings, tenant improvements, above- and below-market leases, origination costs, acquired in-place leases, other identified intangible assets and assumed liabilities in accordance with Statement of Financial
Accounting Standards (SFAS) No. 141, Business Combinations), and allocates the purchase price to the acquired assets and assumed liabilities, including land at appraised value and buildings at replacement cost. The
Company assesses and considers fair value based on estimated cash flow projections that utilize discount and/or capitalization rates that we deem appropriate, as well as available market information. Estimates of future cash flows are based on a
number of factors including the historical operating results, known and anticipated trends, and market and economic conditions. The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant.
The Company also considers an allocation of purchase price of other acquired intangibles, including acquired in-place leases that may have a customer relationship intangible value, including (but not limited to) the nature and extent of the existing
relationship with the tenants, the tenants credit quality and expectations of lease renewals. Based on its acquisitions to date, the Companys allocation to customer relationship intangible assets has been immaterial.

The Company records acquired above- and below-market leases at their fair value (using a discount rate which reflects the risks
associated with the leases acquired) equal to the difference between (1) the contractual



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



amounts to be paid pursuant to each in-place lease and (2) managements estimate of fair market lease rates for each corresponding in-place lease,
measured over a period equal to the remaining term of the lease for above-market leases and the initial term plus the term of any below-market fixed rate renewal options for below-market leases. Other intangible assets acquired include amounts for
in-place lease values that are based on the Companys evaluation of the specific characteristics of each tenants lease. Factors to be considered include estimates of carrying costs during hypothetical expected lease-up periods considering
current market conditions, and costs to execute similar leases. In estimating carrying costs, the Company includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up
periods, depending on local market conditions. In estimating costs to execute similar leases, the Company considers leasing commissions, legal and other related expenses.

Real estate is stated at depreciated cost. The cost of buildings and improvements includes the purchase price of property, legal fees and other acquisition costs. Costs directly related to the development of
properties are capitalized. Capitalized development costs include interest, internal wages, property taxes, insurance, and other project costs incurred during the period of development.

The Company reviews its long-lived assets used in operations for impairment following the end of each quarter and when there is an event or change in
circumstances that indicates an impairment in value. An impairment loss is recognized if the carrying amount of its assets is not recoverable and exceeds its fair value. If such impairment is present, an impairment loss is recognized based on the
excess of the carrying amount of the asset over its fair value. The evaluation of anticipated cash flows is highly subjective and is based in part on assumptions regarding future occupancy, rental rates and capital requirements that could differ
materially from actual results in future periods. Since cash flows on properties considered to be long-lived assets to be held and used, as defined by SFAS No. 144, Accounting for the Impairment or Disposal of Long-Lived
Assets, (SFAS No. 144) are considered on an undiscounted basis to determine whether an asset has been impaired, the Companys established strategy of holding properties over the long term directly decreases the likelihood
of recording an impairment loss. If the Companys strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized and such loss could be material. If the Company determines that impairment has
occurred, the affected assets must be reduced to their fair value.

SFAS No. 144, requires that qualifying assets and liabilities and
the results of operations that have been sold, or otherwise qualify as held for sale, be presented as discontinued operations in all periods presented if the property operations are expected to be eliminated and the Company will not have
significant continuing involvement following the sale. The components of the propertys net income that is reflected as discontinued operations include the net gain (or loss) upon the disposition of the property held for sale, operating
results, depreciation and interest expense (if the property is subject to a secured loan). The Company generally considers assets to be held for sale when the transaction has been approved by Boston Properties, Inc.s Board of
Directors, or a committee thereof, and there are no known significant contingencies relating to the sale, such that the property sale within one year is considered probable. Following the classification of a property as held for sale, no
further depreciation is recorded on the assets.

A variety of costs are incurred in the acquisition, development and leasing of properties.
After determination is made to capitalize a cost, it is allocated to the specific component of a project that is benefited. Determination of when a development project commences and capitalization begins, and when a development project is
substantially complete and held available for occupancy and capitalization must cease, involves a degree of judgment. The Companys capitalization policy on development properties is guided by SFAS No. 34 Capitalization of Interest
Cost and SFAS No. 67 Accounting for Costs and the Initial Rental Operations of Real Estate Projects. The costs of land and buildings under development include specifically identifiable costs. The capitalized costs include
pre-construction costs necessary to the development of the property, development



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



costs, construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. The
Company begins the capitalization of costs during the pre-construction period which it defines as activities that are necessary to the development of the property. The Company considers a construction project as substantially completed and held
available for occupancy upon the completion of tenant improvements, but no later than one year from cessation of major construction activity. The Company ceases capitalization on the portion (1) substantially completed and (2) occupied or
held available for occupancy, and capitalizes only those costs associated with the portion under construction. Interest costs capitalized for the years ended December 31, 2008, 2007 and 2006 were $41.9 million, $31.0 million and $5.9 million,
respectively. Salaries and related costs capitalized for the years ended December 31, 2008, 2007 and 2006 were $7.8 million, $6.9 million and $4.2 million, respectively.

Expenditures for repairs and maintenance are charged to operations as incurred. Significant betterments are capitalized. When assets are sold or retired,
their costs and related accumulated depreciation are removed from the accounts with the resulting gains or losses reflected in net income or loss for the period.

The Company computes depreciation and amortization on properties using the straight-line method based on estimated useful asset lives. In accordance with SFAS No. 141, the Company allocates the acquisition cost
of real estate to land, building, tenant improvements, acquired above- and below-market leases, origination costs and acquired in-place leases based on an assessment of their fair value and depreciates or amortizes these
assets (or liabilities) over their useful lives. The amortization of acquired above- and below-market leases and acquired in-place leases is recorded as an adjustment to revenue and depreciation and amortization,
respectively, in the Consolidated Statements of Operations.

Depreciation is computed on a straight-line basis over the estimated useful
lives of the assets as follows:



|                                   |  |                                                 
|---------------------------------- |  | ------------------------------------------------
|Land improvements                  |  | 25 to 40 years                                  
|Buildings and improvements         |  | 10 to 40 years                                  
|Tenant improvements                |  | Shorter of useful life or terms of related lease
|Furniture, fixtures, and equipment |  | 3 to 7 years                                    

Cash and Cash Equivalents

Cash and cash equivalents consist of cash on hand and investments with maturities of three months or less from the date of purchase. The majority of the
Companys cash and cash equivalents are held at major commercial banks which may at times exceed the Federal Deposit Insurance Corporation limit of $250,000. The Company has not experienced any losses to date on its invested cash.

Cash Held in Escrows

Escrows
include amounts established pursuant to various agreements for security deposits, property taxes, insurance and other costs.

Investment
in Securities

The Company accounts for investments in trading securities at fair value, with gains or losses resulting from
changes in fair value recognized currently in earnings. The designation of trading securities is generally determined at acquisition. At December 31, 2008, investment in securities is comprised of an investment in an unregistered money market
fund and investments in an account associated with the Companys deferred compensation plan (See Note 17). The investment in the unregistered money market fund was previously



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included in Cash and Cash Equivalents. In December 2007, the fund suspended cash redemptions by investors; investors may elect in-kind redemptions of the
underlying securities or maintain their investment in the fund and receive distributions as the underlying securities mature or are liquidated by the fund sponsor. As a result, the Company has retained this investment for a longer term than
originally intended, and the valuation of the Companys investment is subject to changes in market conditions. Because interests in this fund are now valued at less than their $1.00 par value, the Company recognized losses of approximately $1.4
million and $0.3 million on its investment during the years ended December 31, 2008 and 2007, respectively. The Company also maintains a deferred compensation plan that is designed to allow officers of the Company to defer a portion of their
current income on a pre-tax basis and receive a tax-deferred return on these deferrals. The Companys obligation under the plan is that of an unsecured promise to pay the deferred compensation to the plan participants in the future. At
December 31, 2008 and 2007, the Company has funded approximately $6.6 million and $8.3 million, respectively, into a separate account, which is not restricted as to its use. The Company recognized income (losses) of approximately $(3.2) million
and $0.3 million on its investments in the account associated with the Companys deferred compensation plan during the years ended December 31, 2008 and 2007, respectively.

Tenant and other receivables

Tenant
and other accounts receivable, other than accrued rents receivable, are expected to be collected within one year.

Deferred Charges

Deferred charges include leasing costs and financing fees. Leasing costs include an allocation for acquired intangible in-place lease
values and direct and incremental fees and costs incurred in the successful negotiation of leases, including brokerage, legal, internal leasing employee salaries and other costs which have been deferred and are being amortized on a straight-line
basis over the terms of the respective leases. Internal leasing salaries and related costs capitalized for the years ended December 31, 2008, 2007 and 2006 were $4.4 million, $4.1 million and $2.8 million, respectively. External fees and costs
incurred to obtain long-term financing have been deferred and are being amortized over the terms of the respective loans on a basis that approximates the effective interest method and are included with interest expense. Unamortized financing and
leasing costs are charged to expense upon the early repayment or significant modification of the financing or upon the early termination of the lease, respectively. Fully amortized deferred charges are removed from the books upon the expiration of
the lease or maturity of the debt.

Investments in Unconsolidated Joint Ventures

Except for ownership interests in variable interest entities for which the Company is the primary beneficiary, the Company accounts for its investments in
joint ventures under the equity method of accounting because it exercises significant influence over, but does not control, these entities. The Companys judgment with respect to its level of influence or control of an entity and whether it is
the primary beneficiary of a variable interest entity involves the consideration of various factors including the form of the Companys ownership interest, its representation in the entitys governance, the size of its investment
(including loans), estimates of future cash flows, its ability to participate in policy making decisions and the rights of the other investors to participate in the decision making process and to replace the Company as manager and/or liquidate the
venture, if applicable. The Companys assessment of its influence or control over an entity affects the presentation of these investments in the Companys consolidated financial statements.



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These investments are recorded initially at cost, as Investments in Unconsolidated Joint Ventures,
and subsequently adjusted for equity in earnings and cash contributions and distributions. Any difference between the carrying amount of these investments on the balance sheet and the underlying equity in net assets is amortized as an adjustment to
equity in earnings of unconsolidated joint ventures over the life of the related asset. Under the equity method of accounting, the net equity investment of the Company is reflected within the Consolidated Balance Sheets, and the Companys share
of net income or loss from the joint ventures is included within the Consolidated Statements of Operations. The joint venture agreements may designate different percentage allocations among investors for profits and losses, however, the
Companys recognition of joint venture income or loss generally follows the joint ventures distribution priorities, which may change upon the achievement of certain investment return thresholds. For ownership interests in variable
interest entities, the Company consolidates those in which it is the primary beneficiary. The Companys investments in unconsolidated joint ventures are reviewed for impairment periodically and the Company records impairment charges when events
or circumstances change indicating that a decline in the fair values below the carrying values has occurred and such decline is other-than-temporary. The ultimate realization of the investment in unconsolidated joint ventures is dependent on a
number of factors, including the performance of each investment and market conditions. The Company will record an impairment charge if it determines that a decline in the value of an investment in an unconsolidated joint venture is other than
temporary.

To the extent that the Company contributes assets to a joint venture, the Companys investment in the joint venture is
recorded at the Companys cost basis in the assets that were contributed to the joint venture. To the extent that the Companys cost basis is different than the basis reflected at the joint venture level, the basis difference is amortized
over the life of the related asset and included in the Companys share of equity in net income of the joint venture. In accordance with the provisions of Statement of Position 78-9 Accounting for Investments in Real Estate Ventures,
the Company will recognize gains on the contribution of real estate to joint ventures, relating solely to the outside partners interest, to the extent the economic substance of the transaction is a sale.

Revenue Recognition

Contractual
rental revenue is reported on a straight-line basis over the terms of the respective leases. The impact of the straight-line rent adjustment increased revenue by approximately $24.5 million, $39.1 million and $53.7 million for the years ended
December 31, 2008, 2007 and 2006, respectively, as the revenue recorded exceeded amounts billed. The straight-line rent adjustment for the year ended December 31, 2008 includes an approximately $21.0 million decrease due to the
establishment of reserves for the full amount of the accrued straight-line rent balances associated with two of the Companys leases in New York City. In accordance with SFAS No. 141, the Company recognizes rental revenue of acquired
in-place above- and below-market leases at their fair values over the terms of the respective leases. The impact of the acquired in-place above- and below-market leases increased revenue by
approximately $5.4 million, $5.9 million and $3.4 million for the years ended December 31, 2008, 2007 and 2006, respectively. Accrued rental income, as reported on the Consolidated Balance Sheets, represents rental income earned in excess of
rent payments received pursuant to the terms of the individual lease agreements. The Company maintains an allowance against accrued rental income for future potential tenant credit losses. The credit assessment is based on the estimated accrued
rental income that is recoverable over the term of the lease. The Company also maintains an allowance for doubtful accounts for estimated losses resulting from the inability of tenants to make required rent payments. The computation of this
allowance is based on the tenants payment history and current credit status, as well as certain industry or geographic specific credit considerations. If the Companys estimates of collectibility differ from the cash received, then the
timing and amount of the Companys reported revenue could be impacted. The credit risk is mitigated by the high quality of the Companys existing tenant base, reviews of prospective tenants risk profiles prior to lease execution and
consistent monitoring of the Companys portfolio to identify potential problem tenants.



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



Recoveries from tenants, consisting of amounts due from tenants for common area maintenance, real
estate taxes and other recoverable costs are recognized as revenue in the period during which the expenses are incurred. Tenant reimbursements are recognized and presented in accordance with EITF Issue 99-19 Reporting Revenue Gross as a
Principal versus Net as an Agent (Issue 99-19). Issue 99-19 requires that these reimbursements be recorded on a gross basis, as the Company is generally the primary obligor with respect to purchasing goods and services from third-
party suppliers, has discretion in selecting the supplier and has credit risk. The Company also receives reimbursement of payroll and payroll related costs from third parties which the Company reflects on a net basis in accordance with Issue 99-19.

The Companys hotel revenues are derived from room rentals and other sources such as charges to guests for long-distance telephone
service, fax machine use, movie and vending commissions, meeting and banquet room revenue and laundry services. Hotel revenues are recognized as earned.

The Company receives management and development fees from third parties. Management fees are recorded and earned based on a percentage of collected rents at the properties under management, and not on a straight-line
basis, because such fees are contingent upon the collection of rents. The Company reviews each development agreement and records development fees as earned depending on the risk associated with each project. Profit on development fees earned from
joint venture projects is recognized as revenue to the extent of the third party partners ownership interest.

Gains on sales of real
estate are recognized pursuant to the provisions of SFAS No. 66, Accounting for Sales of Real Estate. The specific timing of a sale is measured against various criteria in SFAS No. 66 related to the terms of the transaction and
any continuing involvement in the form of management or financial assistance associated with the properties. If the sales criteria are not met, the Company defers gain recognition and accounts for the continued operations of the property by applying
the finance, installment or cost recovery methods, as appropriate, until the sales criteria are met.

Earnings Per Common Unit

Basic earnings per common unit is computed by dividing net income available to common unitholders, as adjusted for unallocated earnings
(if any) of certain securities issued by the Company, by the weighted average number of common units outstanding during the year. Diluted earnings per common unit reflects the potential dilution that could occur from units issuable under Boston
Properties, Inc.s stock-based compensation plans, including upon the exercise of stock options, and conversion of preferred units of the Company.

Fair Value of Financial Instruments

The carrying values of cash and cash equivalents, marketable
securities, escrows, receivables, accounts payable, accrued expenses and other assets and liabilities are reasonable estimates of their fair values because of the short maturities of these instruments.

For purposes of disclosure, the Company calculates the fair value of mortgage notes payable and unsecured senior notes. The Company discounts the spread
between the future contractual interest payments and hypothetical future interest payments on mortgage debt and unsecured notes based on a current market rate. In determining the current market rate, the Company adds its estimation of a market
spread to the quoted yields on federal government treasury securities with similar maturity dates to its debt. Because the Companys valuations of its financial instruments are based on these types of estimates, the actual fair value of its
financial instruments may differ materially if the Companys estimates do not prove to be accurate. The aggregate carrying value of the Companys long-term indebtedness exceeded the fair value by approximately $875.8 million at
December 31, 2008.



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



Derivative Instruments and Hedging Activities

Derivative instruments and hedging activities require management to make judgments on the nature of its derivatives and their effectiveness as hedges.
These judgments determine if the changes in fair value of the derivative instruments are reported in the consolidated statements of operations as a component of net income or as a component of comprehensive income and as a component of equity on the
consolidated balance sheets. While management believes its judgments are reasonable, a change in a derivatives effectiveness as a hedge could materially affect expenses, net income and equity. The Company recognized net derivative losses of
approximately $17.0 million for the year ended December 31, 2008 (See Note 6).

Income Taxes

The partners are required to report their respective share of the Companys taxable income or loss on their respective tax returns and are liable for
any related taxes thereon. Accordingly, the only provision for federal income taxes in the accompanying consolidated financial statements relates to the Companys consolidated taxable REIT subsidiaries. The Companys taxable REIT
subsidiaries did not have significant tax provisions or deferred income tax items.

In January 2002, the Company formed a taxable REIT
subsidiary, IXP, Inc. (IXP) which acts as a captive insurance company and is one of the elements of its overall insurance program. On September 27, 2006, IXP, Inc. was merged into IXP, LLC, a wholly owned subsidiary, and all insurance policies
issued by IXP, Inc. were cancelled and reissued by IXP, LLC. The accounts of IXP are consolidated within the Company. IXP, Inc. was a captive TRS that was subject to tax at the federal and state level. Accordingly, the Company has recorded a tax
provision in the Companys Consolidated Statements of Operations for the year ended December 31, 2006.

Effective July 1,
2002, the Company restructured the leases with respect to its ownership of its hotel properties by forming a taxable REIT subsidiary. The hotel taxable REIT subsidiary, a wholly owned subsidiary of the Company, is the lessee pursuant to leases for
each of the hotel properties. As lessor, the Company is entitled to a percentage of gross receipts from the hotel properties. Marriott International, Inc. continues to manage the hotel properties under the Marriott name and under terms of the
existing management agreements. In connection with the restructuring, the revenue and expenses of the hotel properties are being reflected in the Companys Consolidated Statements of Operations. The Company currently owns one hotel property.
The hotel taxable REIT subsidiary is subject to tax at the federal and state level and, accordingly, the Company has recorded a tax provision in the Companys Consolidated Statements of Operations for the years ended December 31, 2008,
2007 and 2006.

The net difference between the tax basis and the reported amounts of the Companys assets and liabilities is
approximately $949 million and $374 million as of December 31, 2008 and 2007, respectively, which is primarily related to the difference in basis of contributed property and accrued rental income.

Certain entities included in the Companys consolidated financial statements are subject to certain state and local taxes. These taxes are recorded
as operating expenses in the accompanying consolidated financial statements.



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



The following reconciles GAAP net income to taxable income:



|                                                                               |  |                                 |         |   |      |   |           |      |  |   |           |  
|------------------------------------------------------------------------------ |  | ------------------------------- | ------- | - | ---- | - | --------- | ---- |  | - | --------- | -
|                                                                               |  | For the year ended December 31, |        
|                                                                               |  | 2008                            |         |   | 2007 |   |           | 2006 | 
|                                                                               |  | (in thousands)                  |        
|Income before preferred distributions and allocation of undistributed earnings |  | $                               | 160,101 |   |      | $ | 1,613,090 |      |  | $ | 1,071,499 |  
|Straight-line rent adjustments                                                 |  |                                 | (24,025 | ) |      |   | (43,531   | )    |  |   | (57,713   | )
|Book/Tax differences from depreciation and amortization                        |  |                                 | 87,565  |   |      |   | 49,813    |      |  |   | 69,842    |  
|Book/Tax differences on gains/losses from capital transactions                 |  |                                 | (33,340 | ) |      |   | (356,606  | )    |  |   | 76,442    |  
|Book/Tax differences from stock-based compensation                             |  |                                 | (22,695 | ) |      |   | (52,109   | )    |  |   | (119,189  | )
|Impairment loss on investments in unconsolidated joint ventures                |  |                                 | 188,325 |   |      |   |          |      |  |   |          |  
|Other book/tax differences, net                                                |  |                                 | 11,582  |   |      |   | (15,490   | )    |  |   | (31,541   | )
|                                                                               |  |                                 |         |   |      |   |           |      |  |   |           |  
|Taxable income                                                                 |  | $                               | 367,513 |   |      | $ | 1,195,167 |      |  | $ | 1,009,340 |  
|                                                                               |  |                                 |         |   |      |   |           |      |  |   |           |  

Stock-based employee compensation plans

At December 31, 2008, Boston Properties, Inc. has a stock-based employee compensation plan. Effective January 1, 2005, the Company adopted the
fair value recognition provisions of Financial Accounting Standards Board (FASB) Statement of Financial Accounting Standards (SFAS) No. 123, Accounting for Stock-Based Compensation, as amended by SFAS
No. 148, Accounting for Stock-Based CompensationTransition and Disclosure, an amendment of FASB Statement No. 123, using the modified prospective application method for stock compensation awards. In addition, effective
January 1, 2005, the Company adopted early SFAS No. 123 (revised) (SFAS No. 123R), Share-Based Payment, which revised the fair value based method of accounting for share-based payment liabilities, forfeitures
and modifications of stock-based awards and clarified SFAS No. 123s guidance in several areas, including measuring fair value, classifying an award as equity or as a liability and attributing compensation cost to reporting periods.

Use of Estimates in the Preparation of Financial Statements

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to
make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the
reporting period. These estimates include such items as depreciation and allowances for doubtful accounts. Actual results could differ from those estimates.



|3. | Real Estate
|-- | -----------

Real estate consisted of the following
at December 31 (in thousands):



|                                  |  |      |            |   |      |   |            |  
|--------------------------------- |  | ---- | ---------- | - | ---- | - | ---------- | -
|                                  |  | 2008 |            |   | 2007 |  
|Land                              |  | $    | 1,867,429  |   |      | $ | 1,742,872  |  
|Land held for future development  |  |      | 224,395    |   |      |   | 246,094    |  
|Real estate held for sale, net    |  |      |           |   |      |   | 221,606    |  
|Buildings and improvements        |  |      | 6,371,135  |   |      |   | 6,129,138  |  
|Tenant improvements               |  |      | 862,315    |   |      |   | 770,444    |  
|Furniture, fixtures and equipment |  |      | 22,929     |   |      |   | 20,474     |  
|Development in process            |  |      | 829,995    |   |      |   | 700,762    |  
|                                  |  |      |            |   |      |   |            |  
|Total                             |  |      | 10,178,198 |   |      |   | 9,831,390  |  
|Less: Accumulated depreciation    |  |      | (1,744,248 | ) |      |   | (1,515,195 | )
|                                  |  |      |            |   |      |   |            |  
|                                  |  | $    | 8,433,950  |   |      | $ | 8,316,195  |  
|                                  |  |      |            |   |      |   |            |  



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



Acquisitions

On September 26, 2008, the Company acquired from National Public Radio (NPR) its headquarters building at 635 Massachusetts Avenue (the NPR Building) comprised of approximately 211,000 net
rentable square feet located in Washington, DC for a purchase price of approximately $119.5 million in cash. In addition, the Company and NPR have entered into a development management agreement pursuant to which the Company will act as development
manager for NPRs new headquarters building on NPR-owned land at 1111 North Capitol Street in Washington, DC. NPR and the Company have entered into a lease for the NPR Building for a five-year term at the conclusion of which NPR will occupy its
new headquarters. Following the expiration of the lease with NPR, the Company expects to redevelop the NPR Building site into a Class A office property comprised of approximately 450,000 net rentable square feet.

Development

On February 5,
2008, the Company executed 60-year ground leases with The George Washington University for the redevelopment of a site at Pennsylvania Avenue and Washington Circle in the District of Columbia as a mixed-use project comprised of
approximately 450,000 square feet of office and retail space and 330,000 square feet of residential space. The Company has commenced construction on the project.

On May 12, 2008, the Company acquired the remaining development rights for its 250 West 55th Street development project located in New York City for
an aggregate purchase price of approximately $34.2 million. The acquisition was financed with approximately $19.2 million of cash and the issuance to the selling entity of 150,000 OP Units.

During the year ended December 31, 2008, the Company commenced construction of the Corporate Center of Weston, a build-to-suit Class A office
project with approximately 356,000 net rentable square feet located in Weston, Massachusetts.

During the year ended December 31,
2008, the Company placed in-service the following development properties:



| |  |  | 505 9th Street, a Class A office project with approximately 323,000 net rentable square feet located in Washington, DC (owned by a consolidated joint venture
in which the Company has a 50% interest);
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | 77 CityPoint, a Class A office project with approximately 210,000 net rentable square feet located in Waltham, Massachusetts;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------



| |  |  | South of Market, comprised of three Class A office properties aggregating approximately 652,000 net rentable square feet located in Reston, Virginia; and
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | One Preserve Parkway, a Class A office project with approximately 183,000 net rentable square feet located in Rockville, Maryland (partially placed
in-service).
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------

Dispositions

On January 7, 2008, the Company transferred at cost Mountain View Research Park and Mountain View Technology Park to its Value-Added Fund for an aggregate of approximately $221.6 million. The Research Park
properties are comprised of sixteen Class A office and office/technical properties aggregating approximately 601,000 net rentable square feet located in Mountain View, California. The Technology Park properties are comprised of seven
office/technical properties aggregating approximately 135,000 net rentable square feet located in Mountain View, California. In consideration for the transfer, the Company received approximately $98.6 million of cash and a promissory note having a
principal amount of $123.0 million. The promissory note bore interest at a fixed rate of 7% per annum and was scheduled to mature in October 2008. On March 27, 2008,



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



the Value-Added Fund repaid $23.0 million of the financing with proceeds from third-party mortgage financing collateralized by the Mountain View Technology
Park properties. On May 30, 2008, the Value-Added Fund repaid the remaining $100.0 million of the financing with proceeds from third-party mortgage financing collateralized by the Mountain View Research Park properties.

On April 14, 2008, the Company sold a parcel of land located in Washington, DC for approximately $33.7 million. The Company had previously entered
into a development management agreement with the buyer to develop a Class A office property on the parcel totaling approximately 165,000 net rentable square feet. Due to the Companys involvement in the construction of the project, the
gain on sale has been deferred and will be recognized over the project construction period generally based on the percentage of total project costs incurred to estimated total project costs. As a result, the Company recognized a gain on sale during
the year ended December 31, 2008 of approximately $9.9 million.

During the year ended December 31, 2008, the Company signed a
new qualifying lease for approximately 17,454 net rentable square feet of its remaining 25,409 net rentable square foot master lease obligation related to the 2006 sale of 280 Park Avenue resulting in the recognition of approximately $23.4 million
as additional gain on sale of real estate. The Company had deferred approximately $67.3 million of the gain on sale of 280 Park Avenue, which amount represented the maximum obligation under the master lease. As of December 31, 2008, the
remaining master lease obligation totaled approximately $0.9 million.



|4. | Deferred Charges
|-- | ----------------

Deferred charges consisted of the
following at December 31, (in thousands):



|                               |  |      |          |   |      |   |          |  
|------------------------------ |  | ---- | -------- | - | ---- | - | -------- | -
|                               |  | 2008 |          |   | 2007 |  
|Leasing costs                  |  | $    | 416,299  |   |      | $ | 375,004  |  
|Financing costs                |  |      | 68,626   |   |      |   | 55,580   |  
|                               |  |      |          |   |      |   |          |  
|                               |  |      | 484,925  |   |      |   | 430,584  |  
|Less: Accumulated amortization |  |      | (158,524 | ) |      |   | (143,385 | )
|                               |  |      |          |   |      |   |          |  
|                               |  | $    | 326,401  |   |      | $ | 287,199  |  
|                               |  |      |          |   |      |   |          |  



|5. | Investments in Unconsolidated Joint Ventures
|-- | --------------------------------------------

The
investments in unconsolidated joint ventures consists of the following at December 31, 2008:



|                                                |  |                                                                                               |  |                    |        
|----------------------------------------------- |  | --------------------------------------------------------------------------------------------- |  | ------------------ | -------
|Entity                                          |  | Properties                                                                                    |  | Nominal %Ownership |        
|Square 407 Limited Partnership                  |  | Market Square North                                                                           |  | 50.0               | %      
|The Metropolitan Square Associates LLC          |  | Metropolitan Square                                                                           |  | 51.0               | %(1)   
|BP/CRF 901 New York Avenue LLC                  |  | 901 New York Avenue                                                                           |  | 25.0               | %(2)   
|WP Project Developer LLC                        |  | Wisconsin Place Land and Infrastructure                                                       |  | 23.9               | %(3)(4)
|Wisconsin Place Retail LLC                      |  | Wisconsin Place Retail                                                                        |  | 5.0                | %(3)   
|Eighth Avenue and 46th Street Entities          |  | Eighth Avenue and 46thStreet                                                                  |  | 50.0               | %(3)   
|Boston Properties Office Value-Added Fund, L.P. |  | 300 Billerica Road, One & Two Circle Star Way and Mountain View Research and Technology Parks |  | 36.9               | %(2)(5)
|Annapolis Junction NFM, LLC                     |  | Annapolis Junction                                                                            |  | 50.0               | %(3)   
|767 Venture, LLC                                |  | The General Motors Building                                                                   |  | 60.0               | %(1)   
|2 GCT Venture, LLC                              |  | Two Grand Central Tower                                                                       |  | 60.0               | %(1)   
|540 Madison Venture, LLC                        |  | 540 Madison Avenue                                                                            |  | 60.0               | %(1)   
|125 West 55th Street Venture, LLC               |  | 125 West 55thStreet                                                                           |  | 60.0               | %(1)   



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)





|(1) | The Company has determined that these entities are not VIEs and that its joint venture partners have substantive participating rights with respect to the assets and operations of
the properties, pursuant to the joint venture agreements.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(2) | The Companys economic ownership can increase based on the achievement of certain return thresholds.
|--- | ----------------------------------------------------------------------------------------------------

|(3) | These properties have been partially placed in-service or are not in operation (i.e., under construction or assembled land).
|--- | ----------------------------------------------------------------------------------------------------------------------------

|(4) | Represents the Companys effective ownership interest. The Company has a 66.67%, 5% and 0% interest in the office, retail and residential joint venture entities, respectively,
each of which owns a 33.33% interest in the entity developing and owning the land and infrastructure of the project.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(5) | Represents the Companys effective ownership interest. The Company has a 25.0% interest in the 300 Billerica Road and One & Two Circle Star Way properties and a 39.5%
interest in the Mountain View Research and Technology Park properties.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Certain of the Companys joint venture
agreements include provisions whereby, at certain specified times, each partner has the right to initiate a purchase or sale of its interest in the joint ventures at an agreed upon fair value. Under these provisions, the Company is not compelled to
purchase the interest of its outside joint venture partners.

On January 7, 2008, the Company transferred at cost Mountain View
Research Park and Mountain View Technology Park to its Value-Added Fund for an aggregate of approximately $221.6 million. The Research Park properties are comprised of sixteen Class A office and office/technical properties aggregating
approximately 601,000 net rentable square feet located in Mountain View, California. The Technology Park properties are comprised of seven office/technical properties aggregating approximately 135,000 net rentable square feet located in Mountain
View, California. In consideration for the transfer, the Company received approximately $98.6 million of cash and a promissory note having a principal amount of $123.0 million. The promissory note bore interest at a fixed rate of 7% per annum
and was scheduled to mature in October 2008. In connection with the transfer of the Research Park and Technology Park properties to the Value-Added Fund, the Company and its partners agreed to certain modifications to the Value-Added Funds
original terms, including bifurcating the Value-Added Funds promote structure such that Research Park and Technology Park will be accounted for separately from the non-Mountain View properties owned by the Value-Added Fund (i.e., Circle Star
and 300 Billerica Road). As a result of the modifications, the Companys interest in the Mountain View properties is approximately 39.5% and its interest in the non-Mountain View properties is 25%. This investment completes the investment
commitments for new properties from the Value-Added Fund partners.

On January 29, 2008, the Wisconsin Place joint venture entity that
owns and is developing the land and infrastructure components of the project (the Land and Infrastructure Entity) (a joint venture entity in which the Company owns an effective interest of approximately 23.89%) executed a second
amendment to its construction loan agreement. The construction financing consisted of a $69.1 million commitment, bearing interest at a per annum variable rate equal to LIBOR plus 1.50% and maturing on March 11, 2009. The outstanding balance on
the construction loan was approximately $52.6 million out of the $69.1 million commitment. The amended agreement provides for a reduction in the loan commitment amount to $36.9 million. The reduction relates to the repayment of the office portion of
the outstanding balance totaling approximately $24.9 million and an additional reduction in the borrowing capacity of approximately $7.3 million with a corresponding release of collateral in conjunction with the Wisconsin Place joint venture entity
that owns and is developing the office component of the project (a consolidated joint venture entity in which the Company owns a 66.67% interest) obtaining new construction financing for its project. On April 29, 2008, the Land and
Infrastructure Entity repaid the balance of the construction loan totaling approximately $29.4 million. The repayment relates to the repayment of the residential portion of the outstanding balance in conjunction with the



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Wisconsin Place joint venture entity that owns and is developing the residential component of the project (a joint venture entity in which the Company does
not own an interest) obtaining new construction financing for its project.

On March 27, 2008, the Value-Added Fund obtained
third-party mortgage financing totaling $26.0 million (of which $24.0 million was drawn at closing and approximately $38,000 was drawn to fund tenant and capital costs, with the remaining amount available to fund future tenant and capital costs)
collateralized by the Mountain View Technology Park properties. The third-party mortgage financing bears interest at a variable rate equal to LIBOR plus 1.50% per annum and matures on March 31, 2011 with two, one-year extension options.
The proceeds of the third-party mortgage financing were used to repay $23.0 million of the financing provided by the Company. On June 12, 2008, the Value-Added Fund entered into an interest rate swap contract related to the mortgage loan
collateralized by the Mountain View Technology Park properties with a notional amount of $24.0 million to fix the one-month LIBOR index rate at 4.085% per annum through maturity on March 31, 2011.

On May 30, 2008, the Companys Value-Added Fund obtained mortgage financing totaling $120.0 million (of which $103.0 million was drawn at
closing, $3.3 million was drawn to fund tenant and capital costs, with the remaining $13.7 million available to fund future tenant and capital costs) collateralized by the Mountain View Research Park properties. The mortgage financing bears interest
at a variable rate equal to LIBOR plus 1.75% per annum and matures on May 31, 2011 with two, one-year extension options. The Value-Added Fund entered into three interest rate swap contracts with notional amounts aggregating $103.0 million
to fix the one-month LIBOR index rate at 3.63% per annum through April 1, 2011. The proceeds of the mortgage financing were used to repay the remaining $100.0 million of financing provided by the Company.

On June 9, 2008, the Company completed the acquisition of the General Motors Building in New York City for a purchase price of approximately $2.8
billion. The General Motors Building is an approximately 1,770,000 net rentable square foot office building located at the corner of 5th Avenue and Central Park South in New York City. The acquisition was completed through a joint venture among the
Company, US Real Estate Opportunities I, L.P., which is a partnership managed by Goldman Sachs, and Meraas Capital LLC, a Dubai-based private equity firm. The Company has a 60% interest in the venture and provides customary property management and
leasing services for the venture. The purchase price consisted of approximately $890 million of cash, the issuance to the selling entity of 102,883 OP Units and the assumption of approximately $1.9 billion of secured and mezzanine loans having a
weighted average fixed interest rate of 5.97% per annum, all of which mature in October 2017. In addition, the venture acquired the lenders interest in a portion of the assumed mezzanine loans having an aggregate principal amount of
$294.0 million and a stated interest rate of 6.02% per annum for a purchase price of approximately $263.1 million in cash. The purchase price was financed in part with loans from the ventures partners on a pro rata basis totaling $450.0
million, which bear interest at a fixed rate of 11.0% per annum and mature on June 9, 2017. The Companys share of the partner loans totaling $270.0 million has been reflected in Related Party Note Receivable on the Companys
Consolidated Balance Sheets. The Company has eliminated interest income from its partner loan totaling approximately $16.9 million. In connection with the loan assumption, the Company has guaranteed the joint ventures obligation to fund
various escrows including tenant improvements, taxes and insurance in lieu of cash deposits. As of December 31, 2008, the maximum funding obligation under the guarantee was approximately $31.2 million. The Company earns a fee from the joint venture
for providing the guarantee and has an agreement with the outside partners to reimburse the joint venture for their share of any payments made under the guarantee. In connection with the closing, the Company and the joint venture entered into a tax
protection agreement with the seller that restricts the joint ventures ability to sell the General Motors Building in a taxable transaction and requires the Company and the joint venture to maintain certain amounts of
indebtedness associated with the property and its acquisition for a period of up to nine years.



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



The following table summarizes the allocation of the purchase price, in accordance with SFAS
No. 141, for the General Motors Building at the date of acquisition (in thousands).



|                                     |  |   |            |  
|------------------------------------ |  | - | ---------- | -
|Land                                 |  | $ | 1,139,394  |  
|Building and improvements            |  |   | 1,957,257  |  
|Tenant improvements                  |  |   | 76,384     |  
|Tenant leasing costs                 |  |   | 574,004    |  
|Below market assumed debt adjustment |  |   | 101,395    |  
|Below market rents                   |  |   | (1,057,256 | )
|                                     |  |   |            |  
|Total aggregate purchase price       |  | $ | 2,791,178  |  
|Less: Indebtedness assumed, net      |  |   | (1,606,000 | )
|                                     |  |   |            |  
|Net assets acquired                  |  | $ | 1,185,178  |  
|                                     |  |   |            |  

On August 12, 2008, the Company completed the acquisitions of 540 Madison Avenue and Two
Grand Central Tower located in New York City, New York for an aggregate purchase price of approximately $705.0 million. 540 Madison Avenue is a 39-story building located at Madison Avenue at 55th Street that contains approximately 292,000 rentable
square feet. Two Grand Central Tower is a 44-story mid-block tower that runs from 44th to 45th Street between Lexington and Third Avenue and contains approximately 664,000 rentable square feet. On August 13, 2008, the Company completed the
acquisition of 125 West 55th Street also located in New York City, New York for a purchase price of approximately $444.0 million. 125 West 55th Street is a 23-story building, spanning from 55th to 56th Street between Avenue of the Americas and
Seventh Avenue, that contains approximately 591,000 rentable square feet. Each acquisition was completed through a joint venture among the Company, US Real Estate Opportunities I, L.P. and Meraas Capital LLC. The Company has a 60% interest in each
venture and provides customary property management and leasing services for the ventures. The acquisitions were financed with cash contributions from the ventures partners aggregating approximately $575.6 million and the assumption of
approximately $573.4 million of secured and mezzanine loans. The carrying value of the debt that was assumed as part of the transactions consists of the following:



| |  |  | 540 Madison Avenuetwo secured loans having an aggregate principal amount of $119.9 million and a weighted-average fixed interest rate of 5.20% per annum,
each of which matures in July 2013;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Two Grand Central Towera $190.0 million secured loan having a fixed interest rate of 5.10% per annum, which matures in July 2010; and
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------



| |  |  | 125 West 55th Street$263.5 million of secured and mezzanine loans having a weighted-average fixed interest rate of 6.25% per annum, all of which mature
in March 2010.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------

The following table summarizes the allocation of the aggregate purchase prices, in accordance with SFAS
No. 141, for 540 Madison Avenue, Two Grand Central Tower and 125 West 55th Street, at the date of acquisition (in thousands).



|                                     |  |   |           |  
|------------------------------------ |  | - | --------- | -
|Land                                 |  | $ | 375,273   |  
|Building and improvements            |  |   | 760,431   |  
|Tenant improvements                  |  |   | 24,242    |  
|Tenant leasing costs                 |  |   | 88,940    |  
|Below market assumed debt adjustment |  |   | 14,419    |  
|Below market rents                   |  |   | (107,395  | )
|                                     |  |   |           |  
|Total aggregate purchase price       |  | $ | 1,155,910 |  
|Less: Indebtedness assumed, net      |  |   | (573,433  | )
|                                     |  |   |           |  
|Net assets acquired                  |  | $ | 582,477   |  
|                                     |  |   |           |  



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



On October 8, 2008, a joint venture in which the Company has a 50% interest placed in-service
Annapolis Junction, a 118,000 net rentable square foot Class A office property located in Annapolis, Maryland.

During December 2008,
the Company recognized impairment charges which represented the other-than-temporary decline in the fair values below the carrying values of certain of the Companys investments in unconsolidated joint ventures. In accordance with Accounting
Principles Board Opinion No. 18 The Equity Method of Accounting for Investments in Common Stock (APB No. 18), a loss in value of an investment under the equity method of accounting, which is other than a temporary decline, must
be recognized. Unlike SFAS No. 144, potential impairments under APB No. 18 result from fair values derived based on discounted cash flows and other valuation techniques which are more sensitive to current market conditions. As a result, the Company
recognized non-cash impairment charges of approximately $31.9 million, $74.3 million, $45.1 million and $13.8 million on its investments in 540 Madison Avenue, Two Grand Central Tower, 125 West 55th Street and the Companys Value-Added Fund,
respectively.

During December 2008, the unconsolidated joint venture in which the Company has a 50% interest suspended development
activity on its Eighth Avenue and 46th Street project located in New York City. The proposed project was comprised of an assemblage of land parcels and air-rights, including contracts to acquire land parcels and air-rights, on which the joint
venture was to construct a Class A office property. As a result, the Company recognized a charge totaling approximately $23.2 million (including approximately $2.9 million of non-cash impairment charges in accordance with APB No. 18),
which represented the Companys share of land and air-rights impairment losses, forfeited contract deposits and previously incurred planning and pre-development costs.

The combined summarized financial information of the unconsolidated joint ventures is as follows (in thousands):



|                                                                             |  |              |           |   |      |   |        
|---------------------------------------------------------------------------- |  | ------------ | --------- | - | ---- | - | -------
|                                                                             |  | December 31,
|Balance Sheets                                                               |  | 2008         |           |   | 2007
|Real estate and development in process, net                                  |  | $            | 5,235,149 |   |      | $ | 700,646
|Other assets                                                                 |  |              | 824,232   |   |      |   | 109,318
|                                                                             |  |              |           |   |      |   |        
|Total assets                                                                 |  | $            | 6,059,381 |   |      | $ | 809,964
|                                                                             |  |              |           |   |      |   |        
|Mortgage and Notes payable                                                   |  | $            | 3,189,549 |   |      | $ | 565,568
|Other liabilities                                                            |  |              | 1,215,849 |   |      |   | 39,290 
|Members/Partners equity                                                    |  |              | 1,653,983 |   |      |   | 205,106
|                                                                             |  |              |           |   |      |   |        
|Total liabilities and members/partners equity                              |  | $            | 6,059,381 |   |      | $ | 809,964
|                                                                             |  |              |           |   |      |   |        
|Companys share of equity                                                    |  | $            | 948,222   |   |      | $ | 79,074 
|Basis differential(1)                                                        |  |              | (165,462  | ) |      |   | 2,598  
|                                                                             |  |              |           |   |      |   |        
|Carrying value of the Companys investments in unconsolidated joint ventures |  | $            | 782,760   |   |      | $ | 81,672 
|                                                                             |  |              |           |   |      |   |        



|(1) | This amount represents the aggregate difference between the Companys historical cost basis and the basis reflected at the joint venture level, which is typically amortized
over the life of the related asset. Basis differentials occur from impairment of investments and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other
costs may not be reflected in the net assets at the joint venture level.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



|                                                               |  |                         |          |   |      |   |        |  |   |        
|-------------------------------------------------------------- |  | ----------------------- | -------- | - | ---- | - | ------ |  | - | -------
|Statements of Operations                                       |  | Year Ended December 31,
|                                                               |  | 2008                    |          |   | 2007 |   | 2006  
|                                                               |  | (in thousands)         
|Total revenue (1)                                              |  | $                       | 363,168  |   |      | $ | 95,064 |  | $ | 103,050
|Expenses                                                       |  |                         |          |   |      |   |        |  |   |        
|Operating                                                      |  |                         | 101,670  |   |      |   | 35,546 |  |   | 33,595 
|Interest                                                       |  |                         | 139,154  |   |      |   | 31,883 |  |   | 34,899 
|Depreciation and amortization                                  |  |                         | 144,712  |   |      |   | 21,386 |  |   | 23,959 
|Impairment loss                                                |  |                         | 40,570   |   |      |   |       |  |   |       
|Loss from early extinguishment of debt                         |  |                         | 152      |   |      |   | 146    |  |   | 205    
|                                                               |  |                         |          |   |      |   |        |  |   |        
|Total expenses                                                 |  |                         | 426,258  |   |      |   | 88,961 |  |   | 92,658 
|                                                               |  |                         |          |   |      |   |        |  |   |        
|Income (loss) before gain on sale of real estate               |  |                         | (63,090  | ) |      |   | 6,103  |  |   | 10,392 
|Gain on sale of real estate                                    |  |                         |         |   |      |   | 32,777 |  |   | 51,384 
|                                                               |  |                         |          |   |      |   |        |  |   |        
|Net income (loss)                                              |  | $                       | (63,090  | ) |      | $ | 38,880 |  | $ | 61,776 
|                                                               |  |                         |          |   |      |   |        |  |   |        
|Companys share of net income (loss)                           |  | $                       | (30,910  | ) |      | $ | 20,428 |  | $ | 24,507 
|Impairment loss on investments                                 |  |                         | (168,040 | ) |      |   |       |  |   |       
|Elimination of inter-entity interest on partner loan           |  |                         | 16,932   |   |      |   |       |  |   |       
|                                                               |  |                         |          |   |      |   |        |  |   |        
|Income (loss) from investment in unconsolidated joint ventures |  | $                       | (182,018 | ) |      | $ | 20,428 |  | $ | 24,507 
|                                                               |  |                         |          |   |      |   |        |  |   |        



|(1) | Includes straight-line rent adjustments of $14.9 million, $2.2 million and $3.2 million for the years ended December 31, 2008, 2007 and 2006, respectively. Includes
above and below market rent adjustments of $91.7 million, $(3.2) million and $(1.4) million for the years ended December 31, 2008, 2007 and 2006, respectively.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|6. | Mortgage Notes Payable
|-- | ----------------------

The Company had outstanding
mortgage notes payable totaling approximately $2.7 billion as of December 31, 2008 and 2007, each collateralized by one or more buildings and related land included in real estate assets. The mortgage notes payable are generally due in monthly
installments and mature at various dates through August 1, 2021.

Fixed rate mortgage notes payable totaled approximately $2.4 billion
and $2.6 billion at December 31, 2008 and 2007, respectively, with contractual interest rates ranging from 5.55% to 8.54% per annum (averaging 6.50% and 6.55% at December 31, 2008 and 2007, respectively).

Variable rate mortgage notes payable (including construction loans payable) totaled approximately $285.5 million and $122.9 million at December 31,
2008 and 2007, respectively, with an interest rate of 1.25% above the London Interbank Offered Rate (LIBOR) at December 31, 2007 and ranging from 1.00% to 1.75% above LIBOR at December 31, 2008. As of December 31, 2008 and
2007, the LIBOR rate was 0.44% and 4.60%, respectively.

On January 29, 2008, the Wisconsin Place joint venture entity that owns and
is developing the office component of the project (a consolidated joint venture entity in which the Company owns a 66.67% interest) obtained construction financing totaling $115.0 million collateralized by the office property. Wisconsin Place is a
mixed-use development project consisting of office, retail and residential properties located in Chevy Chase, Maryland. The construction financing bears interest at a variable rate equal to LIBOR plus 1.25% per annum and matures on
January 29, 2011 with two, one-year extension options.



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



On February 1, 2008, the Company used available cash to repay the mortgage loan collateralized
by its Reston Corporate Center property located in Reston, Virginia totaling approximately $20.5 million. There was no prepayment penalty associated with the repayment. The mortgage loan bore interest at a fixed rate of 6.56% per annum and was
scheduled to mature on May 1, 2008.

On April 1, 2008, the Company used available cash to repay the mortgage loan collateralized
by its Prudential Center property located in Boston, Massachusetts totaling approximately $258.2 million. There was no prepayment penalty associated with the repayment. The mortgage loan bore interest at a fixed rate of 6.72% per annum and was
scheduled to mature on July 1, 2008.

On June 19, 2008, the Company obtained construction financing totaling $65.0 million
collateralized by its Democracy Tower (formerly South of MarketPhase II) development project located in Reston, Virginia. The Democracy Tower development project consists of a Class A office property with approximately 225,000 net
rentable square feet. The construction financing bears interest at a variable rate equal to LIBOR plus 1.75% per annum and matures on December 19, 2010 with two one-year extension options.

On September 10, 2008, the Company used available cash to repay the mortgage loan collateralized by its One and Two Embarcadero Center properties
located in San Francisco, California totaling approximately $274.8 million. There was no prepayment penalty associated with the repayment. The mortgage loan bore interest at a fixed rate of 6.74% per annum and was scheduled to mature on
December 10, 2008.

On October 10, 2008, the Company used available cash to repay the mortgage loan collateralized by its Bedford
Business Park properties located in Bedford, Massachusetts totaling approximately $16.1 million. There was no prepayment penalty associated with the repayment. The mortgage loan bore interest at a fixed rate of 8.60% per annum and was scheduled
to mature on December 10, 2008.

On November 13, 2008, the Company obtained mortgage financing totaling $375.0 million
collateralized by its Four Embarcadero Center property located in San Francisco, California. The mortgage loan bears interest at a fixed rate of 6.10% per annum and matures on December 1, 2016.

During 2007, the Company commenced an interest rate hedging program for its expected financing activity in 2008 and entered into 11 treasury locks based
on a weighted-average 10-year treasury rate of 4.68% per annum on notional amounts aggregating $375.0 million. Nine of the treasury locks with notional amounts aggregating $325.0 million matured on April 1, 2008, at which time the Company
cash-settled the contracts and made cash payments to the counterparties totaling approximately $33.5 million. The remaining two treasury locks with notional amounts aggregating $50.0 million matured on July 31, 2008, at which time the Company
cash-settled the contracts and made cash payments to the counterparties totaling approximately $1.3 million. In addition, the Company entered into five forward-starting interest rate swap contracts to lock the 10-year LIBOR swap rate on notional
amounts aggregating $150.0 million at a weighted-average forward-starting 10-year swap rate of 5.19% per annum. The 10-year treasury rate is a component of the 10-year swap rate and the swap contracts effectively fixed the 10-year treasury rate
at a weighted-average interest rate of 4.51% per annum. The swap contracts went into effect on July 31, 2008 and were to expire on July 31, 2018. On July 31, 2008 and September 2, 2008, the Company cash-settled its
forward-starting interest rate swap contracts and made aggregate cash payments to the counterparties totaling approximately $8.6 million. Collectively, all of the foregoing contracts were intended to have effectively fixed the 10-year treasury rate
at a weighted-average interest rate of 4.63% per annum on notional amounts aggregating $525.0 million. The Company entered into the treasury locks and interest rate swap contracts designated and qualifying as cash flow hedges to reduce its
exposure to the variability in future cash flows attributable to changes in the hedged rate in contemplation of



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



obtaining ten-year fixed-rate financings in 2008. In addition, during 2007, the Company entered into an interest rate swap to fix the one-month LIBOR index
rate at 4.57% per annum on a notional amount of $96.7 million. This interest rate swap went into effect on October 22, 2007 and expired on October 29, 2008.

SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities (SFAS No. 133), as amended and interpreted,
establishes accounting and reporting standards for derivative instruments. The Company has formally documented all of its relationships between hedging instruments and hedged items, as well as its risk-management objective and strategy for
undertaking various hedge transactions. The Company also assesses and documents, both at the hedging instruments inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are highly effective in
offsetting changes in cash flows associated with the hedged items. All components of the treasury locks and forward-starting interest rate swap contracts were included in the assessment of hedge effectiveness. During the year ended December 31,
2008, the Company modified the estimated dates with respect to its anticipated financings under the interest rate hedging program. As a result, during the first through third quarters of 2008, the Company recognized a net derivative loss aggregating
approximately $3.3 million representing the partial ineffectiveness of the interest rate contracts. In addition, on September 9, 2008, the Company executed an interest rate lock agreement with lenders at an all-in fixed rate, inclusive of the
credit spread, of 6.10% per annum for an eight-year, $375.0 million loan collateralized by its Four Embarcadero Center property located in San Francisco, California. The Companys interest rate hedging program contemplated a financing with
a ten-year term and, as a result, under SFAS No. 133, during the third quarter of 2008 the Company recognized a net derivative loss of approximately $6.6 million representing the partial ineffectiveness of its interest rate contracts. The
Company will reclassify into earnings over the eight-year term of the Four Embarcadero Center loan as an increase in interest expense approximately $26.4 million (approximately $3.3 million per year) of the amounts recorded on its consolidated
balance sheet within accumulated other comprehensive loss, which amounts represent the effective portion of the applicable interest rate hedging contracts. The Companys interest rate hedging program also contemplated obtaining additional
financing of at least $150.0 million by the end of 2008. In accordance with SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities, as amended and interpreted, the Company determined that it would be unable to
complete the financing by the required date under its hedging program. As a result, during the fourth quarter of 2008, the Company recognized a net derivative loss of approximately $7.2 million representing the ineffectiveness of its remaining
interest rate hedging contracts.

Seven mortgage loans totaling approximately $350.2 million at December 31, 2008 and approximately
$357.6 million at December 31, 2007 have been accounted for at their fair values on the date the mortgage loans were assumed. The impact of recording the mortgage loans at fair value resulted in a decrease to interest expense of $4.3 million,
$4.2 million and $3.7 million for the years ended December 31, 2008, 2007 and 2006, respectively. The cumulative liability related to the fair value adjustments was $13.2 million and $17.6 million at December 31, 2008 and 2007,
respectively, and is included in mortgage notes payable.

Contractual aggregate principal payments of mortgage notes payable at
December 31, 2008 are as follows:



|           |  |                   |          
|---------- |  | ----------------- | ---------
|           |  | PrincipalPayments
|           |  | (in thousands)   
|2009       |  | $                 | 274,659  
|2010       |  |                   | 161,489  
|2011       |  |                   | 620,808  
|2012       |  |                   | 105,059  
|2013       |  |                   | 100,436  
|Thereafter |  |                   | 1,384,957



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BOSTON PROPERTIES LIMITED PARTNERSHIP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



|7. | Unsecured Senior Notes
|-- | ----------------------

The following summarizes
the unsecured senior notes outstanding as of December 31, 2008 (dollars in thousands):



|                               |  |                    |   |  |                  |   |  |                 |           |   |                 |         
|------------------------------ |  | ------------------ | - |  | ---------------- | - |  | --------------- | --------- | - | --------------- | --------
|                               |  | Coupon/Stated Rate |   |  | EffectiveRate(1) |   |  | PrincipalAmount |           |   | MaturityDate(2)
|10 Year Unsecured Senior Notes |  | 6.250              | % |  | 6.381            | % |  | $               | 750,000   |   |                 | 01/15/13
|10 Year Unsecured Senior Notes |  | 6.250              | % |  | 6.291            | % |  |                 | 175,000   |   |                 | 01/15/13
|12 Year Unsecured Senior Notes |  | 5.625              | % |  | 5.693            | % |  |                 | 300,000   |   |                 | 04/15/15
|12 Year Unsecured Senior Notes |  | 5.000              | % |  | 5.194            | % |  |                 | 250,000   |   |                 | 06/01/15
|                               |  |                    |   |  |                  |   |  |                 |           |   |                 |         
|Total principal                |  |                    |   |  |                  |   |  |                 | 1,475,000 |   |                 |         
|Net discount                   |  |                    |   |  |                  |   |  |                 | (2,625    | ) |                 |         
|                               |  |                    |   |  |                  |   |  |                 |           |   |                 |         
|Total                          |  |                    |   |  |                  |   |  | $               | 1,472,375 |   |                 |         
|                               |  |                    |   |  |                  |   |  |                 |           |   |                 |         



|(1) | Yield on issuance date including the effects of discounts on the notes.
|--- | -----------------------------------------------------------------------

|(2) | No principal amounts are due prior to maturity.
|--- | -----------------------------------------------

The
indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage
ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt. At December 31, 2008 and 2007, the Company was in compliance with each of these financial restrictions and requirements.



|8. | Unsecured Exchangeable Senior Notes
|-- | -----------------------------------

The following
summarizes the unsecured exchangeable senior notes outstanding as of December 31, 2008 (dollars in thousands):



|                                 |  |                    |   |  |                  |   |  |              |     |  |                 |           |   |                                         |                   |               |                  
|-------------------------------- |  | ------------------ | - |  | ---------------- | - |  | ------------ | --- |  | --------------- | --------- | - | --------------------------------------- | ----------------- | ------------- | -----------------
|                                 |  | Coupon/Stated Rate |   |  | EffectiveRate(1) |   |  | ExchangeRate |     |  | PrincipalAmount |           |   | First OptionalRedemption Date byCompany |                   | Maturity Date
|3.625% Exchangeable Senior Notes |  | 3.625              | % |  | 4.037            | % |  | 8.5051       | (2) |  | $               | 747,500   |   |                                         | N/A               |               | February 15, 2014
|2.875% Exchangeable Senior Notes |  | 2.875              | % |  | 3.462            | % |  | 7.0430       | (3) |  |                 | 862,500   |   |                                         | February 20, 2012 |               | February 15, 2037
|3.750% Exchangeable Senior Notes |  | 3.750              | % |  | 3.787            | % |  | 10.0066      | (4) |  |                 | 450,000   |   |                                         | May 18, 2013      |               | May 15, 2036     
|                                 |  |                    |   |  |                  |   |  |              |     |  |                 |           |   |                                         |                   |               |                  
|Total principal                  |  |                    |   |  |                  |   |  |              |     |  |                 | 2,060,000 |   |                                         |                   |               |                  
|Net discount                     |  |                    |   |  |                  |   |  |              |     |  |                 | (21,101   | ) |                                         |                   |               |                  
|                                 |  |                    |   |  |                  |   |  |              |     |  |                 |           |   |                                         |                   |               |                  
|Total                            |  |                    |   |  |                  |   |  |              |     |  | $               | 2,038,899 |   |                                         |                   |               |                  
|                                 |  |                    |   |  |                  |   |  |              |     |  |                 |           |   |                                         |                   |               |                  



|(1) | Yield on issuance date including the effects of discounts on the notes.
|--- | -----------------------------------------------------------------------

|(2) | The initial exchange rate is 8.5051 shares per $1,000 principal amount of the notes (or an initial exchange price of approximately $117.58 per share of Boston
Properties, Inc.s common stock). In addition, the Company entered into capped call transactions with affiliates of certain of the initial purchasers, which are intended to reduce the potential dilution upon future exchange of the notes. The
capped call transactions are expected to have the effect of increasing the effective exchange price to the Company of the notes from
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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| | $117.58 to approximately $137.17 per share, representing an overall effective premium of approximately 40% over the closing price on August 13, 2008 of
$97.98 per share of Boston Properties, Inc.s common stock. The net cost of the capped call transactions was approximately $44.4 million.
| | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | In connection with the special dividend of $5.98 per share of common stock declared on December 17, 2007, the exchange rate was adjusted from 6.6090 to 7.0430 shares per $1,000
principal amount of notes effective as of December 31, 2007, resulting in an exchange price of approximately $141.98 per share of Boston Properties, Inc.s common stock.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(4) | In connection with the special dividend of $5.98 per share of common stock declared on December 17, 2007, the exchange rate was adjusted from 9.3900 to 10.0066 shares per
$1,000 principal amount of notes effective as of December 31, 2007, resulting in an exchange price of approximately $99.93 per share of Boston Properties, Inc.s common stock.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

3.625% Exchangeable Senior Notes due 2014

On August 19, 2008, the Company completed an offering of $747.5 million in aggregate principal amount (including $97.5 million as a result of the exercise by the initial purchasers of their over-allotment option) of its 3.625%
exchangeable senior notes due 2014. The notes were priced at 99.0% of their face amount, resulting in aggregate net proceeds to the Company, after deducting the initial purchasers discounts and offering expenses, of approximately $731.6
million, resulting in an effective interest rate of approximately 4.037% per annum. The notes mature on February 15, 2014, unless earlier repurchased, exchanged or redeemed.

On and after January 1, 2014, the notes will be exchangeable at any time prior to the close of business on the second scheduled trading day
immediately preceding the maturity date at the option of the holders into cash up to their principal amount and, at the Companys option, cash or shares of Boston Properties, Inc.s common stock for the remainder, if any, of the exchange
value in excess of such principal amount at the applicable exchange rate, which initially equals 8.5051 shares of Boston Properties, Inc.s common stock per $1,000 principal amount of the notes (equivalent to an exchange price of approximately
$117.58 per share of Boston Properties, Inc.s common stock) and is subject to adjustment in certain circumstances. The initial exchange price of approximately $117.58 per share of Boston Properties, Inc.s common stock represents an
approximately 20% premium to the closing price of Boston Properties, Inc.s common stock on the New York Stock Exchange on August 13, 2008 of $97.98 per share. Prior to the close of business on the scheduled trading day immediately
preceding January 1, 2014, holders of the notes may only exchange their notes at their option under the following circumstances: (1) during the five business day period after any 10 consecutive trading day period (the measurement
period) in which the trading price per $1,000 principal amount of notes for each trading day of that measurement period was less than 98% of the product of the last reported sale price of Boston Properties, Inc.s common stock and the
exchange rate on each such day; (2) during any fiscal quarter beginning after the fiscal quarter ended September 30, 2008 if the last reported sale price of Boston Properties, Inc.s common stock for each of at least 20 trading days
in the 30 consecutive trading days ending on, and including, the last day of the preceding fiscal quarter is more than 130% of the applicable exchange price for the notes on the last day of such preceding fiscal quarter; (3) if the Company has
called such notes for redemption to preserve Boston Properties, Inc.s status as a real estate investment trust and the redemption has not yet occurred; (4) in connection with specified corporate transactions, including a fundamental
change; or (5) if Boston Properties, Inc.s common stock is delisted. The notes may be accelerated upon an event of default as described in Supplemental Indenture No. 7.

If the Company undergoes a fundamental change, holders of the notes will have the option to require the Company to purchase all or any portion of the
notes at a purchase price equal to 100% of the principal amount of the notes to be purchased plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date. The Company will pay cash for all notes so repurchased. The
holders of the notes will have the right to exchange their notes at their option in connection with a fundamental change, and, if a fundamental



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change occurs, the exchange rate may be increased by up to 1.7011 shares of Boston Properties, Inc.s common stock per $1,000 principal amount of the
notes, subject to adjustment in certain circumstances, for a holder who elects to exchange its notes in connection with the fundamental change. The number of additional shares by which the exchange rate will be increased will be determined by
reference to a table included in Supplemental Indenture No. 7, based on the date on which the fundamental change occurs or becomes effective and the price paid per share of Boston Properties, Inc.s common stock in the transaction or event
that constitutes such fundamental change. A fundamental change will be deemed to occur upon the consummation of any transaction or event (whether by means of an exchange offer, liquidation, tender offer, consolidation, merger,
combination, reclassification, recapitalization or otherwise) in connection with which more than 50% of Boston Properties, Inc.s common stock is exchanged for, converted into, acquired for or constitutes solely the right to receive,
consideration which is not at least 90% common stock (or American Depositary Shares representing shares of common stock) that is either (1) listed on, or immediately after consummation of such transaction or event will be listed on, a United
States national securities exchange; or (2) approved, or immediately after the transaction or event will be approved, for listing or quotation on any United States system of automated dissemination of quotations of securities prices similar to
a United States national securities exchange.

The notes are senior unsecured obligations of the Company and rank equally in right of
payment to all existing and future senior unsecured indebtedness and senior in right of payment to any future subordinated indebtedness of the Company. The notes effectively rank junior in right of payment to all existing and future secured
indebtedness of the Operating Company to the extent of the value of the collateral securing such indebtedness. The notes are structurally subordinated to all liabilities of the subsidiaries of the Company.

The Company offered and sold the notes to the initial purchasers in reliance on the exemption from registration provided by Section 4(2) of the
Securities Act of 1933. The initial purchasers then sold the notes to qualified institutional buyers pursuant to the exemption from registration provided by Rule 144A under the Securities Act. The Company relied on these exemptions from registration
based in part on representations made by the initial purchasers.

In connection with the closing, the Company and Boston Properties, Inc.
entered into a Registration Rights Agreement (the Registration Rights Agreement) with the initial purchasers. Under the Registration Rights Agreement, the Company and Boston Properties, Inc. have agreed, for the benefit of the holders of
the notes, to register the resale of Boston Properties, Inc.s common stock, if any, issued upon exchange of the notes on a shelf registration statement filed with the Securities and Exchange Commission. The Company and Boston Properties, Inc.
may be required to pay liquidated damages of up to 0.50% per annum of additional interest to the holders of the notes if the Company and Boston Properties, Inc. fail to meet certain deadlines or take certain actions relating to the registration
of Boston Properties, Inc.s common stock issuable upon exchange of the notes. Neither the Company nor Boston Properties, Inc. will be required to pay liquidated damages with respect to any note after it has been exchanged. Additionally,
pursuant to Supplemental Indenture No. 7, to the extent that any shares of Boston Properties, Inc.s common stock issued upon exchange of the notes are not covered by a resale registration statement that is effective on the date of the
exchange and certain other conditions have been met, the Company must deliver 0.03 additional shares of Boston Properties, Inc.s common stock upon exchange of the notes for each of such shares.

In connection with the sale of the notes, Boston Properties, Inc. and the Company also entered into capped call transactions (together, the Capped
Call Transaction) with affiliates of certain of the initial purchasers (Bank of America, N.A., Deutsche Bank AG, JPMorgan and Morgan Stanley) (the Option Counterparties). Pursuant to the Capped Call Transaction, the Company will
have the right to cause the Option Counterparties to deliver shares of Boston Properties, Inc.s common stock to the Company upon exchange of the notes if the value per share of Boston Properties, Inc.s common stock, as measured under the
terms of the Capped Call



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Transaction, at the time of settlement exceeds an initial strike price of approximately $117.58 per share, subject to certain adjustments similar to those
contained in the notes. The Capped Call Transaction is intended to reduce the potential dilution upon future exchange of the notes in the event that the market value per share of Boston Properties, Inc.s common stock, as measured under the
terms of the Capped Call Transaction, at the time of settlement is greater than the strike price of the Capped Call Transaction. If the market value per share of Boston Properties, Inc.s common stock, as measured under the terms of the Capped
Call Transaction, at the time of settlement exceeds the cap price of the Capped Call Transaction (which is initially equal to approximately $137.17 per share), the dilution mitigation will be limited and there would be dilution to the extent that
the market value per share of Boston Properties, Inc.s common stock exceeds the cap price. The Capped Call Transaction is expected to have the effect of increasing the effective exchange price to the Company of the notes to the cap price of
the Capped Call Transaction, which represents an initial effective premium of approximately 40% over the closing price of Boston Properties, Inc.s common stock on the New York Stock Exchange on August 13, 2008 of $97.98 per share. The
Capped Call Transaction comprises separate contracts entered into by Boston Properties, Inc. and the Company with the Option Counterparties and is not part of the terms of the notes and will not affect the holders rights under the notes. The
net cost of the Capped Call Transaction was approximately $44.4 million, which was recorded as a reduction to Partners Capital.



|9. | Unsecured Line of Credit
|-- | ------------------------

On June 6, 2008, the
Company utilized an accordion feature under its unsecured revolving credit facility (the Unsecured Line of Credit) with a consortium of lenders to increase the current lenders total commitment under the Unsecured Line of Credit
from $605.0 million to $923.3 million. On July 21, 2008, the Company further increased the total commitment from $923.3 million to $1.0 billion. All other material terms under the facility remain unchanged. The Companys Unsecured Line of
Credit bears interest at a variable interest rate equal to Eurodollar plus 0.475% per annum and matures on August 3, 2010, with a provision for a one-year extension at the option of the Company, subject to certain conditions. The Unsecured
Line of Credit is a recourse obligation of the Company. Under the Unsecured Line of Credit, a facility fee equal to 0.125% per annum is payable in quarterly installments. The interest rate and facility fee are subject to adjustment in the event
of a change in the Companys unsecured debt ratings. The Unsecured Line of Credit involves a syndicate of lenders. The Unsecured Line of Credit contains a competitive bid option that allows banks that are part of the lender consortium to bid to
make loan advances to the Company at a negotiated LIBOR-based rate. The Company had an outstanding balance on the Unsecured Line of Credit of $100.0 million at December 31, 2008. The weighted-average balance outstanding was approximately $132.8
million and $30.1 million during the years ended December 31, 2008 and 2007, respectively. The weighted-average interest rate on amounts outstanding was approximately 3.58% and 5.64% during the year ended December 31, 2008 and 2007,
respectively.

The terms of the Unsecured Line of Credit require that the Company maintain a number of customary financial and other
covenants on an ongoing basis, including: (1) a leverage ratio not to exceed 60%, however, the leverage ratio may increase to no greater than 65% provided that it is reduced back to 60% within 180 days, (2) a secured debt
leverage ratio not to exceed 55%, (3) a fixed charge coverage ratio of at least 1.40, (4) an unsecured debt leverage ratio not to exceed 60%, however, the unsecured debt leverage ratio may increase to no greater than 65% provided that
it is reduced back to 60% within 180 days, (5) a minimum net worth requirement, (6) an unsecured debt interest coverage ratio of at least 1.75 and (7) limitations on permitted investments, development, partially owned entities,
business outside of commercial real estate and commercial non-office properties. At December 31, 2008 and 2007, the Company was in compliance with each of these financial and other covenant requirements.



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|10. | Commitments and Contingencies
|--- | -----------------------------

General

In the normal course of business, the Company guarantees its performance of services or indemnifies third parties against its
negligence.

The Company has letter of credit and performance obligations of approximately $22.3 million related to lender and development
requirements.

Certain of the Companys joint venture agreements include provisions whereby, at certain specified times, each partner
has the right to initiate a purchase or sale of its interest in the joint ventures. Under these provisions, the Company is not compelled to purchase the interest of its outside joint venture partners.

Concentrations of Credit Risk

Management of the Company performs ongoing credit evaluations of tenants and may require tenants to provide some form of credit support such as corporate guarantees and/or other financial guarantees. Although the Companys properties
are geographically diverse and the tenants operate in a variety of industries, to the extent the Company has a significant concentration of rental revenue from any single tenant, the inability of that tenant to make its lease payments could have an
adverse effect on the Company.

Some potential losses are not covered by insurance.

The Company carries insurance coverage on its properties of types and in amounts and with deductibles that it believes are in line with coverage
customarily obtained by owners of similar properties. In response to the uncertainty in the insurance market following the terrorist attacks of September 11, 2001, the Federal Terrorism Risk Insurance Act (as amended, TRIA) was
enacted in November 2002 to require regulated insurers to make available coverage for certified acts of terrorism (as defined by the statute). The expiration date of TRIA was extended to December 31, 2014 by the Terrorism Risk
Insurance Program Reauthorization Act of 2007 (TRIPRA). Currently, the Companys property insurance program per occurrence limits are $1.0 billion for its portfolio insurance program, including coverage for acts of terrorism
certified under TRIA. The Company currently insures certain properties, including the General Motors Building located at 767 Fifth Avenue in New York, New York (767 Fifth Avenue), in separate stand alone insurance programs. The property
insurance program per occurrence limits for 767 Fifth Avenue are $1.625 billion, including coverage for acts of terrorism certified under TRIA, with $1.375 billion of coverage for losses in excess of $250 million being provided by NYXP, LLC, as a
direct insurer. The Company also currently carry nuclear, biological, chemical and radiological terrorism insurance coverage (NBCR Coverage) for acts of terrorism certified under TRIA, which is provided by IXP, LLC as a direct insurer,
for the properties in our portfolio, including 767 Fifth Avenue, but excluding the properties owned by the Companys Value-Added Fund and certain other properties owned in joint ventures with third parties or which we manage. The per occurrence
limit for NBCR Coverage is $1.0 billion. Under TRIA, after the payment of the required deductible and coinsurance, the NBCR Coverage is backstopped by the Federal Government if the aggregate industry insured losses resulting from a certified act of
terrorism exceed a program trigger. The program trigger is $100 million and the coinsurance is 15%. Under TRIPRA, if the Federal Government pays out for a loss under TRIA, it is mandatory that the Federal Government recoup the full
amount of the loss from insurers offering TRIA coverage after the payment of the loss pursuant to a formula in TRIPRA. The Company may elect to terminate the NBCR Coverage if the Federal Government seeks recoupment for losses paid under TRIA, if
there is a change in its portfolio or for any other reason. The Company intends to continue to monitor the scope, nature and cost of available terrorism insurance and maintain insurance in amounts and on terms that are commercially reasonable.



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The Company also currently carries earthquake insurance on its properties located in areas known to
be subject to earthquakes in an amount and subject to self-insurance that the Company believes are commercially reasonable. In addition, this insurance is subject to a deductible in the amount of 5% of the value of the affected property.
Specifically, the Company currently carries earthquake insurance which covers its San Francisco region with a $120 million per occurrence limit and a $120 million annual aggregate limit, $20 million of which is provided by IXP, LLC, as a direct
insurer. The amount of the Companys earthquake insurance coverage may not be sufficient to cover losses from earthquakes. In addition, the amount of earthquake coverage could impact the Companys ability to finance properties subject to
earthquake risk. The Company may discontinue earthquake insurance on some or all of its properties in the future if the premiums exceed the Companys estimation of the value of the coverage.

IXP, LLC (IXP), a captive insurance company which is a wholly-owned subsidiary of the Company, acts as a direct insurer with respect to a
portion of the Companys earthquake insurance coverage for its Greater San Francisco properties and the Companys NBCR Coverage for acts of terrorism certified under TRIA. NYXP, LLC (NYXP), a captive insurance company which is
a wholly-owned subsidiary of the Company, acts as a direct insurer with respect to a portion of the Companys coverage for acts of terrorism certified under TRIA for 767 Fifth Avenue. Currently, NYXP only insures losses which exceed the program
trigger under TRIA and NYXP reinsures with a third-party insurance company any coinsurance payable under TRIA. Insofar as the Company owns IXP and NYXP, it is responsible for their liquidity and capital resources, and the accounts of IXP and NYXP
are part of the Companys consolidated financial statements. In particular, if a loss occurs which is covered by the Companys NBCR Coverage but is less than the applicable program trigger under TRIA, IXP would be responsible for the full
amount of the loss without any backstop by the Federal Government. IXP and NYXP would also be responsible for any recoupment charges by the Federal Government in the event losses are paid out and their insurance policies are maintained after the
payout by the Federal Government. If the Company experiences a loss and IXP or NYXP are required to pay under their insurance policies, the Company would ultimately record the loss to the extent of the required payment. Therefore, insurance coverage
provided by IXP and NYXP should not be considered as the equivalent of third-party insurance, but rather as a modified form of self-insurance.

The mortgages on the Companys properties typically contain requirements concerning the financial ratings of the insurers who provide policies covering the property. The Company provides the lenders on a regular basis with the identity
of the insurance companies in the Companys insurance programs. The ratings of some of the Companys insurers are below the rating requirements in some of the Companys loan agreements and the lenders for these loans could attempt to
claim an event of default has occurred under the loan. The Company believes it could obtain insurance with insurers which satisfy the rating requirements. Additionally, in the future the Companys ability to obtain debt financing secured by
individual properties, or the terms of such financing, may be adversely affected if lenders generally insist on ratings for insurers which are difficult to obtain or which result in a commercially unreasonable premium. There can be no assurance that
a deficiency in the financial ratings of one or more of the Companys insurers will not have a material adverse effect on the Company.

The Company continues to monitor the state of the insurance market in general, and the scope and costs of coverage for acts of terrorism and California earthquake risk in particular, but the Company cannot anticipate what coverage will be
available on commercially reasonable terms in future policy years. There are other types of losses, such as from wars or the presence of mold at the Companys properties, for which the Company cannot obtain insurance at all or at a reasonable
cost. With respect to such losses and losses from acts of terrorism, earthquakes or other catastrophic events, if the Company experiences a loss that is uninsured or that exceeds policy limits, the Company could lose the capital invested in the
damaged properties, as well as the anticipated future revenues from those properties. Depending on the specific circumstances of each affected property, it is



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possible that the Company could be liable for mortgage indebtedness or other obligations related to the property. Any such loss could materially and
adversely affect the Companys business and financial condition and results of operations.

Legal Matters

The Company is subject to various legal proceedings and claims that arise in the ordinary course of business. These matters are generally covered by
insurance. Management believes that the final outcome of such matters will not have a material adverse effect on the financial position, results of operations or liquidity of the Company.

State and Local Tax Matters

Because
the Company is organized as a limited partnership, it is generally not subject to federal income taxes, but is subject to certain state and local taxes. In the normal course of business, certain entities through which the Company owns real estate
either have undergone, or are currently undergoing, tax audits. Although the Company believes that it has substantial arguments in favor of its positions in the ongoing audits, in some instances there is no controlling precedent or interpretive
guidance on the specific point at issue. Collectively, tax deficiency notices received to date from the jurisdictions conducting the ongoing audits have not been material. However, there can be no assurance that future audits will not occur with
increased frequency or that the ultimate result of such audits will not have a material adverse effect on the Companys results of operations.

Environmental Matters

It is the Companys policy to retain independent environmental consultants to conduct or update
Phase I environmental assessments (which generally do not involve invasive techniques such as soil or ground water sampling) and asbestos surveys in connection with the Companys acquisition of properties. These pre-purchase environmental
assessments have not revealed environmental conditions that the Company believes will have a material adverse effect on its business, assets, financial condition, results of operations or liquidity, and the Company is not otherwise aware of
environmental conditions with respect to its properties that the Company believes would have such a material adverse effect. However, from time to time environmental conditions at the Companys properties have required and may in the future
require environmental testing and/or regulatory filings, as well as remedial action.

In February 1999, the Company (through a joint
venture) acquired from Exxon Corporation a property in Massachusetts that was formerly used as a petroleum bulk storage and distribution facility and was known by the state regulatory authority to contain soil and groundwater contamination. The
Company developed an office park on the property. The Company engaged a specially licensed environmental consultant to oversee the management of contaminated soil and groundwater that was disturbed in the course of construction. Under the property
acquisition agreement, Exxon agreed to (1) bear the liability arising from releases or discharges of oil and hazardous substances which occurred at the site prior to the Companys ownership, (2) continue monitoring and/or remediating
such releases and discharges as necessary and appropriate to comply with applicable requirements, and (3) indemnify the Company for certain losses arising from preexisting site conditions. Any indemnity claim may be subject to various defenses,
and there can be no assurance that the amounts paid under the indemnity, if any, would be sufficient to cover the liabilities arising from any such releases and discharges.

Environmental investigations at some of the Companys properties and certain properties owned by affiliates of the Company have identified
groundwater contamination migrating from off-site source properties. In each case the Company engaged a licensed environmental consultant to perform the necessary investigations



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and assessments and to prepare any required submittals to the regulatory authorities. In each case the environmental consultant concluded that the properties
qualify under the regulatory program or the regulatory practice for a status which eliminates certain deadlines for conducting response actions at a site. The Company also believes that these properties qualify for liability relief under certain
statutory provisions or regulatory practices regarding upgradient releases. Although the Company believes that the current or former owners of the upgradient source properties may bear responsibility for some or all of the costs of addressing the
identified groundwater contamination, the Company will take such further response actions (if any) that it deems necessary or advisable. Other than periodic testing at some of these properties, no such additional response actions are anticipated at
this time.

Some of the Companys properties and certain properties owned by the Companys affiliates are located in urban,
industrial and other previously developed areas where fill or current or historical uses of the areas have caused site contamination. Accordingly, it is sometimes necessary to institute special soil and/or groundwater handling procedures and/or
include particular building design features in connection with development, construction and other property operations in order to achieve regulatory closure and/or ensure that contaminated materials are addressed in an appropriate manner. In these
situations it is the Companys practice to investigate the nature and extent of detected contamination and estimate the costs of required response actions and special handling procedures. The Company then uses this information as part of its
decision-making process with respect to the acquisition and/or development of the property. For example, the Company owns a parcel in Massachusetts which was formerly used as a quarry/asphalt batching facility. Pre-purchase testing indicated that
the site contained relatively low levels of certain contaminants. We have engaged a specially licensed environmental consultant to monitor environmental conditions at the site and prepare necessary regulatory submittals based on the results of an
environmental risk characterization. A submittal has been made to the regulatory authorities in order to achieve regulatory closure at this site. The submittal included an environmental deed restriction that mandates compliance with certain
protective measures in a portion of the site where low levels of residual soil contamination have been left in place in accordance with applicable laws. Development activities have commenced on the site and this work will be performed in accordance
with the environmental deed restriction and other environmental requirements applicable to the site.

The Company expects that resolution
of the environmental matters relating to the above will not have a material impact on its business, assets, financial condition, results of operations or liquidity. However, the Company cannot assure you that it has identified all environmental
liabilities at its properties, that all necessary remediation actions have been or will be undertaken at the Companys properties or that the Company will be indemnified, in full or at all, in the event that such environmental liabilities
arise.

Tax Protection Obligations

In connection with the acquisition or contribution of six properties, the Company entered into agreements for the benefit of the selling or contributing parties which specifically state that until specified dates
ranging from January 2009 to June 2017, or such time as the contributors do not hold at least a specified percentage of the OP Units owned by such person following the contribution of the properties, the Company will not sell or otherwise transfer
the properties in a taxable transaction. If the Company does sell or transfer the properties in a taxable transaction, it would be liable to the contributors for contractual damages.



|11. | Minority Interests in Property Partnerships
|--- | -------------------------------------------

The
minority interests in property partnerships consist of the outside equity interests in ventures that are consolidated with the financial results of the Company because the Company exercises control over the entities that own the properties. The
equity interests in these ventures that are not owned by the Company, totaling



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BOSTON PROPERTIES LIMITED PARTNERSHIP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



approximately $6.9 million and $25.8 million at December 31, 2008 and December 31, 2007, respectively, are included in Minority Interests in
Property Partnerships on the accompanying Consolidated Balance Sheets.

On February 26, 2007, the Company entered into an agreement to
redeem the outside members equity interest in the limited liability company that owns 250 West 55th Street for an aggregate redemption price of approximately $23.4 million. The Company paid $17.0 million on February 26, 2007, with $3.0
million paid on February 26, 2008 and the balance of approximately $3.4 million payable in monthly installments from March 1, 2007 through August 1, 2009. The redemption was accounted for using the purchase method in accordance with
SFAS No. 141 Business Combinations (SFAS No. 141). The difference between the aggregate book value of the outside members equity interest totaling approximately $10.6 million and the purchase price increased
the recorded value of the propertys net assets.

On May 31, 2007 and June 15, 2007, the Company paid an aggregate of $25.0
million in connection with the agreement entered into in May 2006 to redeem the outside members equity interests in the limited liability company that owns Citigroup Center. The remaining unpaid redemption price, which was paid on
January 5, 2009, is reflected at its fair value in Other Liabilities in the Companys Consolidated Balance Sheets and totaled $25.0 million and $24.4 million at December 31, 2008 and 2007, respectively.



|12. | Redeemable Partnership Units
|--- | ----------------------------

The following table
reflects the activity for redeemable partnership units for the years ended December 31, 2008, 2007 and 2006:



|                                                                        |  |   |           |  
|----------------------------------------------------------------------- |  | - | --------- | -
|Balance at December 31, 2005                                            |  | $ | 1,973,040 |  
|Contributions                                                           |  |   | 10,098    |  
|Net income                                                              |  |   | 186,408   |  
|Distributions                                                           |  |   | (194,277  | )
|Conversion of redeemable partnership units                              |  |   | (87,347   | )
|Unearned compensation                                                   |  |   | (5,119    | )
|Adjustments to reflect redeemable partnership units at redemption value |  |   | 756,996   |  
|                                                                        |  |   |           |  
|Balance at December 31, 2006                                            |  |   | 2,639,799 |  
|Contributions                                                           |  |   | 17,148    |  
|Net income                                                              |  |   | 249,659   |  
|Distributions                                                           |  |   | (192,164  | )
|Conversion of redeemable partnership units                              |  |   | (30,590   | )
|Unearned compensation                                                   |  |   | (7,216    | )
|Adjustments to reflect redeemable partnership units at redemption value |  |   | (619,349  | )
|                                                                        |  |   |           |  
|Balance at December 31, 2007                                            |  |   | 2,057,287 |  
|Contributions                                                           |  |   | 68,209    |  
|Net income                                                              |  |   | 26,836    |  
|Distributions                                                           |  |   | (61,346   | )
|Conversion of redeemable partnership units                              |  |   | (10,906   | )
|Unearned compensation                                                   |  |   | (21,578   | )
|Adjustments to reflect redeemable partnership units at redemption value |  |   | (831,107  | )
|                                                                        |  |   |           |  
|Balance at December 31, 2008                                            |  | $ | 1,227,395 |  
|                                                                        |  |   |           |  



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BOSTON PROPERTIES LIMITED PARTNERSHIP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



Operating Partnership Units

Pursuant to the Companys Partnership Agreement, certain limited partners in the Company have the right to redeem all or any portion of their
interest for cash from the Company. However, Boston Properties, Inc. may elect to acquire the interest by issuing common stock in exchange for their interest. The amount of cash to be paid to the limited partner if the redemption right is exercised
and the cash option is elected is based on the trading price of Boston Properties, Inc.s common stock at that time. Due to the redemption option existing outside the control of the Company, such limited partners units are not included in
Partners Capital. The value of the OP Units (not owned by Boston Properties, Inc. and including LTIP Units assuming that all conditions have been met for the conversion thereof) had such units been redeemed at December 31, 2008 was
approximately $1,147.1 million based on the closing price of Boston Properties, Inc.s common stock of $55.00 per share.

During
the years ended December 31, 2008 and 2007, 631,297 and 1,342,226 OP Units, respectively, were presented by the holders for redemption and were redeemed by the Company in exchange for an equal number of shares of Common Stock. The aggregate
book value of the OP Units that were redeemed, as measured for each OP Unit on the date of its redemption, was approximately $10.9 million and $30.6 million during the years ended December 31, 2008 and 2007, respectively.

On February 5, 2008, the Company issued 1,085,861 2008 OPP Units. Prior to the measurement date on February 5, 2011, 2008 OPP Units will be
entitled to receive per unit distributions equal to one-tenth (10%) of the regular quarterly distributions payable on an OP Unit, but will not be entitled to receive any special distributions. After the measurement date, the number of 2008 OPP
Units, both vested and unvested, which 2008 OPP award recipients have earned, if any, based on the establishment of an outperformance pool, will be entitled to receive distributions in an amount per unit equal to distributions, both regular and
special, payable on an OP Unit. For a complete description of the terms of the 2008 OPP Units (See Note 18).

On May 12, 2008, the
Company issued 150,000 OP Units to the selling entity as partial consideration for the Companys acquisition of the remaining development rights for its 250 West 55th Street development project located in New York City.

On June 9, 2008, the Company issued 102,883 OP Units to the selling entity as partial consideration for the Companys acquisition of its
interest in the General Motors Building located in New York City.

On April 30, 2008, the Company paid a distribution on the OP Units
and LTIP Units in the amount of $0.68 per unit and a distribution on the 2008 OPP Units in the amount of $0.068 per unit, in each case payable to holders of record as of the close of business on March 31, 2008. On July 31, 2008, the
Company paid a distribution on the OP Units and LTIP Units in the amount of $0.68 per unit and a distribution on the 2008 OPP Units in the amount of $0.068 per unit, in each case payable to holders of record as of the close of business on
June 30, 2008. On October 31, 2008, the Company paid a distribution on the OP Units and LTIP Units in the amount of $0.68 per unit and a distribution on the 2008 OPP Units in the amount of $0.068 per unit, in each case payable to holders
of record as of the close of business on September 30, 2008. On December 15, 2008, Boston Properties, Inc., as general partner of the Company, declared a distribution on the OP Units and LTIP Units in the amount of $0.68 per unit and a
distribution on the 2008 OPP Units in the amount of $0.068 per unit, in each case payable on January 30, 2009 to holders of record as of the close of business on December 31, 2008.

On December 17, 2007, Boston Properties, Inc., as general partner of the Company, declared a special cash distribution on the OP Units and LTIP
Units in the amount of $5.98 per unit which was paid on January 30, 2008 to unitholders of record as of the close of business on December 31, 2007. The special cash distribution was in addition to the regular quarterly distributions of
$0.68 per unit which were declared by Boston Properties, Inc., as general partner of the Company, during the year ended December 31, 2007.



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BOSTON PROPERTIES LIMITED PARTNERSHIP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



Preferred Units

The Preferred Units at December 31, 2008 consist solely of 1,113,044 Series Two Preferred Units, which bear a preferred distribution equal to the greater of (1) the distribution which would have been paid in
respect of the Series Two Preferred Unit had such Series Two Preferred Unit been converted into an OP Unit (including both regular and special distributions) or (2) an increasing rate, ranging from 5.00% to 7.00% per annum (7.00% for the
years ended December 31, 2008, 2007 and 2006) on a liquidation preference of $50.00 per unit, and are convertible into OP Units at a rate of $38.10 per Preferred Unit (1.312336 OP Units for each Preferred Unit). Distributions to holders of
Preferred Units are recognized on a straight-line basis that approximates the effective interest method.

Holders of Series Two Preferred
Units participated in the $5.98 per unit special cash distribution on an as-converted basis in connection with their regular May 2008 distribution payment as provided for in the Companys partnership agreement. At December 31, 2007, the
Company accrued approximately $8.7 million related to the $5.98 per unit special cash distribution payable to holders of the Series Two Preferred Units.

During the year ended December 31, 2007, 606,186 Series Two Preferred Units of the Company were converted by the holders into 795,520 OP Units. In addition, the Company paid the accrued preferred distributions
due to the holders of Preferred Units that were converted.

Due to the redemption option and the conversion option existing outside the
control of the Company, such Preferred Units are not included in Partners Capital and are reflected in the Consolidated Balance Sheets at an amount equivalent to the value of such units had such units been redeemed at December 31, 2008
and 2007. The value of the Series Two Preferred Units had such units been redeemed at December 31, 2008 was approximately $80.3 million based on the closing price of Boston Properties, Inc.s common stock of $55.00 per share. Included in
preferred distributions and allocation of undistributed earnings in the Consolidated Statements of Operations is accretion of approximately $0.5 million, $0.6 million and $1.2 million for the years ended December 31, 2008, 2007 and 2006,
respectively, which represents the accretion of Preferred Units from the value at issuance to the liquidation value.



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BOSTON PROPERTIES LIMITED PARTNERSHIP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



|13. | Partners Capital
|--- | -----------------

The following table
presents the changes in the issued and outstanding partners capital units since January 1, 2006:



|                                                                                                                 |  |                     |  |                      |  |                            
|---------------------------------------------------------------------------------------------------------------- |  | ------------------- |  | -------------------- |  | ---------------------------
|                                                                                                                 |  | GeneralPartnerUnits |  | LimitedPartner Units |  | TotalPartnersCapital Units
|Outstanding at January 1, 2006                                                                                   |  | 1,343,008           |  | 111,199,254          |  | 112,542,262                
|Units issued to Boston Properties, Inc. related to Common Stock issued for the conversion of Preferred Units     |  | 23,810              |  | 2,577,322            |  | 2,601,132                  
|Units issued to Boston Properties, Inc. related to Common Stock issued under the Employee Stock Purchase Plan    |  | 70                  |  | 7,563                |  | 7,633                      
|Units issued to Boston Properties, Inc. related to Common Stock issued under the Stock Option and Incentive Plan |  | 16,407              |  | 1,775,975            |  | 1,792,382                  
|Units issued to Boston Properties, Inc. related to Common Stock issued in exchange for OP Units                  |  | 5,127               |  | 555,006              |  | 560,133                    
|                                                                                                                 |  |                     |  |                      |  |                            
|Outstanding at December 31, 2006                                                                                 |  | 1,388,422           |  | 116,115,120          |  | 117,503,542                
|Units issued to Boston Properties, Inc. related to Common Stock issued for the conversion of Preferred Units     |  | 6,392               |  | 788,376              |  | 794,768                    
|Units issued to Boston Properties, Inc. related to Common Stock issued under the Employee Stock Purchase Plan    |  | 50                  |  | 6,116                |  | 6,166                      
|Units issued to Boston Properties, Inc. related to Common Stock issued under the Stock Option and Incentive Plan |  | 5,232               |  | 645,319              |  | 650,551                    
|Units issued to Boston Properties, Inc. related to Common Stock issued in exchange for OP Units                  |  | 4,403               |  | 543,055              |  | 547,458                    
|                                                                                                                 |  |                     |  |                      |  |                            
|Outstanding at December 31, 2007                                                                                 |  | 1,404,499           |  | 118,097,986          |  | 119,502,485                
|Units issued to Boston Properties, Inc. related to Common Stock issued under the Employee Stock Purchase Plan    |  | 73                  |  | 7,682                |  | 7,755                      
|Units issued to Boston Properties, Inc. related to Common Stock issued under the Stock Option and Incentive Plan |  | 9,823               |  | 1,029,295            |  | 1,039,118                  
|Units issued to Boston Properties, Inc. related to Common Stock issued in exchange for OP Units                  |  | 5,967               |  | 625,330              |  | 631,297                    
|                                                                                                                 |  |                     |  |                      |  |                            
|Outstanding at December 31, 2008                                                                                 |  | 1,420,362           |  | 119,760,293          |  | 121,180,655                
|                                                                                                                 |  |                     |  |                      |  |                            



|14. | Future Minimum Rents
|--- | --------------------

The Properties are leased to
tenants under net operating leases with initial term expiration dates ranging from 2009 to 2049. The future contractual minimum lease payments to be received (excluding operating expense reimbursements) by the Company as of December 31, 2008,
under non-cancelable operating leases which expire on various dates through 2049, are as follows:



|                          |  |                |          
|------------------------- |  | -------------- | ---------
|Years Ending December 31, |  | (in thousands)
|2009                      |  | $              | 1,129,873
|2010                      |  |                | 1,098,647
|2011                      |  |                | 1,082,856
|2012                      |  |                | 996,892  
|2013                      |  |                | 929,469  
|Thereafter                |  |                | 5,140,146



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BOSTON PROPERTIES LIMITED PARTNERSHIP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



No single tenant represented more than 10.0% of the Companys total rental revenue for the years
ended December 31, 2008, 2007 and 2006.



|15. | Segment Reporting
|--- | -----------------

The Companys segments are
based on the Companys method of internal reporting which classifies its operations by both geographic area and property type. The Companys segments by geographic area are Greater Boston, Greater Washington, DC, Midtown Manhattan, Greater
San Francisco and New Jersey. Segments by property type include: Class A Office, Office/Technical and Hotels.

Asset information by
segment is not reported because the Company does not use this measure to assess performance. Therefore, depreciation and amortization expense is not allocated among segments. Interest and other income, development and management services, general
and administrative expenses, interest expense, depreciation and amortization expense, net derivative losses, losses from investments in securities, losses from early extinguishments of debt, minority interests in property partnerships, income (loss)
from unconsolidated joint ventures, gains on sales of real estate and other assets, income from discontinued operations and gains on sales of real estate from discontinued operations are not included in Net Operating Income as internal reporting
addresses these items on a corporate level.

Net Operating Income is not a measure of operating results or cash flows from operating
activities as measured by accounting principles generally accepted in the United States of America, and it is not indicative of cash available to fund cash needs and should not be considered an alternative to cash flows as a measure of liquidity.
All companies may not calculate Net Operating Income in the same manner. The Company considers Net Operating Income to be an appropriate supplemental measure to net income because it helps both investors and management to understand the core
operations of the Companys properties.

Information by geographic area and property type (dollars in thousands):

For the year ended December 31, 2008:



|                     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|-------------------- |  | ------------- | ------- | - | -------------------- | - | ------- | ---------------- |  | - | ------------------- | - |  | --------- | ------- | - | ----- | - | ------ | - |  | - | --------- | -
|                     |  | GreaterBoston |         |   | GreaterWashington,DC |   |         | MidtownManhattan |  |   | GreaterSanFrancisco |   |  | NewJersey |         |   | Total |  
|Rental Revenue:      |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|Class A Office       |  | $             | 360,468 |   |                      | $ | 282,166 |                  |  | $ | 435,219             |   |  | $         | 214,202 |   |       | $ | 63,908 |   |  | $ | 1,355,963 |  
|Office/Technical     |  |               | 30,634  |   |                      |   | 15,455  |                  |  |   |                    |   |  |           |        |   |       |   |       |   |  |   | 46,089    |  
|Hotels               |  |               | 36,872  |   |                      |   |        |                  |  |   |                    |   |  |           |        |   |       |   |       |   |  |   | 36,872    |  
|                     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|Total                |  |               | 427,974 |   |                      |   | 297,621 |                  |  |   | 435,219             |   |  |           | 214,202 |   |       |   | 63,908 |   |  |   | 1,438,924 |  
|% of Grand Totals    |  |               | 29.74   | % |                      |   | 20.68   | %                |  |   | 30.25               | % |  |           | 14.89   | % |       |   | 4.44   | % |  |   | 100.0     | %
|Rental Expenses:     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|Class A Office       |  |               | 139,448 |   |                      |   | 82,227  |                  |  |   | 142,764             |   |  |           | 79,553  |   |       |   | 30,705 |   |  |   | 474,697   |  
|Office/Technical     |  |               | 9,650   |   |                      |   | 3,683   |                  |  |   |                    |   |  |           |        |   |       |   |       |   |  |   | 13,333    |  
|Hotels               |  |               | 27,510  |   |                      |   |        |                  |  |   |                    |   |  |           |        |   |       |   |       |   |  |   | 27,510    |  
|                     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|Total                |  |               | 176,608 |   |                      |   | 85,910  |                  |  |   | 142,764             |   |  |           | 79,553  |   |       |   | 30,705 |   |  |   | 515,540   |  
|% of Grand Totals    |  |               | 34.26   | % |                      |   | 16.66   | %                |  |   | 27.69               | % |  |           | 15.43   | % |       |   | 5.96   | % |  |   | 100.0     | %
|                     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|Net operating income |  | $             | 251,366 |   |                      | $ | 211,711 |                  |  | $ | 292,455             |   |  | $         | 134,649 |   |       | $ | 33,203 |   |  | $ | 923,384   |  
|                     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|% of Grand Totals    |  |               | 27.22   | % |                      |   | 22.93   | %                |  |   | 31.67               | % |  |           | 14.58   | % |       |   | 3.60   | % |  |   | 100.0     | %



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BOSTON PROPERTIES LIMITED PARTNERSHIP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



For the year ended December 31, 2007:



|                     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|-------------------- |  | ------------- | ------- | - | -------------------- | - | ------- | ---------------- |  | - | ------------------- | - |  | --------- | ------- | - | ----- | - | ------ | - |  | - | --------- | -
|                     |  | GreaterBoston |         |   | GreaterWashington,DC |   |         | MidtownManhattan |  |   | GreaterSanFrancisco |   |  | NewJersey |         |   | Total |  
|Rental Revenue:      |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|Class A Office       |  | $             | 336,974 |   |                      | $ | 240,413 |                  |  | $ | 443,382             |   |  | $         | 203,450 |   |       | $ | 67,582 |   |  | $ | 1,291,801 |  
|Office/Technical     |  |               | 28,085  |   |                      |   | 14,333  |                  |  |   |                    |   |  |           |        |   |       |   |       |   |  |   | 42,418    |  
|Hotels               |  |               | 37,811  |   |                      |   |        |                  |  |   |                    |   |  |           |        |   |       |   |       |   |  |   | 37,811    |  
|                     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|Total                |  |               | 402,870 |   |                      |   | 254,746 |                  |  |   | 443,382             |   |  |           | 203,450 |   |       |   | 67,582 |   |  |   | 1,372,030 |  
|% of Grand Totals    |  |               | 29.35   | % |                      |   | 18.57   | %                |  |   | 32.32               | % |  |           | 14.83   | % |       |   | 4.93   | % |  |   | 100.0     | %
|Rental Expenses:     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|Class A Office       |  |               | 129,643 |   |                      |   | 68,749  |                  |  |   | 137,404             |   |  |           | 78,597  |   |       |   | 29,422 |   |  |   | 443,815   |  
|Office/Technical     |  |               | 8,831   |   |                      |   | 3,194   |                  |  |   |                    |   |  |           |        |   |       |   |       |   |  |   | 12,025    |  
|Hotels               |  |               | 27,765  |   |                      |   |        |                  |  |   |                    |   |  |           |        |   |       |   |       |   |  |   | 27,765    |  
|                     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|Total                |  |               | 166,239 |   |                      |   | 71,943  |                  |  |   | 137,404             |   |  |           | 78,597  |   |       |   | 29,422 |   |  |   | 483,605   |  
|% of Grand Totals    |  |               | 34.38   | % |                      |   | 14.88   | %                |  |   | 28.41               | % |  |           | 16.25   | % |       |   | 6.08   | % |  |   | 100.0     | %
|                     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|Net operating income |  | $             | 236,631 |   |                      | $ | 182,803 |                  |  | $ | 305,978             |   |  | $         | 124,853 |   |       | $ | 38,160 |   |  | $ | 888,425   |  
|                     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|% of Grand Totals    |  |               | 26.63   | % |                      |   | 20.58   | %                |  |   | 34.44               | % |  |           | 14.05   | % |       |   | 4.30   | % |  |   | 100.0     | %

For the year ended December 31, 2006:



|                     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|-------------------- |  | ------------- | ------- | - | -------------------- | - | ------- | ---------------- |  | - | ------------------- | - |  | --------- | ------- | - | ----- | - | ------ | - |  | - | --------- | -
|                     |  | GreaterBoston |         |   | GreaterWashington,DC |   |         | MidtownManhattan |  |   | GreaterSanFrancisco |   |  | NewJersey |         |   | Total |  
|Rental Revenue:      |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|Class A Office       |  | $             | 305,576 |   |                      | $ | 214,245 |                  |  | $ | 515,401             |   |  | $         | 188,009 |   |       | $ | 64,717 |   |  | $ | 1,287,948 |  
|Office/Technical     |  |               | 26,973  |   |                      |   | 13,195  |                  |  |   |                    |   |  |           |        |   |       |   |       |   |  |   | 40,168    |  
|Hotels               |  |               | 33,014  |   |                      |   |        |                  |  |   |                    |   |  |           |        |   |       |   |       |   |  |   | 33,014    |  
|                     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|Total                |  |               | 365,563 |   |                      |   | 227,440 |                  |  |   | 515,401             |   |  |           | 188,009 |   |       |   | 64,717 |   |  |   | 1,361,130 |  
|% of Grand Totals    |  |               | 26.86   | % |                      |   | 16.71   | %                |  |   | 37.87               | % |  |           | 13.81   | % |       |   | 4.75   | % |  |   | 100.0     | %
|Rental Expenses:     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|Class A Office       |  |               | 117,377 |   |                      |   | 57,477  |                  |  |   | 154,957             |   |  |           | 71,809  |   |       |   | 28,221 |   |  |   | 429,841   |  
|Office/Technical     |  |               | 6,446   |   |                      |   | 1,418   |                  |  |   |                    |   |  |           |        |   |       |   |       |   |  |   | 7,864     |  
|Hotels               |  |               | 24,966  |   |                      |   |        |                  |  |   |                    |   |  |           |        |   |       |   |       |   |  |   | 24,966    |  
|                     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|Total                |  |               | 148,789 |   |                      |   | 58,895  |                  |  |   | 154,957             |   |  |           | 71,809  |   |       |   | 28,221 |   |  |   | 462,671   |  
|% of Grand Totals    |  |               | 32.16   | % |                      |   | 12.73   | %                |  |   | 33.49               | % |  |           | 15.52   | % |       |   | 6.10   | % |  |   | 100.0     | %
|                     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|Net operating income |  | $             | 216,774 |   |                      | $ | 168,545 |                  |  | $ | 360,444             |   |  | $         | 116,200 |   |       | $ | 36,496 |   |  | $ | 898,459   |  
|                     |  |               |         |   |                      |   |         |                  |  |   |                     |   |  |           |         |   |       |   |        |   |  |   |           |  
|% of Grand Totals    |  |               | 24.13   | % |                      |   | 18.76   | %                |  |   | 40.12               | % |  |           | 12.93   | % |       |   | 4.06   | % |  |   | 100.0     | %



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



The following is a reconciliation of Net Operating Income to net income available to common
unitholders (in thousands):



|                                                                 |  |                          |          |   |      |   |           |      |  |   |          
|---------------------------------------------------------------- |  | ------------------------ | -------- | - | ---- | - | --------- | ---- |  | - | ---------
|                                                                 |  | Years ended December 31,
|                                                                 |  | 2008                     |          |   | 2007 |   |           | 2006
|Net operating income                                             |  | $                        | 923,384  |   |      | $ | 888,425   |      |  | $ | 898,459  
|Add:                                                             |  |                          |          |   |      |   |           |      |  |   |          
|Development and management services                              |  |                          | 30,518   |   |      |   | 20,553    |      |  |   | 19,820   
|Interest and other                                               |  |                          | 18,958   |   |      |   | 89,706    |      |  |   | 36,677   
|Minority interests in property partnerships                      |  |                          | (1,997   | ) |      |   | (84       | )    |  |   | 2,013    
|Income (loss) from unconsolidated joint ventures                 |  |                          | (182,018 | ) |      |   | 20,428    |      |  |   | 24,507   
|Gains on sales of real estate and other assets                   |  |                          | 33,340   |   |      |   | 957,406   |      |  |   | 727,131  
|Gains on sales of real estate from discontinued operations       |  |                          |         |   |      |   | 266,817   |      |  |   |         
|Income from discontinued operations                              |  |                          |         |   |      |   | 7,274     |      |  |   | 19,081   
|Less:                                                            |  |                          |          |   |      |   |           |      |  |   |          
|General and administrative                                       |  |                          | 72,365   |   |      |   | 69,882    |      |  |   | 59,375   
|Interest expense                                                 |  |                          | 271,972  |   |      |   | 285,887   |      |  |   | 298,260  
|Depreciation and amortization                                    |  |                          | 296,122  |   |      |   | 278,249   |      |  |   | 266,411  
|Net derivative losses                                            |  |                          | 17,021   |   |      |   |          |      |  |   |         
|Losses from investments in securities                            |  |                          | 4,604    |   |      |   |          |      |  |   |         
|Losses from early extinguishments of debt                        |  |                          |         |   |      |   | 3,417     |      |  |   | 32,143   
|Preferred distributions and allocation of undistributed earnings |  |                          | 4,226    |   |      |   | 15,014    |      |  |   | 22,814   
|                                                                 |  |                          |          |   |      |   |           |      |  |   |          
|Net income available to common unitholders                       |  | $                        | 155,875  |   |      | $ | 1,598,076 |      |  | $ | 1,048,685
|                                                                 |  |                          |          |   |      |   |           |      |  |   |          



|16. | Earnings Per Common Unit
|--- | ------------------------

Earnings per common unit
has been computed pursuant to the provisions of SFAS No. 128. The following table provides a reconciliation of both the net income and the number of common units used in the computation of basic earnings per common unit, which is calculated by
dividing net income available to common unitholders by the weighted-average number of common units outstanding during the period. During 2004, the Company adopted EITF 03-6 Participating Securities and the Two-Class Method under FASB 128
(EITF 03-6), which provides further guidance on the definition of participating securities. Pursuant to EITF 03-6, the Companys Series Two Preferred Units, which are reflected as Redeemable Partnership Units in the Companys
Consolidated Balance Sheets, are considered participating securities and are included in the computation of basic and diluted earnings per common unit of the Company if the effect of applying the if-converted method is dilutive. The terms of the
Series Two Preferred Units enable the holders to obtain OP Units of the Company. Accordingly, for the reporting periods in which the Companys net income is in excess of distributions paid on the OP Units, LTIP Units and Series Two Preferred
Units, such income is allocated to the OP Units, LTIP Units and Series Two Preferred Units in proportion to their respective interests and the impact is included in the Companys consolidated basic and diluted earnings per common unit
computation. For the year ended December 31, 2007, approximately $4.6 million was allocated to the Series Two Preferred Units in excess of distributions paid during the reporting period and is included in the Companys computation of basic
and diluted earnings per common unit. There were no amounts required to be allocated to the Series Two Preferred Units for the years ended December 31, 2008 and 2006. Because the 2008 OPP Units require Boston Properties, Inc. to outperform
absolute and relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, the Company excludes all contingently issuable units from the diluted earnings per common unit calculation. For the year
ended December 31, 2008, the absolute and relative return thresholds for the 2008 OPP Units were not met and as a result the 2008 OPP Units have been excluded from the diluted earnings per



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



common unit calculation. Other potentially dilutive common units and the related impact on earnings are considered when calculating diluted earnings per
common unit. Included in the number of units (the denominator) below are approximately 20,356,000, 20,451,000 and 21,202,000 redeemable common units for the years ended December 31, 2008, 2007 and 2006, respectively.



|                                           |  |                                             |         |                    |         |                |   |       |  
|------------------------------------------ |  | ------------------------------------------- | ------- | ------------------ | ------- | -------------- | - | ----- | -
|                                           |  | For the year ended December 31, 2008        |        
|                                           |  | Income(Numerator)                           |         | Units(Denominator) |         | Per UnitAmount |  
|                                           |  | (in thousands, except for per unit amounts) |        
|Basic Earnings:                            |  |                                             |         |                    |         |                |   |       |  
|Net income available to common unitholders |  | $                                           | 155,875 |                    | 140,336 |                | $ | 1.11  |  
|Effect of Dilutive Securities:             |  |                                             |         |                    |         |                |   |       |  
|Stock Based Compensation                   |  |                                             |        |                    | 1,319   |                |   | (0.01 | )
|Diluted Earnings:                          |  |                                             |         |                    |         |                |   |       |  
|                                           |  |                                             |         |                    |         |                |   |       |  
|Net income                                 |  | $                                           | 155,875 |                    | 141,655 |                | $ | 1.10  |  
|                                           |  |                                             |         |                    |         |                |   |       |  



|                                                                      |  |                                             |           |                    |         |                |   |       |  
|--------------------------------------------------------------------- |  | ------------------------------------------- | --------- | ------------------ | ------- | -------------- | - | ----- | -
|                                                                      |  | For the year ended December 31, 2007        |          
|                                                                      |  | Income(Numerator)                           |           | Units(Denominator) |         | Per UnitAmount |  
|                                                                      |  | (in thousands, except for per unit amounts) |          
|Basic Earnings:                                                       |  |                                             |           |                    |         |                |   |       |  
|Income available to common unitholders before discontinued operations |  | $                                           | 1,323,985 |                    | 139,290 |                | $ | 9.50  |  
|Discontinued operations                                               |  |                                             | 274,091   |                    |        |                |   | 1.97  |  
|                                                                      |  |                                             |           |                    |         |                |   |       |  
|Net income available to common unitholders                            |  |                                             | 1,598,076 |                    | 139,290 |                |   | 11.47 |  
|Effect of Dilutive Securities:                                        |  |                                             |           |                    |         |                |   |       |  
|Stock Based Compensation                                              |  |                                             |          |                    | 1,763   |                |   | (0.14 | )
|Exchangeable Senior Notes                                             |  |                                             |          |                    | 178     |                |   | (0.01 | )
|Diluted Earnings:                                                     |  |                                             |           |                    |         |                |   |       |  
|                                                                      |  |                                             |           |                    |         |                |   |       |  
|Net income                                                            |  | $                                           | 1,598,076 |                    | 141,231 |                | $ | 11.32 |  
|                                                                      |  |                                             |           |                    |         |                |   |       |  
|                                                                      | 
|                                                                      |  | For the year ended December 31, 2006        |          
|                                                                      |  | Income(Numerator)                           |           | Units(Denominator) |         | Per UnitAmount |  
|                                                                      |  | (in thousands, except for per unit amounts) |          
|Basic Earnings:                                                       |  |                                             |           |                    |         |                |   |       |  
|Income available to common unitholders before discontinued operations |  | $                                           | 1,029,604 |                    | 135,923 |                | $ | 7.58  |  
|Discontinued operations                                               |  |                                             | 19,081    |                    |        |                |   | 0.14  |  
|                                                                      |  |                                             |           |                    |         |                |   |       |  
|Net income available to common unitholders                            |  |                                             | 1,048,685 |                    | 135,923 |                |   | 7.72  |  
|Effect of Dilutive Securities:                                        |  |                                             |           |                    |         |                |   |       |  
|Stock Based Compensation                                              |  |                                             |          |                    | 2,356   |                |   | (0.14 | )
|Diluted Earnings:                                                     |  |                                             |           |                    |         |                |   |       |  
|                                                                      |  |                                             |           |                    |         |                |   |       |  
|Net income                                                            |  | $                                           | 1,048,685 |                    | 138,279 |                | $ | 7.58  |  
|                                                                      |  |                                             |           |                    |         |                |   |       |  



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



|17. | Employee Benefit Plans
|--- | ----------------------

Effective January 1,
1985, the predecessor of the Company adopted a 401(k) Savings Plan (the Plan) for its employees. Under the Plan, as amended, employees, as defined, are eligible to participate in the Plan after they have completed three months of
service. Upon formation, the Company adopted the Plan and the terms of the Plan.

Effective January 1, 2000, the Company amended the
Plan by increasing the Companys matching contribution to 200% of the first 3% from 200% of the first 2% of participants eligible earnings contributed (utilizing earnings that are not in excess of an amount established by the IRS
($225,000 in 2007 and $230,000 in 2008), indexed for inflation) and by eliminating the vesting requirement. The Companys aggregate matching contribution for the years ended December 31, 2008, 2007 and 2006 was $2.7 million, $2.1 million
and $2.2 million, respectively.

Effective January 1, 2001, the Company amended the Plan to provide a supplemental retirement
contribution to employees who have at least ten years of service on January 1, 2001, and who are 40 years of age or older as of January 1, 2001. The maximum supplemental retirement contribution will not exceed the annual limit on
contributions established by the Internal Revenue Service. The Company will record an annual supplemental retirement credit for the benefit of each participant. The Companys supplemental retirement contribution and credit for the years ended
December 31, 2008, 2007 and 2006 was $210,000, $178,000 and $191,000, respectively.

The Company also maintains a deferred
compensation plan that is designed to allow officers of the Company to defer a portion of their current income on a pre-tax basis and receive a tax-deferred return on these deferrals. The Companys obligation under the plan is that of an
unsecured promise to pay the deferred compensation to the plan participants in the future. At December 31, 2008 and 2007, the Company has funded approximately $6.6 million and $8.3 million, respectively, into a separate account, which is not
restricted as to its use. The Companys liability under the plan is equal to the total amount of compensation deferred by the plan participants and earnings on the deferred compensation pursuant to investments elected by the plan participants.
The Companys liability as of December 31, 2008 and 2007 was $6.3 million and $8.3 million, respectively, which are included in the accompanying Consolidated Balance Sheets.



|18. | Stock Option and Incentive Plan and Stock Purchase Plan
|--- | -------------------------------------------------------

Boston Properties, Inc. has established a stock option and incentive plan for the purpose of attracting and retaining qualified employees and rewarding them for superior performance in achieving the Companys business goals and
enhancing stockholder value.

At Boston Properties, Inc.s 2007 annual meeting of stockholders held on May 15, 2007, Boston
Properties, Inc.s stockholders approved an amendment and restatement of Boston Properties, Inc.s 1997 Stock Option and Incentive Plan (the 1997 Plan) that, among other things, (1) increased the limit on full value shares
(i.e., awards other than stock options) that may be issued under the Plan by 2,500,000 shares, (2) extended the term of the Plan to May 15, 2017 and (3) added provisions that allow Boston Properties, Inc. to qualify certain grants
under the Plan as performance-based compensation under Section 162(m) of the Internal Revenue Code.

Under the amended
plan, the number of shares of Common Stock of Boston Properties, Inc. available for issuance is 4,019,174 shares. At December 31, 2008, the number of shares available for issuance under the plan was 2,489,545, of which a maximum of 2,036,086
shares may be granted as awards other than stock options.



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



Options granted under the plan became exercisable over a two-, three- or five-year period and have
terms of ten years, as determined at the time of the grant. All options were granted at the fair market value of Boston Properties, Inc.s Common Stock at the dates of grant. As of January 17, 2005, all outstanding options had become fully
vested and exercisable.

On January 24, 2008, the Compensation Committee (the Committee) of the Board of Directors (the
Board) of Boston Properties, Inc. approved outperformance awards under the 1997 Plan to officers and key employees of Boston Properties, Inc. These awards (the 2008 OPP Awards) are part of a new broad-based, long-term
incentive compensation program designed to provide the Companys management team at several levels within the organization with the potential to earn equity awards subject to Boston Properties, Inc. outperforming and creating
shareholder value in a pay-for-performance structure. 2008 OPP Awards utilize total return to shareholders (TRS) over a three-year measurement period as the performance metric and include two years of time-based vesting after the end of
the performance measurement period (subject to acceleration in certain events) as a retention tool. Recipients of 2008 OPP Awards will share in an outperformance pool if Boston Properties, Inc.s TRS, including both share appreciation and
dividends, exceeds absolute and relative hurdles over a three-year measurement period from February 5, 2008 to February 5, 2011, based on the average closing price of a share of Boston Properties, Inc.s common stock (a REIT
Share) of $92.8240 for the five trading days prior to and including February 5, 2008. The aggregate reward that recipients of all 2008 OPP Awards can earn, as measured by the outperformance pool, is subject to a maximum cap of $110
million, although only awards for an aggregate of up to approximately $104.8 million have been granted to date. The balance remains available for future grants, with OPP awards exceeding a potential reward of $1 million requiring the
Committees approval.

The outperformance pool will consist of (i) three percent (3%) of the excess total return above a
cumulative absolute TRS hurdle of 30% over the full three-year measurement period (the Absolute TRS Component) and (ii) three percent (3%) of the excess or deficient excess total return above or below a relative TRS hurdle
equal to the total return of the SNL Equity REIT Index over the three-year measurement period (the Relative TRS Component). In the event that the Relative TRS Component is potentially positive because Boston Properties, Inc.s TRS
is higher than the total return of the SNL Equity REIT Index, the actual contribution to the outperformance pool from the Relative TRS Component will be subject to a sliding scale factor as follows: (i) 100% of the potential Relative TRS
Component will be earned if Boston Properties, Inc.s TRS is equal to or greater than a cumulative 30% over three years (equivalent to 10% per annum), (ii) 0% will be earned if Boston Properties, Inc.s TRS is equal to or less
than a cumulative 21% over three years (equivalent to 7% per annum), and (iii) a percentage from 0% to 100% calculated by linear interpolation will be earned if Boston Properties, Inc.s cumulative TRS over three years is between 21%
and 30%. The potential Relative TRS Component before application of the sliding scale factor will be capped at $110 million (or such lesser amount as corresponds to the OPP awards actually granted). In the event that the Relative TRS Component is
negative because Boston Properties, Inc.s TRS is less than the total return of the SNL Equity REIT Index, any outperformance reward potentially earned under the Absolute TRS Component will be reduced dollar for dollar, provided that the
potential Absolute TRS Component before reduction for any negative Relative TRS Component will be capped at $110 million (or such lesser amount as corresponds to the OPP awards actually granted). The algebraic sum of the Absolute TRS Component and
the Relative TRS Component determined as described above will never exceed $110 million (or such lesser amount as corresponds to the OPP awards actually granted).

Each employees 2008 OPP Award is designated as a specified percentage of the aggregate outperformance pool. Assuming the applicable absolute and/or relative TRS thresholds are achieved at the end of the
measurement period, the algebraic sum of the Absolute TRS Component and the Relative TRS Component will be calculated and then allocated among the 2008 OPP Award recipients in accordance with each individuals percentage. Rewards earned with
respect to 2008 OPP Awards will vest 25% on February 5, 2011, 25% on



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February 5, 2012, and 50% on February 5, 2013, based on continued employment. Vesting will be accelerated in the event of a change of control of
Boston Properties, Inc., termination of employment by Boston Properties, Inc. without cause or termination of employment by the award recipient for good reason, death, disability or retirement, although restrictions on transfer will continue to
apply in certain of these situations. 2008 OPP Awards are in the form of LTIP units of limited partnership interest of the Company, which are referred to herein as 2008 OPP Units. 2008 OPP Units were issued prior to the determination of
the outperformance pool, but will remain subject to forfeiture depending on the extent of rewards earned with respect to 2008 OPP Awards. The number of 2008 OPP Units issued initially to recipients of the 2008 OPP Awards was an estimate of the
maximum number of 2008 OPP Units that they could earn, based on certain assumptions. The number of 2008 OPP Units actually earned by each award recipient, if any, will be determined at the end of the performance measurement period by dividing his or
her share of the outperformance pool by the average closing price of a share of common stock for the 15 trading days immediately preceding the measurement date. Total return for Boston Properties, Inc. and for the SNL Equity REIT Index over the
three-year measurement period and other circumstances will determine how many 2008 OPP Units are earned by each recipient; if they are fewer than the number issued initially, the balance will be forfeited as of the performance measurement date.

Prior to the measurement date, 2008 OPP Units will be entitled to receive per unit distributions equal to one-tenth (10%) of the
regular quarterly distributions payable on an OP Unit, but will not be entitled to receive any special distributions. After the measurement date, the number of 2008 OPP Units, both vested and unvested, which employees have earned based on the
establishment of an outperformance pool, will be entitled to receive distributions in an amount per unit equal to distributions, both regular and special, payable on an OP Unit.

Boston Properties, Inc. issued 4,723, 6,536 and 9,182 shares of restricted stock and the Company issued 288,507, 156,161 and 147,845 LTIP Units and
1,085,861, 0 and 0 2008 OPP Units under the 1997 Plan during the years ended December 31, 2008, 2007 and 2006, respectively. The shares of restricted stock were valued at approximately $0.5 million ($96.09 per share weighted-average), $0.8
million ($125.46 per share weighted-average) and $0.8 million ($89.03 per share weighted-average) for the years ended December 31, 2008, 2007 and 2006, respectively. The 2008 OPP Units were valued at approximately $19.7 million utilizing a
Monte Carlo simulation to estimate the probability of the performance vesting conditions being satisfied. The Monte Carlo simulation used a statistical formula underlying the Black-Scholes and binomial formulas and such simulation was run
approximately 100,000 times. For each simulation, the payoff is calculated at the settlement date, which is then discounted to the award date at a risk-free interest rate. The average of the values over all simulations is the expected value of the
unit on the award date. Assumptions used in the valuations included (1) factors associated with the underlying performance of Boston Properties, Inc.s stock price and total shareholder return over the term of the performance awards
including total stock return volatility and risk-free interest and (2) factors associated with the relative performance of Boston Properties, Inc.s stock price and total shareholder return when compared to the SNL Equity REIT Index. The
valuation was performed in a risk-neutral framework, so no assumption was made with respect to an equity risk premium. LTIP Units were valued using a Monte Carlo simulation method model in accordance with the provisions of SFAS No. 123R. LTIP
Units issued during the years ended December 31, 2008, 2007 and 2006 were valued at approximately $25.4 million, $18.0 million and $11.2 million, respectively. The weighted-average per unit fair value of LTIP Unit grants in 2008, 2007 and 2006
was $88.08, $115.47 and $75.64, respectively. The per unit fair value of each LTIP Unit granted in 2008, 2007 and 2006 was estimated on the date of grant using the following assumptions; an expected life of 5.6 years, 5.3 years and 6.5 years, a
risk-free interest rate of 2.75%, 4.82% and 4.97% and an expected price volatility of 25.00%, 18.00% and 17.84%, respectively. An LTIP Unit is generally the economic equivalent of a share of restricted stock in Boston Properties, Inc. The aggregate
value of the LTIP Units is included in Redeemable Partnership Units in the Consolidated Balance Sheets. The restricted stock and LTIP Units granted to employees between January 1, 2004 and November 2006 vest over a five-year term. Grants of
restricted stock and LTIP Units made on and after November 22, 2006 vest in four equal annual installments. Restricted stock and LTIP



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Units are measured at fair value on the date of grant based on the number of shares or units granted, as adjusted for forfeitures and the price of Boston
Properties, Inc.s Common Stock on the date of grant as quoted on the New York Stock Exchange. Such value is recognized as an expense ratably over the corresponding employee service period. Dividends paid on both vested and unvested shares of
restricted stock are charged directly to Partners Capital and Redeemable Partnership Units, respectively, in the Consolidated Balance Sheets. Stock-based compensation expense associated with restricted stock, LTIP Units and 2008 OPP Units was
approximately $22.1 million, $11.4 million and $7.7 million for the years ended December 31, 2008, 2007 and 2006, respectively. At December 31, 2008, there was $46.7 million of unrecognized compensation cost related to unvested restricted
stock, LTIP Units and 2008 OPP Units that is expected to be recognized over a weighted-average period of approximately 3.0 years.

In
connection with the declaration of the special cash distributions of $5.98 per unit paid on January 30, 2008 to unitholders of record on December 31, 2007 and $5.40 per unit paid on January 30, 2007 to unitholders of record on
December 29, 2006, Boston Properties, Inc.s Board of Directors approved adjustments to all its outstanding stock option awards that were intended to ensure that its employees, directors and other persons who held such stock options were
not disadvantaged by the special cash distributions. The exercise prices and number of all outstanding options were adjusted as of the close of business on the last trading day prior to the related ex-dividend date such that each option
had the same fair value to the holder before and after giving effect to the payment of the special cash distribution. Accordingly, pursuant to the provisions of SFAS No. 123R, no compensation cost has been recognized in the Consolidated
Statements of Operations in connection with such adjustments. As a result, effective as of the close of business on December 26, 2007, 2,131,556 outstanding stock options with a weighted-average exercise price of $37.42 were adjusted to
2,264,535 outstanding options with a weighted-average exercise price of $35.22 and effective as of the close of business on December 26, 2006, 2,655,275 outstanding stock options with a weighted-average exercise price of $39.37 were adjusted to
2,788,634 outstanding options with a weighted-average exercise price of $37.49. There were no other adjustments to the terms of the outstanding stock option awards.

A summary of the status of Boston Properties, Inc.s stock options as of December 31, 2008, 2007 and 2006 and changes during the years ended December 31, 2008, 2007 and 2006 are presented below:



|                                 |  |            |   |  |                              |      
|-------------------------------- |  | ---------- | - |  | ---------------------------- | -----
|                                 |  | Shares     |   |  | WeightedAverageExercisePrice
|Outstanding at December 31, 2005 |  | 4,451,488  |   |  | $                            | 37.63
|Granted                          |  |           |   |  |                              |     
|Exercised                        |  | (1,793,418 | ) |  | $                            | 35.05
|Canceled                         |  | (75        | ) |  | $                            | 28.31
|Special Dividend Adjustment      |  | 133,359    |   |  | $                            | 37.49
|                                 |  |            |   |  |                              |      
|Outstanding at December 31, 2006 |  | 2,791,354  |   |  | $                            | 37.49
|Granted                          |  |           |   |  |                              |     
|Exercised                        |  | (659,798   | ) |  | $                            | 37.71
|Canceled                         |  |           |   |  |                              |     
|Special Dividend Adjustment      |  | 132,979    |   |  | $                            | 35.22
|                                 |  |            |   |  |                              |      
|Outstanding at December 31, 2007 |  | 2,264,535  |   |  | $                            | 35.22
|Granted                          |  |           |   |  |                              |     
|Exercised                        |  | (1,058,133 | ) |  | $                            | 36.36
|Canceled                         |  |           |   |  |                              |     
|                                 |  |            |   |  |                              |      
|Outstanding at December 31, 2008 |  | 1,206,402  |   |  | $                            | 34.23
|                                 |  |            |   |  |                              |      



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



The following table summarizes information about stock options outstanding at December 31, 2008:



|                         |  |                              |  |                                           |  |                                |  |                               |  |                               
|------------------------ |  | ---------------------------- |  | ----------------------------------------- |  | ------------------------------ |  | ----------------------------- |  | ------------------------------
|Options Outstanding      |  | Options Exercisable         
|Range of Exercise Prices |  | NumberOutstanding at12/31/08 |  | Weighted-AverageRemainingContractual Life |  | Weighted-AverageExercise Price |  | Number Exercisableat 12/31/08 |  | Weighted-AverageExercise Price
|$26.34-$36.45            |  | 1,206,402                    |  | 2.5 Years                                 |  | $34.23                         |  | 1,206,402                     |  | $34.23                        

The total intrinsic value of the outstanding and exercisable stock options as of December 31,
2008 was approximately $25.1 million. In addition, the Company had 2,264,535 and 2,791,354 options exercisable at weighted-average exercise prices of $35.22 and $37.49 at December 31, 2007 and 2006, respectively.

Boston Properties, Inc. adopted the 1999 Non-Qualified Employee Stock Purchase Plan (the Stock Purchase Plan) to encourage the ownership of
Common Stock by eligible employees. The Stock Purchase Plan became effective on January 1, 1999 with an aggregate maximum of 250,000 shares of Common Stock available for issuance. The Stock Purchase Plan provides for eligible employees to
purchase on the business day immediately following the end of the biannual purchase periods (i.e., January 1-June 30 and July 1-December 31) shares of Common Stock at a purchase price equal to 85% of the average closing prices of
the Common Stock during the last ten business days of the purchase period. The Company issued 7,755, 6,166 and 7,633 shares with the weighted average purchase price equal to $80.80 per share, $90.98 per share and $69.02 per share under the Stock
Purchase Plan during the years ended December 31, 2008, 2007 and 2006, respectively.



|19. | Selected Interim Financial Information (unaudited)
|--- | --------------------------------------------------

The tables below reflect the Companys selected quarterly information for the years ended December 31, 2008 and 2007. Total revenue and income from continuing operations amounts for the year ended December 31, 2007 have been
reclassified for properties qualifying for discontinued operations presentation under SFAS No. 144.



|                                                               |  |                                             |           |          |   |               |  |              |         |  |   |          |  
|-------------------------------------------------------------- |  | ------------------------------------------- | --------- | -------- | - | ------------- |  | ------------ | ------- |  | - | -------- | -
|                                                               |  | 2008 Quarter Ended                          |          
|                                                               |  | March 31,                                   |           | June 30, |   | September 30, |  | December 31, |        
|                                                               |  | (in thousands, except for per unit amounts) |          
|Total revenue                                                  |  | $                                           | 371,432   |          | $ | 368,680       |  | $            | 357,988 |  | $ | 390,300  |  
|Income (loss) from continuing operations                       |  | $                                           | 83,427    |          | $ | 90,237        |  | $            | 58,438  |  | $ | (105,341 | )
|Net income (loss) available to common unitholders              |  | $                                           | 105,728   |          | $ | 95,368        |  | $            | 59,138  |  | $ | (104,470 | )
|Income (loss) available to common unitholders per unitbasic   |  | $                                           | 0.76      |          | $ | 0.68          |  | $            | 0.42    |  | $ | (0.74    | )
|Income (loss) available to common unitholders per unitdiluted |  | $                                           | 0.75      |          | $ | 0.67          |  | $            | 0.42    |  | $ | (0.74    | )
|                                                               | 
|                                                               |  | 2007 Quarter Ended                          |          
|                                                               |  | March 31,                                   |           | June 30, |   | September 30, |  | December 31, |        
|                                                               |  | (in thousands, except for per unit amounts) |          
|Total revenue                                                  |  | $                                           | 360,703   |          | $ | 372,213       |  | $            | 368,584 |  | $ | 380,790  |  
|Income from continuing operations                              |  | $                                           | 83,450    |          | $ | 108,032       |  | $            | 88,433  |  | $ | 101,678  |  
|Net income available to common unitholders                     |  | $                                           | 1,023,970 |          | $ | 122,519       |  | $            | 289,723 |  | $ | 150,998  |  
|Income available to common unitholders per unitbasic          |  | $                                           | 7.37      |          | $ | 0.88          |  | $            | 2.08    |  | $ | 1.08     |  
|Income available to common unitholders per unitdiluted        |  | $                                           | 7.24      |          | $ | 0.87          |  | $            | 2.05    |  | $ | 1.07     |  



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BOSTON PROPERTIES LIMITED PARTNERSHIP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



|20. | Held for Sale/Discontinued Operations
|--- | -------------------------------------

The Company
applies the provisions of SFAS No. 144, Accounting for the Impairment or Disposal of Long-Lived Assets. SFAS No. 144 requires that long-lived assets that are to be disposed of by sale be measured at the lesser of (1) book
value or (2) fair value less cost to sell. In addition, it requires that one accounting model be used for long-lived assets to be disposed of by sale and broadens the presentation of discontinued operations to include more disposal
transactions.

On January 7, 2008, the Company transferred at cost Mountain View Research Park and Mountain View Technology Park to
its Value-Added Fund for an aggregate of approximately $221.6 million (See Note 3). At December 31, 2007, the Company had categorized the properties as Held for Sale in its Consolidated Balance Sheets. Due to the Companys
continuing involvement through its ownership interest in the Value-Added Fund, these properties have not been categorized as discontinued operations in the accompanying Consolidated Statements of Operations.

During the year ended December 31, 2007, the Company sold the following operating properties:



| |  |  | Orbital Sciences Campus and Broad Run Business Park, Building E, comprised of three Class A office properties aggregating approximately 337,000 net rentable
square feet and an office/technical property totaling approximately 127,000 net rentable square feet, respectively, located in Loudon County, Virginia;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Democracy Center, a Class A office complex totaling approximately 685,000 net rentable square feet located in Bethesda, Maryland;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------



| |  |  | Newport Office Park, a Class A office property totaling approximately 172,000 net rentable square feet located in Quincy, Massachusetts;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Long Wharf Marriott, a 402-room hotel located in Boston, Massachusetts; and
| | - |  | ---------------------------------------------------------------------------



| |  |  | 5 Times Square, a Class A office property totaling approximately 1,102,000 net rentable square feet located in New York City.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------

During the year ended December 31, 2006, the Company sold 280 Park Avenue, a Class A office property totaling approximately 1,179,000 net
rentable square feet located in midtown Manhattan.

Due to the Companys continuing involvement in the management, for a fee, of 280
Park Avenue and 5 Times Square through agreements with the buyers and other financial obligations to the buyers, 280 Park Avenue and 5 Times Square have not been categorized as discontinued operations in the accompanying Consolidated Statements of
Operations. Due to the Companys continuing involvement in the management, for a fee, of the Democracy Center property through an agreement with the buyer which was entered into at closing, this property is not categorized as discontinued
operations in the accompanying Consolidated Statements of Operations. As a result, the gains on sales related to these properties have been reflected under the caption Gains on sales of real estate and other assets in the Consolidated
Statements of Operations. The Company has presented the other properties listed above as discontinued operations in its Consolidated Statements of Operations for the years ended December 31, 2007 and 2006, as applicable.



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BOSTON PROPERTIES LIMITED PARTNERSHIP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



The following table summarizes income from discontinued operations and the related realized gains on
sales of real estate from discontinued operations for the years ended December 31, 2008, 2007 and 2006:



|                                       |  |                                 |   |      |   |         |      |  |   |         |  
|-------------------------------------- |  | ------------------------------- | - | ---- | - | ------- | ---- |  | - | ------- | -
|                                       |  | For the Year Ended December 31, |  
|                                       |  | 2008                            |   | 2007 |   |         | 2006 | 
|                                       |  | (in thousands)                  |  
|Total revenue                          |  | $                               |  |      | $ | 19,665  |      |  | $ | 59,959  |  
|Operating expenses                     |  |                                 |  |      |   | (9,443  | )    |  |   | (34,681 | )
|Depreciation and Amortization          |  |                                 |  |      |   | (2,948  | )    |  |   | (6,197  | )
|                                       |  |                                 |   |      |   |         |      |  |   |         |  
|Income from discontinued operations    |  | $                               |  |      | $ | 7,274   |      |  | $ | 19,081  |  
|                                       |  |                                 |   |      |   |         |      |  |   |         |  
|Realized gains on sales of real estate |  | $                               |  |      | $ | 266,817 |      |  | $ |        |  
|                                       |  |                                 |   |      |   |         |      |  |   |         |  

The Companys application of SFAS No. 144 results in the presentation of the net
operating results of these qualifying properties sold or designated as held for sale during 2008, 2007 and 2006, as income from discontinued operations for all periods presented. In addition, SFAS No. 144 results in the gains on
sale of these qualifying properties totaling approximately $266.8 million to be reflected as gains on sales of real estate from discontinued operations in the accompanying Consolidated Statements of Operations for the year ended December 31,
2007. The application of SFAS No. 144 does not have an impact on net income available to common unitholders. SFAS No. 144 only impacts the presentation of these properties within the Consolidated Statements of Operations.



|21. | Newly Issued Accounting Standards
|--- | ---------------------------------

In September
2006, the Financial Accounting Standards Board (the FASB) issued Statement of Financial Accounting Standards (SFAS) No. 157, Fair Value Measurements (SFAS No. 157). SFAS No. 157 defines
fair value and establishes a framework for measuring fair value, which includes a hierarchy based on the quality of inputs used to measure fair value. SFAS No. 157 also expands disclosures about fair value measurements. SFAS No. 157 does
not require any new fair value measurements. SFAS No. 157 requires the categorization of financial assets and liabilities, based on the inputs to the valuation technique, into a three-level fair value hierarchy. The fair value hierarchy gives
the highest priority to the quoted prices in active markets for identical assets and liabilities and lowest priority to unobservable inputs. SFAS No. 157 requires the use of observable market data, when available, in making fair value
measurements. When inputs used to measure fair value fall within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value
measurement. The levels of the SFAS No. 157 fair value hierarchy are described as follows:



| |  |  | Level 1Financial assets and liabilities whose values are based on unadjusted quoted market prices for identical assets and liabilities in an active market
that the Company has the ability to access.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Level 2Financial assets and liabilities whose values are based on quoted prices in markets that are not active or model inputs that are observable for
substantially the full term of the asset or liability.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Level 3Financial assets and liabilities whose values are based on prices or valuation techniques that require inputs that are both unobservable and
significant to the overall fair value measurement.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

SFAS No. 157 became effective for fiscal years beginning after
November 15, 2007. In February 2008, the FASB deferred the effective date of SFAS No. 157 for one year for nonfinancial assets and nonfinancial liabilities that are recognized or disclosed at fair value in the financial statements on a
nonrecurring basis. The FASB also removed certain leasing transactions from the scope of SFAS No. 157. On January 1, 2008, the



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



Company adopted SFAS No. 157. The Company has financial instruments consisting of investments in securities and interest rate contracts that are
required to be measured under SFAS No. 157. The Company currently does not have any non-financial assets or non-financial liabilities that are required to be measured under SFAS No. 157. The Company does not have any fair value
measurements using significant unobservable inputs (Level 3) as of December 31, 2008.

The Companys investments in securities,
which were valued at approximately $11.6 million at December 31, 2008, are categorized within Level 2 of the fair value hierarchy because they are valued using quoted market prices, broker or dealer quotations, or alternative pricing sources
with reasonable levels of price transparency. The Company utilized Level 3 inputs in its assessment of the other-than-temporary impairments related to certain of its investments in unconsolidated joint ventures (See Note 5).

In February 2007, the FASB issued SFAS No. 159, The Fair Value Option for Financial Assets and Financial LiabilitiesIncluding an
amendment of FASB Statement No. 115 (SFAS No. 159). SFAS No. 159 permits entities to choose, at specified election dates, to measure many financial instruments and certain other items at fair value that are not
currently required to be measured at fair value. Unrealized gains and losses shall be reported on items for which the fair value option has been elected in earnings at each subsequent reporting date. SFAS No. 159 became effective for fiscal
years beginning after November 15, 2007. On January 1, 2008, the Company adopted SFAS No. 159 and has currently not elected to measure any financial instruments or other items (not currently required to be measured at fair value) at
fair value.

In December 2007, the FASB issued SFAS No. 141 (revised 2007), Business Combinations (SFAS
No. 141(R)), which establishes principles and requirements for how the acquirer shall recognize and measure in its financial statements the identifiable assets acquired, liabilities assumed, any noncontrolling interest in the acquiree and
goodwill acquired in a business combination. SFAS No. 141(R) is effective for business combinations for which the acquisition date is on or after the beginning of the first annual reporting period beginning on or after December 15, 2008.
The Company does not expect the adoption of SFAS No. 141(R) to have material impact on its financial position and results of operations.

In December 2007, the FASB issued SFAS No. 160, Noncontrolling Interests in Consolidated Financial Statementsan Amendment of ARB No. 51 (SFAS No. 160), which establishes and expands
accounting and reporting standards for minority interests, which will be recharacterized as noncontrolling interests, in a subsidiary and the deconsolidation of a subsidiary. SFAS No. 160 is effective for business combinations for which the
acquisition date is on or after the beginning of the first annual reporting period beginning on or after December 15, 2008. This statement is effective for fiscal years beginning on or after December 15, 2008. The Company is currently
assessing the potential impact that the adoption of SFAS No. 160 will have on its financial position and results of operations.

In
March 2008, the FASB issued SFAS No. 161 Disclosures about Derivative Instruments and Hedging Activities (SFAS No. 161). SFAS No. 161 amends and expands the disclosure requirements of SFAS No. 133
with the intent to provide users of financial statements with an enhanced understanding of how derivative instruments and hedging activities affect an entitys financial position, financial performance and cash flows. These disclosure
requirements include a tabular summary of the fair values of derivative instruments and their gains and losses, disclosure of derivative features that are credit risk related to provide more information regarding an entitys liquidity and
cross-referencing within footnotes to make it easier for financial statement users to locate important information about derivative instruments. SFAS No. 161 is effective for financial statements issued for fiscal years and interim periods
beginning after November 15, 2008 with early application encouraged. The Company does not expect the adoption of SFAS No. 161 to have a material impact on the Company.



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BOSTON PROPERTIES LIMITED PARTNERSHIP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



In May 2008, the FASB issued FASB Staff Position (FSP) No. APB 14-1 Accounting for
Convertible Debt Instruments That May Be Settled in Cash upon Conversion (Including Partial Cash Settlement) (FSP No. APB 14-1) that requires the liability and equity components of convertible debt instruments that may be settled
in cash upon conversion (including partial cash settlement) to be separately accounted for in a manner that reflects the issuers nonconvertible debt borrowing rate. FSP No. APB 14-1 requires that the initial proceeds from the sale of the
Companys $862.5 million of 2.875% exchangeable senior notes due 2037, $450.0 million of 3.75% exchangeable senior notes due 2036 and $747.5 million of 3.625% exchangeable senior notes due 2014 be allocated between a liability component and an
equity component in a manner that reflects interest expense at the interest rate of similar nonconvertible debt. The resulting debt discount will be amortized over the period during which the debt is expected to be outstanding (i.e., through the
first optional redemption dates) as additional non-cash interest expense. Based on the Companys understanding of the application of FSP No. APB 14-1, this will result in an aggregate of approximately $0.15$0.16 per share (net of
incremental capitalized interest) of additional non-cash interest expense for fiscal 2008. Excluding the impact of capitalized interest, the additional non-cash interest expense will be approximately $0.19$0.20 per share for fiscal 2008, and
this amount (before netting) will increase in subsequent reporting periods through the first optional redemption dates as the debt accretes to its par value over the same period. FSP No. APB 14-1 is effective for fiscal years beginning after
December 15, 2008, and interim periods within those fiscal years. Early adoption is not permitted. Upon adoption, FSP No. APB 14-1 requires companies to retrospectively apply the requirements of the pronouncement to all periods presented.

In May 2008, the FASB issued SFAS No. 162, The Hierarchy of Generally Accepted Accounting Principles (SFAS
No. 162), which is intended to improve financing reporting by identifying a consistent framework or hierarchy for selecting accounting principles to be used in preparing financial statements of nongovernmental entities that are presented
in conformity with generally accepted accounting principles (GAAP) in the United States (the GAAP hierarchy). SFAS No. 162 is effective 60 days following the Securities and Exchange Commissions (SEC) approval of the
Public Company Accounting Oversight Board amendment to AU Section 411, The Meaning of Present Fairly in Conformity with Generally Accepted Accounting Principles. The Company does not expect the adoption of SFAS No. 162 to have
a material impact on the Company.

In June 2008, the FASB issued FSP EITF 03-06-1, Determining Whether Instruments Granted in
Share-Based Payment Transactions are Participating Securities (FSP EITF 03-06-1). FSP EITF 03-06-1 clarifies that unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether
paid or unpaid) are participating securities and shall be included in the computation of EPS pursuant to the two-class method. FSP EITF 03-06-1 is effective for financial statements issued for fiscal years beginning after December 15, 2008, and
interim periods within those fiscal years. All prior-period EPS data presented shall be adjusted retrospectively (including interim financial statements, summaries of earnings, and selected financial data) to conform with the provisions of the FSP.
Early application is not permitted. The Company does not expect the adoption of FSP EITF 03-06-1 to have a material impact on the Company.



|22. | Related Party Transactions
|--- | --------------------------

On October 26,
2005, the Company entered into an agreement with an entity owned by Mr. Zuckerman, Chairman of the Board of Directors of Boston Properties, Inc. Under the agreement, which was approved by the disinterested members of the Board of
Directors of Boston Properties, Inc., the Company renders project management services to such entity in exchange for a fee. The Company extended its services under a letter dated October 10, 2006. Under the agreement, as extended, the Company
earned $0, $80,000 and $57,000 during the years ended December 31, 2008, 2007 and 2006, respectively.



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BOSTON PROPERTIES LIMITED PARTNERSHIP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



A firm controlled by Mr. Raymond A. Ritcheys brother was paid aggregate leasing
commissions of approximately $2,219,000, $848,000 and $559,000 for the years ended December 31, 2008, 2007 and 2006, respectively, related to certain exclusive leasing arrangements for certain Northern Virginia properties. Mr. Ritchey is
an Executive Vice President of Boston Properties, Inc.

Mr. Martin Turchin, a member of the Board of Directors of Boston Properties,
Inc., is a non-executive/non-director Vice Chairman of CB Richard Ellis (CBRE). Through an arrangement with CBRE and its predecessor, Insignia/ESG, Inc. that has been in place since 1985, Mr. Turchin and Turchin &
Associates, an entity owned by Mr. Turchin (95%) and his son (5%), participate in brokerage activities for which CBRE is retained as leasing agent, some of which involve leases for space within buildings owned by the Company. Additionally,
Mr. Turchins son is employed by CBRE and works on transactions for which CBRE earns commission income from the Company. Mr. Turchins sons compensation from CBRE is in the form of salary and bonus, neither of which is
directly tied to CBREs transactions with the Company. For the years ended December 31, 2008, 2007 and 2006, Mr. Turchin, directly and through Turchin & Associates, received commission income of $138,000, $95,000 and $19,000,
respectively, from commissions earned by CBRE and its predecessor, Insignia/ESG, Inc., from the Company. Pursuant to its arrangement with CBRE, Turchin & Associates has confirmed to the Company that it is paid on the same basis with respect
to properties owned by the Company as it is with respect to properties owned by other clients of CBRE. Mr. Turchin does not participate in any discussions or other activities relating to the Companys contractual arrangements with CBRE
either in his capacity as a member of the Board of Directors of Boston Properties, Inc. or as a Vice Chairman of CBRE.

On June 30,
1998, the Company acquired from entities controlled by Mr. Alan B. Landis, a former director, a portfolio of properties known as the Carnegie Center Portfolio and Tower Center One and related operations and development rights
(collectively, the Carnegie Center Portfolio). In connection with the acquisition of the Carnegie Center Portfolio, the Company entered into a development agreement (the Development Agreement) with affiliates of
Mr. Landis providing for up to approximately 2,000,000 square feet of development in or adjacent to the Carnegie Center office complex. An affiliate of Mr. Landis was entitled to a purchase price for each parcel developed under the
Development Agreement calculated on the basis of $20 per rentable square foot of property developed. Another affiliate of Mr. Landis was eligible to earn a contingent payment for each developed property that achieves a stabilized return in
excess of a target annual return ranging between 10.5% and 11%. The Development Agreement also provided that upon negotiated terms and conditions, the Company and Mr. Landis would form a development company to provide development services for
these development projects and would share the expenses and profits, if any, of this new company. In addition, in connection with the acquisition of the Carnegie Center Portfolio, Mr. Landis became a director of Boston Properties, Inc. pursuant
to an Agreement Regarding Directorship, dated as of June 30, 1998, with Boston Properties, Inc. (the Directorship Agreement). Under the Directorship Agreement, Boston Properties, Inc. agreed to nominate Mr. Landis for
re-election as a director at each annual meeting of stockholders of Boston Properties, Inc. in a year in which his term expires, provided that specified conditions are met.

On October 21, 2004, the Company entered into an agreement (the 2004 Agreement) to modify several provisions of the Development
Agreement. Under the terms of the 2004 Agreement, the Company and affiliates of Mr. Landis amended the Development Agreement to limit the rights of Mr. Landis and his affiliates to participate in the development of properties under the
Development Agreement. Among other things, Mr. Landis agreed that (1) Mr. Landis and his affiliates will have no right to participate in any entity formed to acquire land parcels or the development company formed by the Company to
provide development services under the Development Agreement, (2) Mr. Landis will have no right or obligation to play a role in development activities engaged in by the development company formed by the Company under the Development
Agreement or receive compensation from the development company and (3) the affiliate of Mr. Landis will have no right to receive a



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



contingent payment for developed properties based on stabilized returns. In exchange, the Company (together with Boston Properties, Inc.) agreed to:



| |  |  | effective as of June 30, 1998, pay Mr. Landis $125,000 on January 1 of each year until the earlier of (A) January 1, 2018, (B) the
termination of the Development Agreement or (C) the date on which all development properties under the Development Agreement have been conveyed pursuant to the Development Agreement, with $750,000, representing payments of this annual amount
from 1998 to 2004, being paid upon execution of the 2004 Agreement; and
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | pay an affiliate of Mr. Landis, in connection with the development of land parcels acquired under the Development Agreement, an aggregate fixed amount of
$10.50 per rentable square foot of property developed (with a portion of this amount (i.e., $5.50) being subject to adjustment, in specified circumstances, based on future increases in the Consumer Price Index) in lieu of a contingent payment based
on stabilized returns, which payment could have been greater or less than $10.50 per rentable square foot of property developed.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

The Company also continues to be obligated to pay an affiliate of Mr. Landis the purchase price of $20 per rentable square foot of property developed for each land parcel acquired as provided in the original Development Agreement.
During the 20-year term of the Development Agreement, until such time, if any, as the Company elects to acquire a land parcel, an affiliate of Mr. Landis will remain responsible for all carrying costs associated with such land parcel. On
July 24, 2007, the Company acquired from Mr. Landis 701 Carnegie Center, a land parcel located in Princeton, New Jersey for a purchase price of approximately $3.1 million.

In addition, in connection with entering into the 2004 Agreement, Mr. Landis resigned as a director of Boston Properties, Inc. effective as of
May 11, 2005 and agreed that Boston Properties, Inc. had no future obligation to nominate Mr. Landis as a director of Boston Properties, Inc. under the Directorship Agreement or otherwise. Mr. Landis did not resign because of a
disagreement with Boston Properties, Inc. on any matter relating to its operations, policies or practices. Mitchell S. Landis, the Senior Vice President and Regional Manager of the Companys Princeton, New Jersey region, is the brother of Alan
B. Landis.

In accordance with Boston Properties, Inc.s 1997 Plan, and as approved by the Board of Directors of Boston Properties,
Inc., each non-employee director (other than one director beginning in 2009) has made an election to receive deferred stock units in lieu of cash fees. The deferred stock units will be settled in shares of common stock upon the cessation of such
directors service on the Board of Directors of Boston Properties, Inc. As a result of these elections, the aggregate cash fees otherwise payable to a non-employee director during a fiscal quarter are converted into a number of deferred stock
units equal to the aggregate cash fees divided by the last reported sales price of a share of Boston Properties, Inc.s common stock on the last trading of the applicable fiscal quarter. The deferred stock units are also credited with dividend
equivalents. At December 31, 2008 and 2007, Boston Properties, Inc. had outstanding 72,580 and 59,015 deferred stock units, respectively, with an aggregate value at issuance of approximately $4.1 million and $3.5 million, respectively, which
amounts are included in the accompanying Consolidated Balance Sheets.



|23. | Subsequent Events
|--- | -----------------

On January 5, 2009, the
Company paid $25.0 million in connection with the agreement entered into in May 2006 to redeem the outside members equity interests in the limited liability company that owns Citigroup Center.

On January 16, 2009, the Company acquired the development rights for the site at 17 Cambridge Center in Cambridge, Massachusetts for approximately
$11.4 million.



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)



On February 2, 2009, Boston Properties, Inc. issued 60,038 shares of restricted stock and the
Company issued 506,493 LTIP Units under the 1997 Plan to certain employees of the Company.

On February 6, 2009, the Company announced that it was suspending construction on its 1,000,000 square foot office building at 250 West 55thStreet in New York City as a result of its inability to conclude a lease transaction with a major law firm with which it had been negotiating over the last year. While the Company had reached agreement on financial terms with that firm,
they recently informed the Company that they could not proceed on those terms thereby rendering the project economically infeasible in todays environment. The Company expects the suspension of development will reduce its 2009 capitalized
interest and capitalized wages. These reductions will result in corresponding incremental increases to the Companys anticipated interest expense and general and administrative expense. The Company may also incur one-time costs related to its
one existing signed lease, possible write-offs of leasing commissions, arrangements in place with contractors and subcontractors for the project and other possible costs. There can be no assurance that the decision to suspend construction will not
have a material adverse effect on the Companys results of operations.



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|Item 9. | Changes in and Disagreements with Accountants on Accounting and Financial Disclosure
|------- | ------------------------------------------------------------------------------------

None.



|Item 9A. | Controls and Procedures
|-------- | -----------------------

As
of the end of the period covered by this report, an evaluation was carried out by the management of Boston Properties, Inc., with the participation of its Chief Executive Officer and Chief Financial Officer, of the effectiveness of our disclosure
controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934). Based upon that evaluation, the Chief Executive Officer and Chief Financial Officer of Boston Properties, Inc. concluded that these disclosure
controls and procedures were effective as of the end of the period covered by this report. In addition, no change in our internal control over financial reporting (as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934) occurred
during the fourth quarter of our fiscal year ended December 31, 2008 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

Managements Report on Internal Control over Financial Reporting is set forth on page 100 of this Annual Report on Form 10-K and is
incorporated herein by reference.



|Item 9B. | Other Information
|-------- | -----------------

None.



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PART III



|Item 10. | Directors, Executive Officers and Corporate Governance
|-------- | ------------------------------------------------------

We are managed by Boston Properties, Inc. in its capacity as our general partner. The information concerning Boston Properties, Inc.s directors and executive officers required by Item 10 will be included in
Boston Properties, Inc.s Proxy Statement to be filed relating to its 2009 Annual Meeting of Stockholders and is incorporated herein by reference.

Section 16(a) of the Exchange Act requires the executive officers and directors of Boston Properties, Inc., our general partner, and persons who own more than ten percent of a registered class our equity
securities to file reports of ownership and changes in ownership with the SEC and the New York Stock Exchange. Officers, directors and greater than ten percent beneficial owners are required by SEC regulations to furnish us with copies of all
Section 16(a) forms they file. To our knowledge, based solely on our review of the copies of such reports furnished to us and written representations that no other reports were required during the fiscal year ended December 31, 2008, all
Section 16(a) filing requirements applicable to the executive officers, directors and greater than ten percent beneficial owners of BPLP were satisfied.



|Item 11. | Executive Compensation
|-------- | ----------------------

We
are managed by Boston Properties, Inc., in its capacity as our general partner. The information required by Item 11 will be included in Boston Properties, Inc.s Proxy Statement to be filed relating to its 2009 Annual Meeting of
Stockholders and is incorporated herein by reference.



|Item 12. | Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
|-------- | ----------------------------------------------------------------------------------------------

Boston Properties, Inc. maintains the Second Amendment and Restatement of the Boston Properties, Inc. 1997 Stock Option and Incentive Plan and the Boston
Properties, Inc. 1999 Non-Qualified Employee Stock Purchase Plan. The following table summarizes Boston Properties, Inc.s equity compensation plans as of December 31, 2008.



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|                                                               |  |                                                                                         |     |  |                                                                           |       |     |                                                                                                                                         |          
|-------------------------------------------------------------- |  | --------------------------------------------------------------------------------------- | --- |  | ------------------------------------------------------------------------- | ----- | --- | --------------------------------------------------------------------------------------------------------------------------------------- | ---------
|                                                               |  | Equity Compensation Plan Information                                                   
|Plan category                                                  |  | Number of securities to beissued upon exercise ofoutstanding options,warrantsand
rights |     |  | Weighted-average exerciseprice of outstanding options,warrants and rights |       |     | Number of securities remainingavailable for future issuanceunder equity compensationplans (excluding
securitiesreflected in column (a))
|                                                               |  | (a)                                                                                     |     |  | (b)                                                                       |       |     | (c)                                                                                                                                    
|Equity compensation plans approved by security holders (1)     |  | 3,304,117                                                                               | (2) |  | $                                                                         | 34.23 | (2) |                                                                                                                                         | 2,489,545
|Equity compensation plans not approved by security holders (3) |  | N/A                                                                                     |     |  |                                                                           | N/A   |     |                                                                                                                                         | 164,092  
|                                                               |  |                                                                                         |     |  |                                                                           |       |     |                                                                                                                                         |          
|Total                                                          |  | 3,304,117                                                                               |     |  | $                                                                         | 34.23 |     |                                                                                                                                         | 2,653,637
|                                                               |  |                                                                                         |     |  |                                                                           |       |     |                                                                                                                                         |          



|(1) | Includes information related to Boston Properties, Inc.s 1997 Plan (See Note 18).
|--- | ----------------------------------------------------------------------------------

|(2) | Includes (a) 1,206,402 shares of common stock issuable upon the exercise of outstanding options, (b) 946,509 LTIP units that, upon the satisfaction of certain conditions,
are convertible into common units, which may then be presented to Boston Properties, Inc. for redemption and acquired by Boston Properties, Inc. for shares of common stock, (c) 1,080,938 2008 OPP Units and (d) 72,579 deferred stock units
which were granted pursuant to an election by each of Boston Properties, Inc.s non-employee directors to defer all cash compensation to be paid to such director and to receive his or her deferred cash compensation in shares of Boston
Properties, Inc.s common stock upon the directors retirement from its Board of Directors. Does not include 30,058 shares of restricted stock, as they have been reflected in its total shares outstanding. Because there is no exercise price
associated with LTIP Units, 2008 OPP Units or deferred stock units, such units are not included in the weighed-average exercise price calculation. On February 5, 2008, we granted 2008 OPP Units to officers and key employees. The 2008 OPP Units
are earned if Boston Properties, Inc. outperforms absolute and relative thresholds. Such thresholds were not met as of December 31, 2008.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | Includes information related to Boston Properties, Inc.s 1999 Non-Qualified Employee Stock Purchase Plan.
|--- | ----------------------------------------------------------------------------------------------------------

The 1999 Non-Qualified Employee Stock Purchase Plan (the ESPP)

The ESPP was adopted by the Board of Directors of Boston Properties, Inc. on October 29, 1998. The ESPP has not been approved by the shareholders of Boston Properties, Inc. The ESPP is available to all employees
that are employed on the first day of the purchase period. Under the ESPP, each eligible employee may purchase shares of Boston Properties, Inc.s common stock at semi-annual intervals each year at a purchase price equal to 85% of the average
closing prices of Boston Properties, Inc.s common stock on the New York Stock Exchange during the last ten business days of the purchase period. Each eligible employee may contribute no more than $10,000 per year to purchase Boston Properties,
Inc. common stock under the ESPP.

Additional information required by Item 12 will be included in Boston Properties, Inc.s Proxy
Statement to be filed relating to its 2009 Annual Meeting of Stockholders and is incorporated herein by reference.



|Item 13. | Certain Relationships and Related Transactions, and Director Independence
|-------- | -------------------------------------------------------------------------

The information required by Item 13 will be included in Boston Properties, Inc.s Proxy Statement to be filed relating to its 2009 Annual
Meeting of Stockholders and is incorporated herein by reference.



|Item 14. | Principal Accountant Fees and Services
|-------- | --------------------------------------

The information required by Item 14 will be included in Boston Properties, Inc.s Proxy Statement to be filed relating to its 2009 Annual Meeting of Stockholders and is incorporated herein by reference.



156



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Part IV



|Item 15. | Exhibits and Financial Statement Schedules
|-------- | ------------------------------------------

(a) Financial Statement Schedule



157



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Boston Properties Limited Partnership

Schedule 3Real Estate and Accumulated Depreciation

December 31, 2008

(dollars in thousands)

|                                |  |        |  |                        |  |              |         |          |   |                                         |  |   |                      |  |                         |         |                         |  |                                       |         |       |   |                         |  |                        |        |                         |   |        |  |   |           |  |   |         |  |                |  |    
|------------------------------- |  | ------ |  | ---------------------- |  | ------------ | ------- | -------- | - | --------------------------------------- |  | - | -------------------- |  | ----------------------- | ------- | ----------------------- |  | ------------------------------------- | ------- | ----- | - | ----------------------- |  | ---------------------- | ------ | ----------------------- | - | ------ |  | - | --------- |  | - | ------- |  | -------------- |  | ---
|Property Name                   |  | Type   |  | Location               |  | Encumbrances |         | Original |   | CostsCapitalizedSubsequenttoAcquisition |  |   | Land andImprovements |  | BuildingandImprovements |         | LandHeld forDevelopment |  | DevelopmentandConstructionin Progress |         | Total |   | AccumulatedDepreciation |  | Year(s)Built/Renovated |        | DepreciableLives(Years)
|                                |  |        |  | Land                   |  | Building     |         |          |   |                                         |  |   |                      |  |                        
|Embarcadero Center              |  | Office |  | San Francisco, CA      |  | $            | 375,000 |          | $ | 179,697                                 |  | $ | 847,410              |  | $                       | 194,954 |                         |  | $                                     | 180,417 |       | $ | 1,041,644               |  | $                      |       |                         | $ |       |  | $ | 1,222,061 |  | $ | 282,929 |  | 1970/1989      |  | (1)
|399 Park Avenue                 |  | Office |  | New York, NY           |  |              |        |          |   | 339,200                                 |  |   | 700,358              |  |                         | 15,611  |                         |  |                                       | 339,200 |       |   | 715,969                 |  |                        |       |                         |   |       |  |   | 1,055,169 |  |   | 111,978 |  | 1961           |  | (1)
|Prudential Center               |  | Office |  | Boston, MA             |  |              |        |          |   | 92,077                                  |  |   | 734,594              |  |                         | 202,653 |                         |  |                                       | 92,327  |       |   | 921,975                 |  |                        | 14,893 |                         |   | 129    |  |   | 1,029,324 |  |   | 238,373 |  | 1965/1993/2002 |  | (1)
|Citigroup Center                |  | Office |  | New York, NY           |  |              | 476,488 |          |   | 241,600                                 |  |   | 494,782              |  |                         | 130,359 |                         |  |                                       | 279,281 |       |   | 587,460                 |  |                        |       |                         |   |       |  |   | 866,741   |  |   | 106,290 |  | 1977/1997      |  | (1)
|Times Square Tower              |  | Office |  | New York, NY           |  |              |        |          |   | 165,413                                 |  |   | 380,438              |  |                         | 44,100  |                         |  |                                       | 162,235 |       |   | 427,716                 |  |                        |       |                         |   |       |  |   | 589,951   |  |   | 63,725  |  | 2004           |  | (1)
|Carnegie Center                 |  | Office |  | Princeton, NJ          |  |              | 57,300  |          |   | 101,772                                 |  |   | 349,089              |  |                         | 51,486  |                         |  |                                       | 95,396  |       |   | 390,713                 |  |                        | 1,702  |                         |   | 14,536 |  |   | 502,347   |  |   | 108,554 |  | 1983-1999      |  | (1)
|599 Lexington Avenue            |  | Office |  | New York, NY           |  |              | 750,000 |          |   | 81,040                                  |  |   | 100,507              |  |                         | 84,672  |                         |  |                                       | 81,040  |       |   | 185,179                 |  |                        |       |                         |   |       |  |   | 266,219   |  |   | 116,028 |  | 1986           |  | (1)
|Gateway Center                  |  | Office |  | South SanFrancisco, CA |  |              |        |          |   | 28,255                                  |  |   | 139,245              |  |                         | 38,970  |                         |  |                                       | 29,029  |       |   | 177,441                 |  |                        |       |                         |   |       |  |   | 206,470   |  |   | 44,237  |  | 1984/1986/2002 |  | (1)
|South of Market                 |  | Office |  | Reston, VA             |  |              | 183,125 |          |   | 13,603                                  |  |   | 163,894              |  |                         |        |                         |  |                                       | 13,603  |       |   | 163,894                 |  |                        |       |                         |   |       |  |   | 177,497   |  |   | 3,892   |  | 2008           |  | (1)
|Reservoir Place                 |  | Office |  | Waltham, MA            |  |              | 48,689  |          |   | 18,605                                  |  |   | 92,619               |  |                         | 23,539  |                         |  |                                       | 19,099  |       |   | 115,664                 |  |                        |       |                         |   |       |  |   | 134,763   |  |   | 36,592  |  | 1955/1987      |  | (1)
|Kingstowne Towne Center         |  | Office |  | Alexandria, VA         |  |              | 61,493  |          |   | 18,021                                  |  |   | 109,038              |  |                         | (116    | )                       |  |                                       | 18,021  |       |   | 108,922                 |  |                        |       |                         |   |       |  |   | 126,943   |  |   | 8,000   |  | 2003-2006      |  | (1)
|3200 Zanker Road                |  | Office |  | San Jose, CA           |  |              |        |          |   | 36,705                                  |  |   | 82,863               |  |                         | 6,389   |                         |  |                                       | 36,705  |       |   | 88,140                  |  |                        | 1,112  |                         |   |       |  |   | 125,957   |  |   | 6,865   |  | 1988           |  | (1)
|505 9th Street                  |  | Office |  | Washington, DC         |  |              | 130,000 |          |   | 38,885                                  |  |   | 83,719               |  |                         | 1,986   |                         |  |                                       | 38,885  |       |   | 85,705                  |  |                        |       |                         |   |       |  |   | 124,590   |  |   | 3,851   |  | 2007           |  | (1)
|1333 New Hampshire Avenue       |  | Office |  | Washington, DC         |  |              |        |          |   | 34,032                                  |  |   | 85,660               |  |                         | 1,481   |                         |  |                                       | 34,032  |       |   | 87,141                  |  |                        |       |                         |   |       |  |   | 121,173   |  |   | 17,374  |  | 1996           |  | (1)
|1330 Connecticut Avenue         |  | Office |  | Washington, DC         |  |              | 50,298  |          |   | 25,982                                  |  |   | 82,311               |  |                         | 10,811  |                         |  |                                       | 25,982  |       |   | 93,122                  |  |                        |       |                         |   |       |  |   | 119,104   |  |   | 13,263  |  | 1984           |  | (1)
|635 Massachusetts Avenue        |  | Office |  | Washington, DC         |  |              |        |          |   | 95,281                                  |  |   | 22,221               |  |                         | 15      |                         |  |                                       | 95,281  |       |   | 22,221                  |  |                        |       |                         |   | 15     |  |   | 117,517   |  |   | 1,170   |  | 1968/1992      |  | (1)
|Capital Gallery                 |  | Office |  | Washington, DC         |  |              |        |          |   | 4,725                                   |  |   | 29,560               |  |                         | 76,356  |                         |  |                                       | 6,128   |       |   | 104,513                 |  |                        |       |                         |   |       |  |   | 110,641   |  |   | 34,095  |  | 1981/2006      |  | (1)
|One Freedom Square              |  | Office |  | Reston, VA             |  |              | 73,641  |          |   | 9,929                                   |  |   | 84,504               |  |                         | 7,119   |                         |  |                                       | 9,883   |       |   | 91,669                  |  |                        |       |                         |   |       |  |   | 101,552   |  |   | 27,153  |  | 2000           |  | (1)
|Seven Cambridge Center          |  | Office |  | Cambridge, MA          |  |              |        |          |   | 3,457                                   |  |   | 97,136               |  |                         | 210     |                         |  |                                       | 3,457   |       |   | 97,346                  |  |                        |       |                         |   |       |  |   | 100,803   |  |   | 17,501  |  | 2006           |  | (1)
|Two Freedom Square              |  | Office |  | Reston, VA             |  |              |        |          |   | 13,930                                  |  |   | 77,739               |  |                         | 5,930   |                         |  |                                       | 13,866  |       |   | 83,733                  |  |                        |       |                         |   |       |  |   | 97,599    |  |   | 19,844  |  | 2001           |  | (1)
|One and Two Reston Overlook     |  | Office |  | Reston, VA             |  |              |        |          |   | 16,456                                  |  |   | 66,192               |  |                         | 4,434   |                         |  |                                       | 16,456  |       |   | 70,626                  |  |                        |       |                         |   |       |  |   | 87,082    |  |   | 20,320  |  | 1999           |  | (1)
|140 Kendrick Street             |  | Office |  | Needham, MA            |  |              | 55,486  |          |   | 18,095                                  |  |   | 66,905               |  |                         | 251     |                         |  |                                       | 18,095  |       |   | 67,156                  |  |                        |       |                         |   |       |  |   | 85,251    |  |   | 8,085   |  | 2000           |  | (1)
|Discovery Square                |  | Office |  | Reston, VA             |  |              |        |          |   | 11,198                                  |  |   | 71,782               |  |                         | 438     |                         |  |                                       | 11,146  |       |   | 72,272                  |  |                        |       |                         |   |       |  |   | 83,418    |  |   | 16,832  |  | 2001           |  | (1)
|12310 Sunrise Valley Drive      |  | Office |  | Reston, VA             |  |              |        |          |   | 9,367                                   |  |   | 67,431               |  |                         | 5,397   |                         |  |                                       | 10,542  |       |   | 71,653                  |  |                        |       |                         |   |       |  |   | 82,195    |  |   | 18,863  |  | 1987/1988      |  | (1)
|Waltham Weston Corporate Center |  | Office |  | Waltham, MA            |  |              |        |          |   | 10,385                                  |  |   | 60,694               |  |                         | 5,141   |                         |  |                                       | 10,350  |       |   | 65,870                  |  |                        |       |                         |   |       |  |   | 76,220    |  |   | 17,538  |  | 2003           |  | (1)
|Five Cambridge Center           |  | Office |  | Cambridge, MA          |  |              |        |          |   | 18,863                                  |  |   | 53,346               |  |                         | 3,973   |                         |  |                                       | 18,863  |       |   | 57,319                  |  |                        |       |                         |   |       |  |   | 76,182    |  |   | 4,917   |  | 1981/1996      |  | (1)



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|                                        |  |        |  |                  |  |              |  |          |  |                                         |  |        |                      |  |                         |  |                         |  |                                       |  |       |  |                         |  |                        |  |                         |  |    
|--------------------------------------- |  | ------ |  | ---------------- |  | ------------ |  | -------- |  | --------------------------------------- |  | ------ | -------------------- |  | ----------------------- |  | ----------------------- |  | ------------------------------------- |  | ----- |  | ----------------------- |  | ---------------------- |  | ----------------------- |  | ---
|Property Name                           |  | Type   |  | Location         |  | Encumbrances |  | Original |  | CostsCapitalizedSubsequenttoAcquisition |  |        | Land andImprovements |  | BuildingandImprovements |  | LandHeld forDevelopment |  | DevelopmentandConstructionin Progress |  | Total |  | AccumulatedDepreciation |  | Year(s)Built/Renovated |  | DepreciableLives(Years)
|                                        |  |        |  | Land             |  | Building     |  |          |  |                                         |  |        |                      |  |                        
|77 CityPoint                            |  | Office |  | Waltham, MA      |  |             |  | 13,847   |  | 59,831                                  |  |       |                      |  | 13,847                  |  | 59,831                  |  |                                      |  |      |  | 73,678                  |  | 360                    |  | 2008                    |  | (1)
|12300 Sunrise Valley Drive              |  | Office |  | Reston, VA       |  |             |  | 9,062    |  | 58,884                                  |  | 5,394  |                      |  | 10,235                  |  | 63,105                  |  |                                      |  |      |  | 73,340                  |  | 16,529                 |  | 1987/1988               |  | (1)
|North First Business Park               |  | Office |  | San Jose, CA     |  |             |  | 58,402   |  | 13,069                                  |  | 1,764  |                      |  | 23,371                  |  | 14,154                  |  | 35,710                                |  |      |  | 73,235                  |  | 1,637                  |  | 1981                    |  | (1)
|Four Cambridge Center                   |  | Office |  | Cambridge, MA    |  |             |  | 19,104   |  | 52,078                                  |  | 1,112  |                      |  | 19,104                  |  | 53,190                  |  |                                      |  |      |  | 72,294                  |  | 3,951                  |  | 1983/1998               |  | (1)
|230 CityPoint (formerly Prospect Place) |  | Office |  | Waltham, MA      |  |             |  | 13,189   |  | 49,823                                  |  | 7,178  |                      |  | 13,189                  |  | 57,001                  |  |                                      |  |      |  | 70,190                  |  | 6,699                  |  | 1992                    |  | (1)
|Reston Corporate Center                 |  | Office |  | Reston, VA       |  |             |  | 9,135    |  | 50,857                                  |  | 2,723  |                      |  | 9,496                   |  | 53,219                  |  |                                      |  |      |  | 62,715                  |  | 13,354                 |  | 1984                    |  | (1)
|New Dominion Technology Park, Bldg. Two |  | Office |  | Herndon, VA      |  | 63,000       |  | 5,584    |  | 51,868                                  |  | (73    | )                    |  | 5,574                   |  | 51,805                  |  |                                      |  |      |  | 57,379                  |  | 7,514                  |  | 2004                    |  | (1)
|191 Spring Street                       |  | Office |  | Lexington, MA    |  |             |  | 2,850    |  | 27,166                                  |  | 21,151 |                      |  | 2,850                   |  | 48,317                  |  |                                      |  |      |  | 51,167                  |  | 27,448                 |  | 1971/1995               |  | (1)
|303 Almaden Boulevard                   |  | Office |  | San Jose, CA     |  |             |  | 10,836   |  | 35,606                                  |  | 3,424  |                      |  | 10,836                  |  | 39,030                  |  |                                      |  |      |  | 49,866                  |  | 3,226                  |  | 1995                    |  | (1)
|New Dominion Technology Park, Bldg. One |  | Office |  | Herndon, VA      |  | 52,561       |  | 3,880    |  | 43,227                                  |  | 947    |                      |  | 3,880                   |  | 44,174                  |  |                                      |  |      |  | 48,054                  |  | 11,444                 |  | 2001                    |  | (1)
|1301 New York Avenue                    |  | Office |  | Washington, DC   |  | 21,627       |  | 9,250    |  | 18,750                                  |  | 18,027 |                      |  | 9,250                   |  | 36,777                  |  |                                      |  |      |  | 46,027                  |  | 11,737                 |  | 1983/1998               |  | (1)
|Sumner Square                           |  | Office |  | Washington, DC   |  | 26,242       |  | 624      |  | 28,745                                  |  | 12,788 |                      |  | 958                     |  | 41,199                  |  |                                      |  |      |  | 42,157                  |  | 14,303                 |  | 1985                    |  | (1)
|200 West Street                         |  | Office |  | Waltham, MA      |  |             |  | 16,148   |  | 24,983                                  |  | 801    |                      |  | 16,148                  |  | 25,784                  |  |                                      |  |      |  | 41,932                  |  | 9,016                  |  | 1999                    |  | (1)
|University Place                        |  | Office |  | Cambridge, MA    |  | 19,414       |  |         |  | 37,091                                  |  | 4,142  |                      |  | 27                      |  | 41,206                  |  |                                      |  |      |  | 41,233                  |  | 13,501                 |  | 1985                    |  | (1)
|Bedford Business Park                   |  | Office |  | Bedford, MA      |  |             |  | 534      |  | 3,403                                   |  | 35,938 |                      |  | 1,773                   |  | 38,102                  |  |                                      |  |      |  | 39,875                  |  | 17,934                 |  | 1980                    |  | (1)
|Quorum Office Park                      |  | Office |  | Chelmsford, MA   |  |             |  | 3,750    |  | 32,454                                  |  | 3,475  |                      |  | 4,762                   |  | 34,917                  |  |                                      |  |      |  | 39,679                  |  | 7,582                  |  | 2001                    |  | (1)
|2600 Tower Oaks Boulevard               |  | Office |  | Rockville, MD    |  |             |  | 4,243    |  | 31,125                                  |  | 2,522  |                      |  | 4,244                   |  | 33,646                  |  |                                      |  |      |  | 37,890                  |  | 10,243                 |  | 2001                    |  | (1)
|12290 Sunrise Valley Drive              |  | Office |  | Reston, VA       |  |             |  | 3,594    |  | 32,977                                  |  | (286   | )                    |  | 3,594                   |  | 32,691                  |  |                                      |  |      |  | 36,285                  |  | 3,656                  |  | 2006                    |  | (1)
|One Cambridge Center                    |  | Office |  | Cambridge, MA    |  |             |  | 134      |  | 25,110                                  |  | 8,877  |                      |  | 134                     |  | 33,987                  |  |                                      |  |      |  | 34,121                  |  | 18,446                 |  | 1987                    |  | (1)
|500 E Street                            |  | Office |  | Washington, DC   |  |             |  | 109      |  | 22,420                                  |  | 8,071  |                      |  | 1,569                   |  | 29,031                  |  |                                      |  |      |  | 30,600                  |  | 15,777                 |  | 1987                    |  | (1)
|Eight Cambridge Center                  |  | Office |  | Cambridge, MA    |  | 23,729       |  | 850      |  | 25,042                                  |  | 109    |                      |  | 822                     |  | 25,179                  |  |                                      |  |      |  | 26,001                  |  | 6,048                  |  | 1999                    |  | (1)
|10 and 20 Burlington Mall Road          |  | Office |  | Burlington, MA   |  | 19,024       |  | 930      |  | 6,928                                   |  | 11,951 |                      |  | 652                     |  | 19,157                  |  |                                      |  |      |  | 19,809                  |  | 11,141                 |  | 1984-1989/95-96         |  | (1)
|Ten Cambridge Center                    |  | Office |  | Cambridge, MA    |  | 30,593       |  | 1,299    |  | 12,943                                  |  | 4,003  |                      |  | 1,868                   |  | 16,377                  |  |                                      |  |      |  | 18,245                  |  | 8,174                  |  | 1990                    |  | (1)
|Montvale Center                         |  | Office |  | Gaithersburg, MD |  | 25,000       |  | 1,574    |  | 9,786                                   |  | 5,758  |                      |  | 2,399                   |  | 14,719                  |  |                                      |  |      |  | 17,118                  |  | 7,878                  |  | 1987                    |  | (1)
|40 Shattuck Road                        |  | Office |  | Andover, MA      |  |             |  | 709      |  | 14,740                                  |  | 1,275  |                      |  | 709                     |  | 16,015                  |  |                                      |  |      |  | 16,724                  |  | 3,757                  |  | 2001                    |  | (1)
|201 Spring Street                       |  | Office |  | Lexington, MA    |  |             |  | 2,849    |  | 15,303                                  |  | (1,440 | )                    |  | 2,849                   |  | 13,863                  |  |                                      |  |      |  | 16,712                  |  | 3,609                  |  | 1997                    |  | (1)
|6601 & 6605 Springfield Center Drive    |  | Office |  | Springfield, VA  |  |             |  | 14,041   |  | 2,375                                   |  | 19     |                      |  | 13,866                  |  | 2,375                   |  | 194                                   |  |      |  | 16,435                  |  | 944                    |  | 1990                    |  | (1)
|Lexington Office Park                   |  | Office |  | Lexington, MA    |  |             |  | 998      |  | 1,426                                   |  | 13,444 |                      |  | 1,073                   |  | 14,795                  |  |                                      |  |      |  | 15,868                  |  | 8,828                  |  | 1982                    |  | (1)
|Three Cambridge Center                  |  | Office |  | Cambridge, MA    |  |             |  | 174      |  | 12,200                                  |  | 3,255  |                      |  | 174                     |  | 15,455                  |  |                                      |  |      |  | 15,629                  |  | 8,491                  |  | 1987                    |  | (1)
|103 4th Avenue                          |  | Office |  | Waltham, MA      |  |             |  | 11,911   |  | 2,507                                   |  |       |                      |  | 11,911                  |  | 2,507                   |  |                                      |  |      |  | 14,418                  |  | 1,283                  |  | 1961                    |  | (1)



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|                                         |  |        |  |                 |  |              |  |          |  |                                         |  |                      |  |                         |  |                         |  |                                       |  |       |  |                         |  |                        |  |                         |  |    
|---------------------------------------- |  | ------ |  | --------------- |  | ------------ |  | -------- |  | --------------------------------------- |  | -------------------- |  | ----------------------- |  | ----------------------- |  | ------------------------------------- |  | ----- |  | ----------------------- |  | ---------------------- |  | ----------------------- |  | ---
|Property Name                            |  | Type   |  | Location        |  | Encumbrances |  | Original |  | CostsCapitalizedSubsequenttoAcquisition |  | Land andImprovements |  | BuildingandImprovements |  | LandHeld forDevelopment |  | DevelopmentandConstructionin Progress |  | Total |  | AccumulatedDepreciation |  | Year(s)Built/Renovated |  | DepreciableLives(Years)
|                                         |  |        |  | Land            |  | Building     |  |          |  |                                         |  |                      |  |                         | 
|92-100 Hayden Avenue                     |  | Office |  | Lexington, MA   |  |             |  | 594      |  | 6,748                                   |  | 5,947                |  | 619                     |  | 12,670                  |  |                                      |  |      |  | 13,289                  |  | 6,137                  |  | 1985                    |  | (1)
|181 Spring Street                        |  | Office |  | Lexington, MA   |  |             |  | 1,066    |  | 9,520                                   |  | 2,645                |  | 1,066                   |  | 12,165                  |  |                                      |  |      |  | 13,231                  |  | 3,301                  |  | 1999                    |  | (1)
|91 Hartwell Avenue                       |  | Office |  | Lexington, MA   |  | 15,565       |  | 784      |  | 6,464                                   |  | 2,864                |  | 784                     |  | 9,328                   |  |                                      |  |      |  | 10,112                  |  | 5,424                  |  | 1985                    |  | (1)
|Waltham Office Center                    |  | Office |  | Waltham, MA     |  |             |  | 422      |  | 2,719                                   |  | 6,955                |  | 425                     |  | 7,957                   |  | 1,714                                 |  |      |  | 10,096                  |  | 5,762                  |  | 1968-1970/87-88         |  | (1)
|7501 Boston Boulevard, Building Seven    |  | Office |  | Springfield, VA |  |             |  | 665      |  | 9,273                                   |  | 39                   |  | 665                     |  | 9,312                   |  |                                      |  |      |  | 9,977                   |  | 2,654                  |  | 1997                    |  | (1)
|195 West Street                          |  | Office |  | Waltham, MA     |  |             |  | 1,611    |  | 6,652                                   |  | 1,356                |  | 1,611                   |  | 8,008                   |  |                                      |  |      |  | 9,619                   |  | 4,063                  |  | 1990                    |  | (1)
|33 Hayden Avenue                         |  | Office |  | Lexington, MA   |  |             |  | 266      |  | 3,234                                   |  | 5,405                |  | 266                     |  | 8,639                   |  |                                      |  |      |  | 8,905                   |  | 4,933                  |  | 1979                    |  | (1)
|Eleven Cambridge Center                  |  | Office |  | Cambridge, MA   |  |             |  | 121      |  | 5,535                                   |  | 3,141                |  | 121                     |  | 8,676                   |  |                                      |  |      |  | 8,797                   |  | 5,122                  |  | 1984                    |  | (1)
|7450 Boston Boulevard, Building Three    |  | Office |  | Springfield, VA |  |             |  | 1,165    |  | 4,681                                   |  | 1,435                |  | 1,327                   |  | 5,954                   |  |                                      |  |      |  | 7,281                   |  | 1,971                  |  | 1987                    |  | (1)
|8000 Grainger Court, Building Five       |  | Office |  | Springfield, VA |  |             |  | 366      |  | 4,282                                   |  | 2,292                |  | 453                     |  | 6,487                   |  |                                      |  |      |  | 6,940                   |  | 3,841                  |  | 1984                    |  | (1)
|7435 Boston Boulevard, Building One      |  | Office |  | Springfield, VA |  |             |  | 392      |  | 3,822                                   |  | 2,408                |  | 486                     |  | 6,136                   |  |                                      |  |      |  | 6,622                   |  | 3,857                  |  | 1982                    |  | (1)
|7300 Boston Boulevard, Building Thirteen |  | Office |  | Springfield, VA |  |             |  | 608      |  | 4,773                                   |  |                     |  | 608                     |  | 4,773                   |  |                                      |  |      |  | 5,381                   |  | 2,162                  |  | 2002                    |  | (1)
|7601 Boston Boulevard, Building Eight    |  | Office |  | Springfield, VA |  |             |  | 200      |  | 878                                     |  | 4,182                |  | 378                     |  | 4,882                   |  |                                      |  |      |  | 5,260                   |  | 2,714                  |  | 1986                    |  | (1)
|Fourteen Cambridge Center                |  | Office |  | Cambridge, MA   |  |             |  | 110      |  | 4,483                                   |  | 569                  |  | 110                     |  | 5,052                   |  |                                      |  |      |  | 5,162                   |  | 3,078                  |  | 1983                    |  | (1)
|7500 Boston Boulevard, Building Six      |  | Office |  | Springfield, VA |  |             |  | 138      |  | 3,749                                   |  | 1,188                |  | 273                     |  | 4,802                   |  |                                      |  |      |  | 5,075                   |  | 3,087                  |  | 1985                    |  | (1)
|8000 Corporate Court, Building Eleven    |  | Office |  | Springfield, VA |  |             |  | 136      |  | 3,071                                   |  | 971                  |  | 687                     |  | 3,491                   |  |                                      |  |      |  | 4,178                   |  | 1,691                  |  | 1989                    |  | (1)
|7375 Boston Boulevard, Building Ten      |  | Office |  | Springfield, VA |  |             |  | 23       |  | 2,685                                   |  | 950                  |  | 47                      |  | 3,611                   |  |                                      |  |      |  | 3,658                   |  | 1,825                  |  | 1988                    |  | (1)
|7374 Boston Boulevard, Building Four     |  | Office |  | Springfield, VA |  |             |  | 241      |  | 1,605                                   |  | 1,277                |  | 303                     |  | 2,820                   |  |                                      |  |      |  | 3,123                   |  | 1,544                  |  | 1984                    |  | (1)
|7451 Boston Boulevard, Building Two      |  | Office |  | Springfield, VA |  |             |  | 249      |  | 1,542                                   |  | 1,000                |  | 535                     |  | 2,256                   |  |                                      |  |      |  | 2,791                   |  | 1,828                  |  | 1982                    |  | (1)
|32 Hartwell Avenue                       |  | Office |  | Lexington, MA   |  |             |  | 168      |  | 1,943                                   |  | 660                  |  | 168                     |  | 2,603                   |  |                                      |  |      |  | 2,771                   |  | 2,282                  |  | 1968-1979/1987          |  | (1)
|164 Lexington Road                       |  | Office |  | Billerica, MA   |  |             |  | 592      |  | 1,370                                   |  | 212                  |  | 592                     |  | 1,582                   |  |                                      |  |      |  | 2,174                   |  | 568                    |  | 1982                    |  | (1)
|17 Hartwell Avenue                       |  | Office |  | Lexington, MA   |  |             |  | 26       |  | 150                                     |  | 1,216                |  | 26                      |  | 1,366                   |  |                                      |  |      |  | 1,392                   |  | 810                    |  | 1968                    |  | (1)
|Cambridge Center Marriott                |  | Hotel  |  | Cambridge, MA   |  |             |  | 478      |  | 37,918                                  |  | 22,517               |  | 478                     |  | 60,435                  |  |                                      |  |      |  | 60,913                  |  | 30,214                 |  | 1986                    |  | (1)
|Cambridge Center East Garage             |  | Garage |  | Cambridge, MA   |  |             |  |         |  | 35,035                                  |  | 954                  |  |                        |  | 35,989                  |  |                                      |  |      |  | 35,989                  |  | 1,857                  |  | 1984                    |  | (1)
|Cambridge Center West Garage             |  | Garage |  | Cambridge, MA   |  |             |  | 1,256    |  | 15,697                                  |  |                     |  | 1,256                   |  | 15,697                  |  |                                      |  |      |  | 16,953                  |  | 1,268                  |  | 2006                    |  | (1)
|Cambridge Center North Garage            |  | Garage |  | Cambridge, MA   |  |             |  | 1,163    |  | 11,633                                  |  | 1,027                |  | 1,163                   |  | 12,660                  |  |                                      |  |      |  | 13,823                  |  | 6,012                  |  | 1990                    |  | (1)



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|                                   |  |             |  |                  |  |              |           |          |   |                                         |  |                      |           |                         |   |                         |  |                                       |           |       |   |                         |  |                        |         |                         |   |         |  |   |            |  |   |           |  |         |  |    
|---------------------------------- |  | ----------- |  | ---------------- |  | ------------ | --------- | -------- | - | --------------------------------------- |  | -------------------- | --------- | ----------------------- | - | ----------------------- |  | ------------------------------------- | --------- | ----- | - | ----------------------- |  | ---------------------- | ------- | ----------------------- | - | ------- |  | - | ---------- |  | - | --------- |  | ------- |  | ---
|Property Name                      |  | Type        |  | Location         |  | Encumbrances |           | Original |   | CostsCapitalizedSubsequenttoAcquisition |  | Land andImprovements |           | BuildingandImprovements |   | LandHeld forDevelopment |  | DevelopmentandConstructionin Progress |           | Total |   | AccumulatedDepreciation |  | Year(s)Built/Renovated |         | DepreciableLives(Years)
|                                   |  |             |  | Land             |  | Building     |           |          |   |                                         |  |                      |           |                         |  
|250 West 55th Street               |  | Development |  | New York, NY     |  |              |          |          |   |                                        |  |                      |          |                         |   | 411,619                 |  |                                       |          |       |   |                        |  |                        |        |                         |   | 411,619 |  |   | 411,619    |  |   |          |  | Various |  | N/A
|280 Congress Street (Russia Wharf) |  | Development |  | Boston, MA       |  |              |          |          |   |                                        |  |                      |          |                         |   | 207,358                 |  |                                       |          |       |   |                        |  |                        |        |                         |   | 207,358 |  |   | 207,358    |  |   |          |  | Various |  | N/A
|Democracy Tower                    |  | Development |  | Reston, VA       |  |              | 30,674    |          |   |                                        |  |                      |          |                         |   | 51,481                  |  |                                       |          |       |   |                        |  |                        |        |                         |   | 51,481  |  |   | 51,481     |  |   |          |  | Various |  | N/A
|One Preserve Parkway               |  | Development |  | Rockville, MD    |  |              |          |          |   |                                        |  |                      |          |                         |   | 46,385                  |  |                                       | 878       |       |   | 9,300                   |  |                        |        |                         |   | 36,207  |  |   | 46,385     |  |   | 279       |  | Various |  | N/A
|Wisconsin Place                    |  | Development |  | Chevy Chase, MD  |  |              | 71,693    |          |   |                                        |  |                      |          |                         |   | 43,775                  |  |                                       |          |       |   |                        |  |                        |        |                         |   | 43,775  |  |   | 43,775     |  |   |          |  | Various |  | N/A
|2200 Pennsylvania Avenue           |  | Development |  | Washington, DC   |  |              |          |          |   |                                        |  |                      |          |                         |   | 36,781                  |  |                                       |          |       |   |                        |  |                        |        |                         |   | 36,781  |  |   | 36,781     |  |   |          |  | Various |  | N/A
|Weston Corporate Center            |  | Development |  | Weston, MA       |  |              |          |          |   |                                        |  |                      |          |                         |   | 28,094                  |  |                                       |          |       |   |                        |  |                        |        |                         |   | 28,094  |  |   | 28,094     |  |   |          |  | Various |  | N/A
|Plaza at Almaden                   |  | Land        |  | San Jose, CA     |  |              |          |          |   |                                        |  |                      |          |                         |   | 32,675                  |  |                                       |          |       |   |                        |  |                        | 32,675  |                         |   |        |  |   | 32,675     |  |   |          |  | Various |  | N/A
|Springfield Metro Center           |  | Land        |  | Springfield, VA  |  |              |          |          |   |                                        |  |                      |          |                         |   | 28,317                  |  |                                       |          |       |   |                        |  |                        | 28,317  |                         |   |        |  |   | 28,317     |  |   |          |  | Various |  | N/A
|Tower Oaks Master Plan             |  | Land        |  | Rockville, MD    |  |              |          |          |   |                                        |  |                      |          |                         |   | 27,976                  |  |                                       |          |       |   |                        |  |                        | 27,976  |                         |   |        |  |   | 27,976     |  |   |          |  | Various |  | N/A
|Prospect Hill                      |  | Land        |  | Waltham, MA      |  |              |          |          |   |                                        |  |                      |          |                         |   | 23,448                  |  |                                       |          |       |   |                        |  |                        | 23,448  |                         |   |        |  |   | 23,448     |  |   |          |  | Various |  | N/A
|Washingtonian North                |  | Land        |  | Gaithersburg, MD |  |              |          |          |   |                                        |  |                      |          |                         |   | 17,603                  |  |                                       |          |       |   |                        |  |                        | 17,603  |                         |   |        |  |   | 17,603     |  |   |          |  | Various |  | N/A
|Reston Eastgate                    |  | Land        |  | Reston, VA       |  |              |          |          |   |                                        |  |                      |          |                         |   | 9,239                   |  |                                       |          |       |   |                        |  |                        | 9,239   |                         |   |        |  |   | 9,239      |  |   |          |  | Various |  | N/A
|Reston Gateway                     |  | Land        |  | Reston, VA       |  |              |          |          |   |                                        |  |                      |          |                         |   | 9,231                   |  |                                       |          |       |   |                        |  |                        | 9,231   |                         |   |        |  |   | 9,231      |  |   |          |  | Various |  | N/A
|Crane Meadow                       |  | Land        |  | Marlborough, MA  |  |              |          |          |   |                                        |  |                      |          |                         |   | 8,717                   |  |                                       |          |       |   |                        |  |                        | 8,717   |                         |   |        |  |   | 8,717      |  |   |          |  | Various |  | N/A
|Broad Run Business Park            |  | Land        |  | Loudon County,VA |  |              |          |          |   |                                        |  |                      |          |                         |   | 7,337                   |  |                                       | 1,621     |       |   |                        |  |                        | 5,716   |                         |   |        |  |   | 7,337      |  |   |          |  | Various |  | N/A
|Cambridge Master Plan              |  | Land        |  | Cambridge, MA    |  |              |          |          |   |                                        |  |                      |          |                         |   | 5,137                   |  |                                       |          |       |   | 128                     |  |                        | 5,009   |                         |   |        |  |   | 5,137      |  |   |          |  | Various |  | N/A
|30 Shattuck Road                   |  | Land        |  | Andover, MA      |  |              |          |          |   |                                        |  |                      |          |                         |   | 1,139                   |  |                                       |          |       |   |                        |  |                        | 1,139   |                         |   |        |  |   | 1,139      |  |   |          |  | Various |  | N/A
|                                   |  |             |  |                  |  |              |           |          |   |                                         |  |                      |           |                         |   |                         |  |                                       |           |       |   |                         |  |                        |         |                         |   |         |  |   |            |  |   |           |  |         |  |    
|                                   |  |             |  |                  |  | $            | 2,660,642 |          | $ | 1,859,023                               |  | $                    | 6,136,216 |                         | $ | 2,160,030               |  | $                                     | 1,867,429 |       | $ | 7,233,450               |  | $                      | 224,395 |                         | $ | 829,995 |  | $ | 10,155,269 |  | $ | 1,731,063 |  |         |  |    
|                                   |  |             |  |                  |  |              |           |          |   |                                         |  |                      |           |                         |   |                         |  |                                       |           |       |   |                         |  |                        |         |                         |   |         |  |   |            |  |   |           |  |         |  |    



|The | aggregate cost and accumulated depreciation for tax purposes was approximately $11.0 billion and $1.7 billion, respectively.
|--- | ----------------------------------------------------------------------------------------------------------------------------



|(1) | Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.
|--- | ------------------------------------------------------------------------------------------------------------------------



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Boston Properties Limited Partnership

Real Estate and Accumulated Depreciation

December 31, 2008

(dollars in thousands)

A summary of
activity for real estate and accumulated depreciation is as follows:

|                                         |  |      |            |   |      |   |           |      |  |   |           |  
|---------------------------------------- |  | ---- | ---------- | - | ---- | - | --------- | ---- |  | - | --------- | -
|                                         |  | 2008 |            |   | 2007 |   |           | 2006 | 
|Real Estate:                             |  |      |            |   |      |   |           |      |  |   |           |  
|Balance at the beginning of the year     |  | $    | 9,810,916  |   |      | $ | 9,226,711 |      |  | $ | 8,977,413 |  
|Additions to/improvements of real estate |  |      | 594,589    |   |      |   | 1,313,962 |      |  |   | 678,667   |  
|Assets sold/written-off                  |  |      | (250,236   | ) |      |   | (729,757  | )    |  |   | (429,369  | )
|                                         |  |      |            |   |      |   |           |      |  |   |           |  
|Balance at the end of the year           |  | $    | 10,155,269 |   |      | $ | 9,810,916 |      |  | $ | 9,226,711 |  
|                                         |  |      |            |   |      |   |           |      |  |   |           |  
|Accumulated Depreciation:                |  |      |            |   |      |   |           |      |  |   |           |  
|Balance at the beginning of the year     |  | $    | 1,503,283  |   |      | $ | 1,406,407 |      |  | $ | 1,244,031 |  
|Depreciation expense                     |  |      | 250,764    |   |      |   | 237,296   |      |  |   | 232,732   |  
|Assets sold/written-off                  |  |      | (22,984    | ) |      |   | (140,420  | )    |  |   | (70,356   | )
|                                         |  |      |            |   |      |   |           |      |  |   |           |  
|Balance at the end of the year           |  | $    | 1,731,063  |   |      | $ | 1,503,283 |      |  | $ | 1,406,407 |  
|                                         |  |      |            |   |      |   |           |      |  |   |           |  



|Note: | Real Estate and Accumulated Depreciation amounts do not include Furniture, Fixtures and Equipment.
|----- | --------------------------------------------------------------------------------------------------



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(b) Exhibits



|     |  |                                                                                                                                                                                                                                                                                                                                                                                    
|---- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|3.1  |  | Form of Amended and Restated Certificate of Incorporation of Boston Properties, Inc. (Incorporated by reference to Exhibit 3.1 to Boston Properties, Inc.s Registration Statement on Form
S-11, File No. 333-25279.)                                                                                                                                                              
|     | 
|3.2  |  | Amended and Restated Certificate of Designations of Series E Junior Participating Cumulative Preferred Stock of Boston Properties, Inc. (Incorporated by reference to Exhibit 3.1 to Boston
Properties, Inc.s Current Report on Form 8-K filed on June 18, 2007.)                                                                                                                 
|     | 
|3.3  |  | Second Amended and Restated Bylaws of Boston Properties, Inc. (Incorporated by reference to Exhibit 3.1 to Boston Properties, Inc.s Current Report on Form 8-K filed on October 24,
2008.)                                                                                                                                                                                        
|     | 
|4.1  |  | Shareholder Rights Agreement, dated as of June 18, 2007, between Boston Properties, Inc. and Computershare Trust Company, N.A., as Rights Agent. (Incorporated by reference to Exhibit 4.1 to
Boston Properties, Inc.s Current Report on Form 8-K filed on June 18, 2007.)                                                                                                        
|     | 
|4.2  |  | Form of Certificate of Designations for Series A Preferred Stock. (Incorporated by reference to Exhibit 99.26 to Boston Properties, Inc.s Current Report on Form 8-K filed on November
25, 1998.)                                                                                                                                                                                 
|     | 
|4.3  |  | Form of Common Stock Certificate. (Incorporated by reference to Exhibit 4.3 to Boston Properties, Inc.s Registration Statement on Form S-11, File No. 333-25279.)                                                                                                                                                                                                                 
|     | 
|4.4  |  | Indenture, dated as of December 13, 2002, by and between Boston Properties Limited Partnership and The Bank of New York, as Trustee. (Incorporated by reference to Exhibit 4.1 to Boston
Properties, Inc.s Current Report on Form 8-K/A filed on December 13, 2002.)                                                                                                              
|     | 
|4.5  |  | Supplemental Indenture No. 1, dated as of December 13, 2002, by and between Boston Properties Limited Partnership and The Bank of New York, as Trustee, including a form of the 6.25% Senior
Note due 2013. (Incorporated by reference to Exhibit 4.2 to Boston Properties, Inc.s Current Report on Form 8-K/A filed on December 13, 2002.)                                       
|     | 
|4.6  |  | Supplemental Indenture No. 2, dated as of January 17, 2003, by and between Boston Properties Limited Partnership and The Bank of New York, as Trustee, including a form of the 6.25% Senior
Note due 2013. (Incorporated by reference to Exhibit 4.1 to Boston Properties, Inc.s Current Report on Form 8-K filed on January 23, 2003.)                                           
|     | 
|4.7  |  | Supplemental Indenture No. 3, dated as of March 18, 2003, by and between Boston Properties Limited Partnership and The Bank of New York, as Trustee, including a form of the 5.625% Senior Note
due 2015. (Incorporated by reference to Exhibit 4.6 to Boston Properties Limited Partnerships Amendment No. 3 to Form 10 filed on May 13, 2003.)                                  
|     | 
|4.8  |  | Supplemental Indenture No. 4, dated as of May 22, 2003, by and between Boston Properties Limited Partnership and The Bank of New York, as Trustee, including a form of the 5.00% Senior Note
due 2015. (Incorporated by reference to Exhibit 4.2 to Boston Properties Limited Partnerships Form S-4 filed on June 13, 2003, File No. 333-106127.)                                 
|     | 
|4.9  |  | Supplemental Indenture No. 5, dated as of April 6, 2006, by and between Boston Properties Limited Partnership and The Bank of New York Trust Company, N.A., as Trustee, including a form of the
3.75% Exchangeable Senior Note due 2036. (Incorporated by reference to Exhibit 4.1 to Boston Properties, Inc.s Quarterly Report on Form 10-Q filed on May 10, 2006.)              
|     | 
|4.10 |  | Supplemental Indenture No. 6, dated February 6, 2007, by and between Boston Properties Limited Partnership and The Bank of New York Trust Company, N.A., as Trustee, including a form
of the 2.875% Exchangeable Senior Note due 2037. (Incorporated by reference to Exhibit 4.1 to Current Report on Form 8-K of Boston Properties Limited Partnership filed on February 6, 2007.)



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|       |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|------ |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|4.11   |  | Supplemental Indenture No. 7, dated as of August 19, 2008, between the Company and the Trustee, including a form of the 3.625% Exchangeable Senior Note due 2014. (Incorporated by
reference to Exhibit 4.1 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on August 20, 2008.)                                                                                                                                                                    
|       | 
|4.12   |  | Registration Rights Agreement, dated as of February 6, 2007, among Boston Properties Limited Partnership, Boston Properties, Inc., JP Morgan Securities Inc. and Morgan Stanley &
Co. Incorporated. (Incorporated by reference to Exhibit 4.3 to the Current Report on Form 8-K of Boston Properties Limited Partnership filed on February 6, 2007.)                                                                                                                                 
|       | 
|4.13   |  | Registration Rights Agreement, dated as of August 19, 2008, among the Company, Boston Properties, Inc., JP Morgan Securities Inc., Morgan Stanley & Co. Incorporated, Banc of America
Securities LLC, Deutsche Bank Securities Inc. and Citigroup Global Markets Inc., as the representatives of the initial purchasers of the Notes. (Incorporated by reference to Exhibit 4.3 to the Current Report on Form 8-K of Boston Properties Limited
Partnership filed on August 20, 2008.)
|       | 
|10.1   |  | Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership, dated as of June 29, 1998. (Incorporated by reference to Exhibit 99.1 to Boston
Properties, Inc.s Current Report on Form 8-K filed on July 15, 1998.)                                                                                                                                                                                                                        
|       | 
|10.2   |  | Certificate of Designations for the Series Two Preferred Units, dated November 12, 1998, constituting an amendment to the Second Amended and Restated Agreement of Limited Partnership of
Boston Properties Limited Partnership. (Incorporated by reference to Exhibit 99.24 to Boston Properties, Inc.s Current Report on Form 8-K filed on November 25, 1998.)                                                                                                                    
|       | 
|10.3*  |  | Forty-Seventh Amendment to the Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership, dated as of April 11, 2003, by Boston Properties, Inc.,
as general partner. (Incorporated by reference to Exhibit 10.1 to Boston Properties, Inc.s Quarterly Report on Form 10-Q filed on August 14, 2003.)                                                                                                                                   
|       | 
|10.4*  |  | Seventy-Seventh Amendment to the Second Amended and Restated Agreement of Limited Partnership of Boston Properties Limited Partnership, dated as of January 24, 2008, by Boston Properties,
Inc., as general partner. (Incorporated by reference to Exhibit 10.3 to Boston Properties, Inc.s Current Report on Form 8-K filed on January 29, 2008.)                                                                                                                                 
|       | 
|10.5*  |  | Second Amendment and Restatement of Boston Properties, Inc. 1997 Stock Option and Incentive Plan. (Incorporated by reference to Exhibit A to Boston Properties, Inc.s Proxy Statement on
Schedule 14A filed on April 6, 2007.)                                                                                                                                                                                                                                                      
|       | 
|10.6*  |  | Form of 2008 Outperformance Award Agreement. (Incorporated by reference to Exhibit 10.1 to Boston Properties, Inc.s Current Report on Form 8-K filed on January 29,
2008.)                                                                                                                                                                                                                                                                                                          
|       | 
|10.7*  |  | Boston Properties, Inc. 1999 Non-Qualified Employee Stock Purchase Plan. (Incorporated by reference to Exhibit 10.59 to Boston Properties, Inc.s Annual Report on Form 10-K filed on
March 15, 2005.)                                                                                                                                                                                                                                                                               
|       | 
|10.8*  |  | First Amendment to the Boston Properties, Inc. 1999 Non-Qualified Employee Stock Purchase Plan. (Incorporated by reference to Exhibit 10.60 to Boston Properties, Inc.s Annual Report on
Form 10-K filed on March 15, 2005.)                                                                                                                                                                                                                                                        
|       | 
|10.9*  |  | Second Amendment to the Boston Properties, Inc. 1999 Non-Qualified Employee Stock Purchase Plan. (Incorporated by reference to Exhibit 10.61 to Boston Properties, Inc.s Annual Report on
Form 10-K filed on March 15, 2005.)                                                                                                                                                                                                                                                       
|       | 
|10.10* |  | Boston Properties Deferred Compensation Plan, Amended and Restated Effective as of January 1, 2009. (Incorporated by reference to Exhibit 10.10 to Boston Properties, Inc.s Annual
Report on Form 10-K filed on March 2, 2009.)                                                                                                                                                                                                                                                     
|       | 
|10.11* |  | Employment Agreement by and between Mortimer B. Zuckerman and Boston Properties, Inc. dated as of January 17, 2003. (Incorporated by reference to Exhibit 10.7 to Boston Properties,
Inc.s Annual Report on Form 10-K filed on February 27, 2003.)                                                                                                                                                                                                                                  



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|       |  |                                                                                                                                                                                                                                                                                               
|------ |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|10.12* |  | First Amendment to Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Mortimer B. Zuckerman. (Incorporated by reference to Exhibit 10.1 to Boston
Properties, Inc.s Quarterly Report on Form 10-Q filed on November 9, 2007.)                    
|       | 
|10.13* |  | Second Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Mortimer B. Zuckerman. (Incorporated by reference to Exhibit 10.13 to
Boston Properties, Inc.s Annual Report on Form 10-K filed on March 2, 2009.)                       
|       | 
|10.14* |  | Amended and Restated Employment Agreement by and between Edward H. Linde and Boston Properties, Inc. dated as of November 29, 2002. (Incorporated by reference to Exhibit 10.8 to Boston
Properties, Inc.s Annual Report on Form 10-K filed on February 27, 2003.)                           
|       | 
|10.15* |  | First Amendment to Amended and Restated Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Edward H. Linde. (Incorporated by reference to Exhibit
10.2 to Boston Properties, Inc.s Quarterly Report on Form 10-Q filed on November 9, 2007.)     
|       | 
|10.16* |  | Second Amendment to Amended and Restated Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Edward H. Linde. (Incorporated by reference to Exhibit
10.16 to Boston Properties, Inc.s Annual Report on Form 10-K filed on March 2, 2009.)        
|       | 
|10.17* |  | Employment Agreement by and between Douglas T. Linde and Boston Properties, Inc. dated as of November 29, 2002. (Incorporated by reference to Exhibit 10.12 to Boston Properties, Inc.s
Annual Report on Form 10-K filed on February 27, 2003.)                                              
|       | 
|10.18* |  | First Amendment to Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Douglas T. Linde. (Incorporated by reference to Exhibit 10.3 to Boston
Properties, Inc.s Quarterly Report on Form 10-Q filed on November 9, 2007.)                         
|       | 
|10.19* |  | Second Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Douglas T. Linde. (Incorporated by reference to Exhibit 10.19 to Boston
Properties, Inc.s Annual Report on Form 10-K filed on March 2, 2009.)                            
|       | 
|10.20* |  | Amended and Restated Employment Agreement by and between Raymond A. Ritchey and Boston Properties, Inc. dated as of November 29, 2002. (Incorporated by reference to Exhibit 10.15 to Boston
Properties, Inc.s Annual Report on Form 10-K filed on February 27, 2003.)                       
|       | 
|10.21* |  | First Amendment to Amended and Restated Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Raymond A. Ritchey. (Incorporated by reference to
Exhibit 10.4 to Boston Properties, Inc.s Quarterly Report on Form 10-Q filed on November 9, 2007.)  
|       | 
|10.22* |  | Second Amendment to Amended and Restated Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Raymond A. Ritchey. (Incorporated by reference to
Exhibit 10.22 to Boston Properties, Inc.s Annual Report on Form 10-K filed on March 2, 2009.)     
|       | 
|10.23* |  | Amended and Restated Employment Agreement by and between E. Mitchell Norville and Boston Properties, Inc. dated as of August 25, 2005. (Incorporated by reference to Exhibit 10.1 to Boston
Properties, Inc.s Quarterly Report on Form 10-Q filed on November 9, 2005.)                      
|       | 
|10.24* |  | First Amendment to Amended and Restated Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and E. Mitchell Norville. (Incorporated by reference to
Exhibit 10.5 to Boston Properties, Inc.s Quarterly Report on Form 10-Q filed on November 9, 2007.)
|       | 
|10.25* |  | Second Amendment to Amended and Restated Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and E. Mitchell Norville. (Incorporated by reference to
Exhibit 10.25 to Boston Properties, Inc.s Annual Report on Form 10-K filed on March 2, 2009.)   
|       | 
|10.26* |  | Employment Agreement by and between Michael E. LaBelle and Boston Properties, Inc. dated as of January 24, 2008. (Incorporated by reference to Exhibit 10.2 to Boston Properties, Inc.s
Current Report on Form 8-K filed on January 29, 2008.)                                               
|       | 
|10.27* |  | First Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Michael E. LaBelle. (Incorporated by reference to Exhibit 10.27 to Boston
Properties, Inc.s Annual Report on Form 10-K filed on March 2, 2009.)                           



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|       |  |                                                                                                                                                                                                                                                                                           
|------ |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|10.28* |  | Employment Agreement by and between Peter D. Johnston and Boston Properties, Inc. dated as of August 25, 2005. (Incorporated by reference to Exhibit 10.2 to Boston Properties, Inc.s
Quarterly Report on Form 10-Q filed on November 9, 2005.)                                          
|       | 
|10.29* |  | First Amendment to Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Peter D. Johnston. (Incorporated by reference to Exhibit 10.6 to Boston
Properties, Inc.s Quarterly Report on Form 10-Q filed on November 9, 2007.)                    
|       | 
|10.30* |  | Second Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Peter D. Johnston. (Incorporated by reference to Exhibit 10.30 to Boston
Properties, Inc.s Annual Report on Form 10-K filed on March 2, 2009.)                       
|       | 
|10.31* |  | Employment Agreement by and between Bryan J. Koop and Boston Properties, Inc. dated as of November 29, 2002. (Incorporated by reference to Exhibit 10.10 to Boston Properties, Inc.s
Annual Report on Form 10-K filed on February 27, 2003.)                                             
|       | 
|10.32* |  | First Amendment to Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Bryan J. Koop. (Incorporated by reference to Exhibit 10.7 to Boston
Properties, Inc.s Quarterly Report on Form 10-Q filed on November 9, 2007.)                        
|       | 
|10.33* |  | Second Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Bryan J. Koop. (Incorporated by reference to Exhibit 10.33 to Boston
Properties, Inc.s Annual Report on Form 10-K filed on March 2, 2009.)                           
|       | 
|10.34* |  | Amended and Restated Employment Agreement by and between Robert E. Selsam and Boston Properties, Inc. dated as of November 29, 2002. (Incorporated by reference to Exhibit 10.16 to Boston
Properties, Inc.s Annual Report on Form 10-K filed on February 27, 2003.)                     
|       | 
|10.35* |  | First Amendment to Amended and Restated Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Robert E. Selsam. (Incorporated by reference to Exhibit
10.8 to Boston Properties, Inc.s Quarterly Report on Form 10-Q filed on November 9, 2007.)
|       | 
|10.36* |  | Second Amendment to Amended and Restated Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Robert E. Selsam. (Incorporated by reference to
Exhibit 10.36 to Boston Properties, Inc.s Annual Report on Form 10-K filed on March 2, 2009.)   
|       | 
|10.37* |  | Compensation Agreement between Boston Properties, Inc. and Robert E. Selsam, dated as of August 10, 1995 relating to 90 Church Street. (Incorporated by reference to Exhibit 10.26 to Boston
Properties, Inc.s Registration Statement on Form S-11, File No. 333-25279.)                 
|       | 
|10.38* |  | Employment Agreement by and between Robert E. Pester and Boston Properties, Inc. dated as of December 16, 2002. (Incorporated by reference to Exhibit 10.14 to Boston Properties, Inc.s
Annual Report on Form 10-K filed on February 27, 2003.)                                          
|       | 
|10.39* |  | First Amendment to Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Robert E. Pester. (Incorporated by reference to Exhibit 10.9 to Boston
Properties, Inc.s Quarterly Report on Form 10-Q filed on November 9, 2007.)                     
|       | 
|10.40* |  | Second Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Robert E. Pester. (Incorporated by reference to Exhibit 10.40 to Boston
Properties, Inc.s Annual Report on Form 10-K filed on March 2, 2009.)                        
|       | 
|10.41* |  | Employment Agreement by and between Mitchell S. Landis and Boston Properties, Inc. dated as of November 26, 2002. (Incorporated by reference to Exhibit 10.11 to Boston Properties, Inc.s
Annual Report on Form 10-K filed on February 27, 2003.)                                        
|       | 
|10.42* |  | First Amendment to Employment Agreement, dated as of November 1, 2007, by and between Boston Properties, Inc. and Mitchell S. Landis. (Incorporated by reference to Exhibit 10.10 to Boston
Properties, Inc.s Quarterly Report on Form 10-Q filed on November 9, 2007.)                  
|       | 
|10.43* |  | Second Amendment to Employment Agreement, dated as of December 15, 2008, by and between Boston Properties, Inc. and Mitchell S. Landis. (Incorporated by reference to Exhibit 10.43 to Boston
Properties, Inc.s Annual Report on Form 10-K filed on March 2, 2009.)                      



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|       |  |                                                                                                                                                                                                                                                                                                                                     
|------ |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|10.44* |  | Senior Executive Severance Agreement by and among Boston Properties, Inc., Boston Properties Limited Partnership and Mortimer B. Zuckerman. (Incorporated by reference to Exhibit 10.17 to
Boston Properties, Inc.s Annual Report on Form 10-K filed on February 27, 2003.)                                                        
|       | 
|10.45* |  | First Amendment to the Senior Executive Severance Agreement, dated as of November 1, 2007, by and among Boston Properties, Inc., Boston Properties Limited Partnership and Mortimer B.
Zuckerman. (Incorporated by reference to Exhibit 10.11 to Boston Properties, Inc.s Quarterly Report on Form 10-Q filed on November 9, 2007.)
|       | 
|10.46* |  | Second Amendment to the Senior Executive Severance Agreement, dated as of December 15, 2008, by and among Boston Properties, Inc., Boston Properties Limited Partnership and Mortimer B.
Zuckerman. (Incorporated by reference to Exhibit 10.46 to Boston Properties, Inc.s Annual Report on Form 10-K filed on March 2, 2009.)    
|       | 
|10.47* |  | Senior Executive Severance Agreement by and among Boston Properties, Inc., Boston Properties Limited Partnership and Edward H. Linde. (Incorporated by reference to Exhibit 10.18 to Boston
Properties, Inc.s Annual Report on Form 10-K filed on February 27, 2003.)                                                              
|       | 
|10.48* |  | First Amendment to the Senior Executive Severance Agreement, dated as of November 1, 2007, by and among Boston Properties, Inc., Boston Properties Limited Partnership and Edward H. Linde.
(Incorporated by reference to Exhibit 10.12 to Boston Properties, Inc.s Quarterly Report on Form 10-Q filed on November 9, 2007.)      
|       | 
|10.49* |  | Second Amendment to the Senior Executive Severance Agreement, dated as of December 15, 2008, by and among Boston Properties, Inc., Boston Properties Limited Partnership and Edward H. Linde.
(Incorporated by reference to Exhibit 10.49 to Boston Properties, Inc.s Annual Report on Form 10-K filed on March 2, 2009.)          
|       | 
|10.50* |  | Boston Properties, Inc. Senior Executive Severance Plan. (Incorporated by reference to Exhibit 10.19 to Boston Properties, Inc.s Annual Report on Form 10-K filed on February 27, 2003.)                                                                                                                                           
|       | 
|10.51* |  | First Amendment to the Boston Properties, Inc. Senior Executive Severance Plan, dated as of October 18, 2007. (Incorporated by reference to Exhibit 10.13 to Boston Properties, Inc.s
Quarterly Report on Form 10-Q filed on November 9, 2007.)                                                                                    
|       | 
|10.52* |  | Second Amendment to the Boston Properties, Inc. Senior Executive Severance Plan, dated as of December 15, 2008. (Incorporated by reference to Exhibit 10.52 to Boston Properties, Inc.s
Annual Report on Form 10-K filed on March 2, 2009.)                                                                                        
|       | 
|10.53* |  | Boston Properties, Inc. Executive Severance Plan, dated as of July 30, 1998. (Incorporated by reference to Exhibit 10.20 to Boston Properties, Inc.s Annual Report on Form 10-K filed on
February 27, 2003.)                                                                                                                       
|       | 
|10.54* |  | First Amendment to the Boston Properties, Inc. Executive Severance Plan, dated as of October 18, 2007. (Incorporated by reference to Exhibit 10.14 to Boston Properties, Inc.s Quarterly
Report on Form 10-Q filed on November 9, 2007.)                                                                                           
|       | 
|10.55* |  | Boston Properties, Inc. Officer Severance Plan, dated as of July 30, 1998. (Incorporated by reference to Exhibit 10.15 to Boston Properties, Inc.s Quarterly Report on Form 10-Q filed on
November 9, 2007.)                                                                                                                       
|       | 
|10.56* |  | First Amendment to the Boston Properties, Inc. Officer Severance Plan, dated as of October 18, 2007. (Incorporated by reference to Exhibit 10.16 to Boston Properties, Inc.s Quarterly
Report on Form 10-Q filed on November 9, 2007.)                                                                                             
|       | 
|10.57* |  | Second Amendment to the Boston Properties, Inc. Officer Severance Plan, dated as of December 15, 2008. (Incorporated by reference to Exhibit 10.57 to Boston Properties, Inc.s Annual
Report on Form 10-K filed on March 2, 2009.)                                                                                                 



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|       |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|------ |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|10.58* |  | Form of Indemnification Agreement by and among Boston Properties, Inc., Boston Properties Limited Partnership and certain officers and directors of the Company. (Incorporated by reference to
Exhibit 10.1 to Boston Properties, Inc.s Quarterly Report on Form 10-Q filed on August 9, 2004.)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|       | 
|10.59  |  | Fifth Amended and Restated Revolving Credit Agreement, dated as of August 3, 2006, among Boston Properties Limited Partnership and the banks identified therein and Bank of America, N.A. as
administrative agent, swingline lender and fronting bank, JPMorgan Chase Bank, N.A. as syndication agent, and Eurohypo AG-New York Branch, Keybank National Association, Wells Fargo Bank National Association as documentation agents, with The Bank of
New York, Citicorp North America, Inc., Citizens Bank of Massachusetts, Deutsche Bank Trust Company, PNC Bank-National Association as co-managing agents and J.P. Morgan Securities Inc. and Banc of America Securities LLC acting as joint lead
arrangers and joint bookrunners. (Incorporated by reference to Exhibit 10.2 to Boston Properties, Inc.s Quarterly Report on Form 10-Q filed on August 9, 2006.)
|       | 
|10.60  |  | Commitment Increase Agreement, dated as of June 6, 2008, among Boston Properties Limited Partnership and the lenders identified therein. (Incorporated by reference to Exhibit 10.1 to the
Current Report on Form 8-K of Boston Properties, Inc. filed on June 12, 2008.)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|       | 
|10.61  |  | Commitment Increase Agreement, dated as of July 21, 2008, among Boston Properties Limited Partnership and the lenders identified therein. (Incorporated by reference to Exhibit 10.1 to the
Current Report on Form 8-K of Boston Properties, Inc. filed on July 23, 2008.)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|       | 
|10.62  |  | Contribution Agreement, dated as of May 23, 2008, between Fifth Avenue 58/59 Acquisition Co. L.P., BP 767 Fifth LLC and 767 Venture, LLC, and (for purposes of Sections 10(h), 18,
20(c)(i) and 38(c)) Boston Properties Limited Partnership. (Incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K of Boston Properties, Inc. filed on May 28, 2008.)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|       | 
|10.63  |  | Purchase and Sale Agreement, dated as of May 23, 2008, between 125 West 55th Street Owner LLC, Two Grand Central Tower LLC, 540 Investment Land Company LLC, 540 Madison Avenue Lease LLC
and BP Manhattan LLC, and (for purposes of Sections 10(h), 20(c)(i), 38(e) and 38(f)) Boston Properties Limited Partnership. (Incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K of Boston Properties, Inc. filed on
May 28, 2008.)                                                                                                                                                                                                                                                                                                                                                                                                                 
|       | 
|10.64  |  | Contribution Agreement, dated as of May 23, 2008, between Fifth Avenue 58/59 Acquisition Co. L.P. and Boston Properties Limited Partnership. (Incorporated by reference to Exhibit 10.3 to
the Current Report on Form 8-K of Boston Properties, Inc. filed on May 28, 2008.)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|       | 
|12.1   |  | Statement re Computation of Ratios. (Filed herewith.)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|       | 
|21.1   |  | Subsidiaries of Boston Properties, Inc. (Filed herewith.)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|       | 
|23.1   |  | Consent of PricewaterhouseCoopers LLP, Independent Registered Public Accounting firm. (Filed herewith.)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|       | 
|31.1   |  | Rule 13a-14(a)/15d-14(a) Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. (Filed herewith.)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|       | 
|31.2   |  | Rule 13a-14(a)/15d-14(a) Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. (Filed herewith.)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|       | 
|32.1   |  | Section 1350 Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. (Furnished herewith.)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|       | 
|32.2   |  | Section 1350 Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. (Furnished herewith.)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 



|* | Indicates management contract or compensatory plan or arrangement required to be filed or incorporated by reference as an exhibit to this Form 10-K pursuant to Item 15(b) of
Form 10-K.
|- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant, Boston Properties Limited Partnership, has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.



|              |  |                                                                                        |  |                                               
|------------- |  | -------------------------------------------------------------------------------------- |  | ----------------------------------------------
|              |  | BOSTON PROPERTIES LIMITED PARTNERSHIP By: Boston Properties, Inc., its General Partner
|Date:         |  |                                                                                        |  |                                               
|March 2, 2009 |  | By:                                                                                    |  | /s/    MICHAEL E.
LABELLE                     
|              |  |                                                                                        |  | Michael E. LaBelle                            
|              |  |                                                                                        |  | Senior Vice President, Chief Financial Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed
below by the following persons on behalf of the Registrant, and in the capacities and on the dates indicated.



|              |  |     |  |                                                         
|------------- |  | --- |  | --------------------------------------------------------
|March 2, 2009 |  |     |  |                                                         
|              |  |    
|              |  | By: |  | /s/    MORTIMER B.
ZUCKERMAN                            
|              |  |     |  | Mortimer B. Zuckerman Chairman of the Board of Directors
|              |  |    
|              |  | By: |  | /s/    EDWARD H.
LINDE                                  
|              |  |     |  | Edward H. Linde                                         
|              |  |     |  | Chief Executive Officer and Director                    
|              |  |    
|              |  | By: |  | /s/    LAWRENCE S.
BACOW                                
|              |  |     |  | Lawrence S. Bacow                                       
|              |  |     |  | Director                                                
|              |  |    
|              |  | By: |  | /s/    ZOË
BAIRD                                        
|              |  |     |  | Zoë Baird                                               
|              |  |     |  | Director                                                
|              |  |    
|              |  | By: |  | /s/    CAROL B.
EINIGER                                 
|              |  |     |  | Carol B. Einiger Director                               
|              |  |    
|              |  | By: |  | /s/    FREDERICK J.
ISEMAN                              
|              |  |     |  | Frederick J. Iseman Director                            
|              |  |    
|              |  | By: |  | /s/    ALAN J.
PATRICOF                                 
|              |  |     |  | Alan J. Patricof                                        
|              |  |     |  | Director                                                
|              |  |    
|              |  | By: |  | /s/    RICHARD E.
SALOMON                               
|              |  |     |  | Richard E. Salomon                                      
|              |  |     |  | Director                                                
|              |  |    
|              |  | By: |  | /s/    MARTIN
TURCHIN                                   
|              |  |     |  | Martin Turchin                                          
|              |  |     |  | Director                                                



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| |  |     |  |                                                                               
| |  | --- |  | ------------------------------------------------------------------------------
| |  | By: |  | /s/    DAVID A.
TWARDOCK                                                      
| |  |     |  | David A. Twardock                                                             
| |  |     |  | Director                                                                      
| |  |    
| |  | By: |  | /s/    MICHAEL E.
LABELLE                                                     
| |  |     |  | Michael E. LaBelle                                                            
| |  |     |  | Senior Vice President, Chief Financial Officer and Principal Financial Officer
| |  |    
| |  | By: |  | /s/    ARTHUR S.
FLASHMAN                                                     
| |  |     |  | Arthur S. Flashman                                                            
| |  |     |  | Vice President, Controller and Principal Accounting Officer                   



170