Document:

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                                                                   EXHIBIT 10.74

                       Tax Increment Financing Agreement
                                    Between
                            The Town Of Framingham,
                   Bishop 108 Associates Limited Partnership
                          And Lifeline Systems, Inc.

Agreement made as of this 25th day of October, 2000 by and between the Town of
Framingham["Town"], Bishop 108 Associates Limited Partnership ["Bishop"], and
Lifeline Systems, Inc. ["Lifeline"].

WHEREAS, Bishop is a Massachusetts Limited Liability Partnership, having its
principal office at: c/o LEVCO, Inc., Rosemary Office Center, 145 Rosemary
Street, Suite E, Needham, Massachusetts 02194, authorized to do business in
Massachusetts; and

WHEREAS, Lifeline is a Massachusetts Corporation, having its principal office at
111 Lawrence Street , Framingham, Massachusetts 01702; and

WHEREAS, the Town is a Massachusetts Municipal Corporation acting through its
Board of Selectmen; and

WHEREAS, the parties to this Agreement are desirous of entering into an
Agreement in accordance with the provisions of Massachusetts General Laws
Chapter 23A; and

WHEREAS, Lifeline has entered into a 15-year lease agreement with Bishop, the
record owner of 111 Lawrence Street, Framingham, Massachusetts; shown in the
municipal assessors records as Lot 7 of Block 159 Map number 81 (hereinafter
"the Property"); and

WHEREAS, the Property is 147, 057 square feet and houses an 84,000 square foot
facility serving as the headquarters of Lifeline (hereinafter called "the
Project"); and

Whereas, Lifeline undertook a complete rehabilitation of 111 Lawrence Street in
1999 which cost $5,239,000; and

Whereas, prior to said rehabilitation commencing in 1999, the Town was only
receiving $53,428 in property taxes on this property; and

Whereas, immediately following in fiscal year 2000 the Town received over
$83,000 and is expected to receive over $121,000 in property taxes for fiscal
year 2001 for this property through enactment of this Agreement, and

WHEREAS, the Town is located within an Economic Target Area [ETA] as described
in Massachusetts General Laws, Chapter 23A, Section 3D; and

WHEREAS, the Property is within an Economic Opportunity Area [EOA] which is
within the ETA, as described in Chapter 23A, Section 3E; and

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                                                                     page 1 of 6
<PAGE>

Tax Increment Financing Agreement
Between the Town of Framingham,
Bishop 108 Associates Limited Partnership and Lifeline Systems, Inc.
--------------------------------------------------------------------------------

WHEREAS, the ongoing use and improvements made have resulted in expansion of
permanent, full-time employees at the Property and in the number of full-time
employees of Lifeline in the Commonwealth; and

Whereas, the above cited investment in the building structure and increased
employment opportunities will result in additional improvements being spun out
for the Town's entire Central Business District; and

WHEREAS, the entire Property is located within the Town as shown on Exhibit "A";
and

WHEREAS, the Town, by vote of a Town Meeting duly called and held on October 25,
2000, has approved the Project and has found, based upon the information
submitted to it, upon the representation contained herein, and upon the Town's
additional investigation, that:

1.   The Project Proposal as set forth in the certified application, a copy of
     which is on file with the office of the Town Manager and the Town Clerk,
     complies with the definition of a project proposal set forth in
     Massachusetts General Laws, Chapter 23A, Section 3A;

2.   The Project, as described in the Project proposal and the documentation
     submitted therewith, is consistent with the Town's plans relative to the
     Project EOA and will not overburden the Town's supporting infrastructure;

3.   Lifeline has: surpassed initial employment objectives of 600 new employees
     advanced for this Project from among residents of the Project ETA; offered
     employment opportunities to such residents, without regard for race, color,
     creed, national origin or disability; and is proposing additional
     employment growth of 170 positions both at 111 Lawrence Street and newly
     leased sites in the Downtown EOA;

4.   Lifeline hereby assures the Town that the corporation will encourage its
     banking institutions to participate in the Community Reinvestment Act
     initiatives; and

5.   The Project will, if certified, have a reasonable chance of increasing
     employment opportunities for residents of the ETA and will reduce the
     conditions intended to be alleviated by Massachusetts General Laws, Chapter
     23A.

WHEREAS, the Town has requested a designation of the Project as a certified
project for the term allowed by the EOA designation; and

Now THEREFORE, in consideration of the mutual promises herein contained and in
order to promote economic development, the stability of the communities and the
expansion of employment opportunities within the Framingham, Marlborough,
Hudson, Ashland, and Northborough Economic Target Area, Lifeline, Bishop, and
the Town, acting by its Board of Selectmen, hereby enter into this Agreement as
of the date first written above and agree that;

     f)   Conditions met prior to this tax increment agreement being voted are:

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                                                                     page 2 of 6

<PAGE>

Tax Increment Financing Agreement
Between the Town of Framingham,
Bishop 108 Associates Limited Partnership and Lifeline Systems, Inc.
--------------------------------------------------------------------------------

     a)   Bishop entered into a lease agreement for the building to Lifeline for
          a period of fifteen years;

     b)   Lifeline commenced to make (or caused to be made) improvements to the
          Property. The said improvements consisted of renovation and
          refurbishment of approximately 84,000 square feet of office space plus
          site and landscape plan improvements to attendant parking facilities
          for use by Lifeline.

     f)   Lifeline created over 600 positions at this site including 138
          positions filled with Framingham residents.

2.   The Town represents to Bishop, Lifeline, and the Economic Assistance
     Coordinating Council that:

     a)   It has complied with all substantive and procedural requirements in
          executing this Agreement and it is a legal, valid, and binding
          document in accordance with the laws of the Commonwealth of
          Massachusetts;

     b)   The Property is within the Framingham EOA, this Agreement is
          consistent with the Framingham TIF Plan and upon approval of this plan
          by the Economic Assistance Coordinating Council, the Property will
          receive from the Town, tax increment exemptions in accordance with
          this Agreement.

3.   Bishop and Lifeline represent to and agree with the Town and the Economic
     Assistance Coordinating Council that:

     a)   They have complied with all substantive and procedural requirements in
          executing this Agreement and it is a legal, valid, and binding
          document in accordance with the laws of the Commonwealth of
          Massachusetts;

     b)   No public improvements are required to be made by the Town in order to
          use the Property;

     c)   Lifeline shall make payment to the Town a sum of money in the amount
          of $37,500 by no later than January 2, 2002. Said payment shall be
          utilized by the Town to purchase a new digitized fire alarm for the
          central fire station in accordance with the description found in the
          Town's currently adopted Capital Budget.

     d)   Bishop agrees that all state tax credits and local property tax
          benefits derived through this Agreement shall accrue directly to the
          lessee Lifeline.

     e)   Bishop and Lifeline will comply with all applicable laws, by-laws,
          rules, and regulations relating to the Project, including, but not
          limited to, the Zoning By-Laws of the Town;

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                                                                     page 3 of 6
<PAGE>

Tax Increment Financing Agreement
Between the Town of Framingham,
Bishop 108 Associates Limited Partnership and Lifeline Systems, Inc.
--------------------------------------------------------------------------------

     f)   Lifeline and Bishop incorporate by reference herein their
          representations in the Certified Project Application dated September
          22, 2000, in the form filed with the Town Clerk, Town Manager,
          Planning Department, and the Planning Board;

4.   Lifeline represents to and agrees with the Town and the Economic Assistance
     Coordinating Council that:

     a)   Lifeline will not seek or accept any material changes to its Certified
          Project Application or to this Agreement before the Economic
          Assistance Coordinating Council without prior approval of the Town;

     b)   Lifeline will provide an annual report to the Town and to the Economic
          Assistance Coordinating Council showing its employment growth. The
          report will identify new employees by job classification and as
          full-time or part-time employees. The report will provide such
          additional information as may reasonably be required by the Town
          Manager to indicate the achievement of equal opportunity within the
          ETA;

     c)   Lifeline agrees to use reasonable efforts (provided the prospective
          employees have the appropriate skills) to hire at least 50 percent
          (50%) of the new employees at the facility who are residents of he
          Project ETA. Lifeline will advertise employment openings in classified
          publications with local distribution and with local educational
          institutions such as Framingham State College, Massachusetts Bay
          Community College, and Keefe Vocational Technical School. Lifeline
          will also notify the Framingham Human Relations Commission of
          employment opportunities, and will meet with the Regional PIC,
          Regional Employment Board, and the Chamber of Commerce to identify
          skills needed so that programs may be developed to ensure that the
          Framingham labor pool possesses the necessary training for employment
          at Lifeline and will continue to cooperate with them in offering and
          developing training programs for otherwise qualified candidates. In
          order to enhance recruiting, Lifeline agrees to hold discussions with
          and advise appropriate institutions in Framingham regarding programs
          and courses that would offer appropriate training so that more jobs
          may be filled from the ETA.

5.   Provided that the conditions stated above are met, then:

     a)   Lifeline shall be entitled to an EOA investment tax credit of five
          percent (5%), in accordance with the provisions of the general laws;

     b)   For the Town's fiscal year 2000, the assessed value of the Property
          shall be fixed according to law (the "Base Value"). The Base Value can
          be adjusted annually, only if performed in accordance with
          Massachusetts General Laws, Chapter 40, Section 59, as it may be
          amended or any affected provisions of law enacted in replacement
          thereof;

     c)   For fiscal years 2001through 2015, (i) the fair cash value of the
          Property shall be determined annually in accordance with the law, (ii)
          the Base Value as adjusted under paragraph 5.b. of this Agreement
          shall be subtracted there from and (iii) the remainder shall represent
          the fair cash value of the improvements. The improvements shall be
          exempt from

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                                                                     page 4 of 6
<PAGE>

Tax Increment Financing Agreement
Between the Town of Framingham,
Bishop 108 Associates Limited Partnership and Lifeline Systems, Inc.
--------------------------------------------------------------------------------

          assessment and taxation in accordance with the following schedule as
          calculated in Exhibit B, which is hereby made a part of this
          Agreement:

                               Exemptions Schedule
                  ----------------------------------------------
                     Fiscal Year        Exemption Percentage
                  ----------------------------------------------
                        2001                    20%
                  ----------------------------------------------
                        2002                    15%
                  ----------------------------------------------
                        2003                    10%
                  ----------------------------------------------
                        2004                     5%
                  ----------------------------------------------
                        2005                     5%
                  ----------------------------------------------
                        2006                     1%
                  ----------------------------------------------
                        2007                     1%
                  ----------------------------------------------
                        2008                     1%
                  ----------------------------------------------
                        2009                     1%
                  ----------------------------------------------
                        2010                     1%
                  ----------------------------------------------
                        2011                     1%
                  ----------------------------------------------
                        2012                     1%
                  ----------------------------------------------
                        2013                     1%
                  ----------------------------------------------
                        2014                     1%
                  ----------------------------------------------
                        2015                     1%
                  ----------------------------------------------

6.   This Agreement shall be binding upon the parties hereto and upon any
     subsequent owners of the Property and their successors and/or assigns.

7.   The Town hereby authorizes the Board of Selectmen to execute this Agreement
     on its behalf and to monitor and enforce compliance by Lifeline and Bishop
     with its terms. The Board of Selectmen is authorized to act for and on
     behalf of the Town in proceedings relating to the approval of this
     Agreement by the Economic Assistance Coordinating Council.

8.   The Board of Assessors is responsible for implementing paragraphs 5.b. and
     5.c. of this Agreement.

9.   This Agreement may be assigned, with prior written notice to the Town, by
     Lifeline or by Bishop to any affiliated entity or to a successor owner of
     the Property (whether by deed, foreclosure, deed-in-lieu of foreclosure or
     otherwise) or affiliated entities, provided that the Town consents to such
     assignment. The Town's consent shall not be unreasonably withheld so long
     as the proposed assignee has the demonstrated capacity to perform and does
     perform the obligations undertaken herein by Bishop and/or Lifeline.

       IN WITNESS WHEREOF, each of the Parties has executed this Agreement on
    the date shown next to the signature of its authorized representative.

                                                         Town Of Framingham
                                                      By Its Board Of Selectmen
Bishop 108 Associates Limited Partnership               Or A Majority Thereof

/s/ Donald Levine                          /s/ Charles Sisitsky
----------------------------------         --------------------
             Signature                         Signature of Authorized Official

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                                                                     page 5 of 6
<PAGE>

Tax Increment Financing Agreement
Between the Town of Framingham,
Bishop 108 Associates Limited Partnership and Lifeline Systems, Inc.
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11/17/00                                     /s/ Esther A.H. Hopkins
-----------------------------------------------------------------
            Date of Signature             Signature of Authorized Official

                                              /s/ Christopher Petrini
                                                  -------------------
          Lifeline Systems, Inc.          Signature of Authorized Official

/s/ Dennis M. Hurley                        /s/    John M. Kahn
----------------------------------------------------------------------------
                       Signature          Signature of Authorized Official

11/09/00                                   /s/ Ginger Estey
----------------------------------------------------------------------------
                   Date of Signature      Signature of Authorized Official

                                                      11/01/00
                                                      ---------
                                                  Date of Signature

                                                    Town Counsel

                                          /s/ Aaron Bikofsky
                                          ----------------------------------
                                                     Signature

                                                 11/15/00
---------------------------------------------------------
                                                  Date of Signature

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                                                                     page 6 of 6<PAGE>

                                                                    Exhibit 10.5

                     BOSTON PROPERTIES LIMITED PARTNERSHIP

                          CERTIFICATE OF DESIGNATIONS

              ESTABLISHING AND FIXING THE RIGHTS, LIMITATIONS AND
                   PREFERENCES OF A SERIES OF PREFERRED UNITS

                    DENOMINATED THE SERIES Z PREFERRED UNITS

     Reference is made to the Second Amended and Restated Agreement of Limited
Partnership (the "Partnership Agreement") of Boston Properties Limited
Partnership, a Delaware limited partnership (the "Partnership"), of which this
Certificate of Designations (this "Certificate") shall become a part.
Capitalized terms used herein and not defined herein have the meanings ascribed
thereto in the main part of the Partnership Agreement.  Section references are
(unless otherwise specified) references to sections in this Certificate.

     WHEREAS, Section 14.1.B(3) of the main part of the Partnership Agreement
permits the General Partner, without the consent of the Limited Partners, to
amend the Partnership Agreement for the purpose of setting forth and reflecting
in the Partnership Agreement the designations, rights, powers, duties, and
preferences of holders of any additional Partnership Interests issued pursuant
to Section 4.2.A of the main part of the Partnership Agreement; and

     WHEREAS, the General Partner desires by this Certificate to so amend the
Partnership Agreement as of this __ day of December, 2000.

     NOW, THEREFORE, the General Partner has set forth in this Certificate the
following description of the preferences and other rights, voting powers,
restrictions, limitations as to distributions, qualifications and terms and
conditions of redemption and conversion of a class and series of Partnership
Interest to be represented by Partnership Units which shall be referred to as
"Series Z Preferred Units":

     1.   Designation and Number.  A series of Preferred Units, designated the
"Series Z Preferred Units," is hereby established.

     2.   Definitions.  For purposes of this Certificate of Designations, the
following terms shall have the meanings indicated:

     "Adjusted Fair Market Value" shall have the meaning set forth in paragraph
(b) of Section 5 hereof.

     "Adjustment Event" shall have the meaning set forth in paragraph (d) of
Section 7 hereof.

     "Adjustment Factor" shall mean a factor equal to one (1), unless one or
more Adjustment Events occur between the Signing Date and any of the Conversion
Date, a Redemption Date or

                                       1
<PAGE>

an Option Strike Date, as applicable, in which case this factor shall be
recalculated pursuant to Section 7(d) hereof.

     "Constituent Person" shall have the meaning set forth in paragraph (e) of
Section 7  hereof.

     "Contribution Agreement" means that certain Contribution Agreement dated as
of February 11, 2000 by and among the Owner, as named therein, on the one hand,
and the Partnership, on the other hand (as may be amended, modified or
supplemented from time to time).

     "Conversion Price" shall mean the Fair Market Value of a Common Unit as of
either the Conversion Date or the Option Strike Date, as applicable.

     "Conversion Date" shall have the meaning set forth in Section 7(a) hereof.

     "Current Market Price" of a REIT Share or of a publicly traded security of
any other issuer for any day shall mean the last reported sales price, regular
way, on such day, or, if no sale takes place on such day, the average of the
reported closing bid and asked prices on such day, regular way, in either case
as reported on the New York Stock Exchange ("NYSE") or, if such security is not
listed or admitted for trading on the NYSE, on the principal national securities
exchange on which such security is listed or admitted for trading or, if not
listed or admitted for trading on any national securities exchange, on the
Nasdaq National Market or, if such security is not quoted on such Nasdaq
National Market, the average of the closing bid and asked prices on such day in
the over-the-counter market as reported by Nasdaq or, if bid and asked prices
for such security on such day shall not have been reported through Nasdaq, the
average of the bid and asked prices on such day as furnished by any NYSE member
firm regularly making a market in such security selected for such purpose by the
Chief Executive Officer of the Partnership or the General Partner.  "Current
Market Price" of a Common Unit as of any day means the Current Market Price of a
REIT Share multiplied by the Conversion Factor, as such term is defined in the
main part of the Partnership Agreement.

     "Distribution Payment Date" shall mean the dates upon which the General
Partner makes quarterly distributions in accordance with Section 5.1 of the main
part of the Partnership Agreement.

     "Distribution Periods" shall have the meaning given such term in the main
part of the Partnership Agreement.

     "Fair Market Value" shall mean the average of the daily Current Market
Prices per Common Unit during the ten (10) consecutive Trading Days ending not
later than (and including) the third business day immediately preceding the day
in question.

     "Full Distribution Period" shall have the meaning set forth in paragraph
(a) of Section 3 hereof.

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<PAGE>

     "Half Distribution Period" shall have the meaning set forth in paragraph
(a) of Section 3 hereof.

     "Junior Units" shall mean the Common Units and any other class or series of
Partnership Units constituting junior units within the meaning set forth in
paragraph (c) of Section 9 hereof.

     "Liquidation Event" shall have the meaning set forth in paragraph (a) of
Section 4 hereof.

     "Liquidation Preference" shall have the meaning set forth in paragraph (a)
of Section 4 hereof.

     "Non-Electing Unit" shall have the meaning set forth in paragraph (e) of
Section 7 hereof.

     "Optional Conversion Notice" shall have the meaning set forth in paragraph
(a) of Section 6 hereof.

     "Optional Conversion Right" shall have the meaning set forth in paragraph
(a) of Section 6 hereof.

     "Option Strike Date" shall have the meaning set forth in paragraph (a) of
Section 6 hereof.

     "Parity Units" shall have the meaning set forth in paragraph (b) of Section
9 hereof.

     "Redemption Amount" shall have the meaning set forth in paragraph (a) of
Section 5 hereof.

     "Redemption Date" shall have the meaning set forth in paragraph (a) of
Section 5 hereof.

     "Redemption Notice" shall have the meaning set forth in paragraph (a) of
Section 5 hereof.

     "Redemption Requirement" shall have the meaning set forth in paragraph (a)
of Section 5 hereof.

     "Reference Record Date" shall have the meaning set forth in paragraph (a)
of Section 3 hereof.

     "Registration Rights and Lock-Up Agreement" shall mean that certain
Registration Rights and Lock-Up Agreement, dated as of December __, 2000,
between the Company and the Holders named therein.

     "Regular Common Unit Distribution" shall have the meaning set forth in
paragraph (a) of Section 3 hereof.

     "Securities" shall have the meaning set forth in paragraph (d)(iii) of
Section 7 hereof.

                                       3
<PAGE>

     "Set apart for payment" shall be deemed to include, without any action
other than the following, the recording by the Partnership in its accounting
ledgers of any accounting or bookkeeping entry which indicates, pursuant to a
declaration of a distribution by the General Partner, the allocation of funds to
be so paid on any series or class of Partnership Units; provided, however, that
if any funds for any class or series of Junior Units or Parity Units are placed
in a separate account of the Partnership or delivered to a disbursing, paying or
other similar agent, then "set apart for payment" with respect to the Series Z
Preferred Units shall mean placing such funds in a separate account or
delivering such funds to a disbursing, paying or other similar agent.

     "Signing Date" shall mean February 11, 2000 (the date of signing of the
Contribution Agreement).

     "Stated Distribution" shall have the meaning set forth in paragraph (a) of
Section 3 hereof.

     "Trading Day" shall mean any day on which the securities in question are
traded on the New York Stock Exchange ("NYSE"), or if such securities are not
listed or admitted for trading on the NYSE, on the principal national securities
exchange on which such securities are listed or admitted, or if not listed or
admitted for trading on any national securities exchange, on the Nasdaq National
Market, or if such securities are not quoted on such Nasdaq National Market, in
the applicable securities market in which the securities are traded.

     "Transaction" shall have the meaning set forth in paragraph (e) of Section
7 hereof.

     "Zero Distribution Period" shall have the meaning set forth in paragraph
(a) of Section 3 hereof.

     3.   Distributions.

     (a) The holders of Series Z Preferred Units shall not be entitled to
receive any distributions until and including August 11, 2001 (18 months from
the Signing Date) (the "Zero Distribution Period").  After August 11, 2001 and
until and including February 11, 2002 (24 months from the Signing Date) (the
"Half  Distribution Period"), in respect of each Distribution Payment Date,
when, as and if authorized and declared by the General Partner out of assets
legally available for that purpose, the holders of Series Z Preferred Units
shall be entitled to receive distributions in an amount per Series Z Preferred
Unit equivalent to one-half of the regular, quarterly cash distribution per
Common Unit (the "Regular Common Unit Distribution") paid to holders of record
of Common Units on the record date (the "Reference Record Date") established by
the General Partner with respect to such Distribution Payment Date.   After
February 11, 2002 (24 months from the Signing Date), so long as Series Z
Preferred Units continue to be outstanding (the "Full  Distribution Period"), in
respect of each Distribution Payment Date, when, as and if authorized and
declared by the General Partner out of assets legally available for that
purpose, the holders of Series Z Preferred Units shall be entitled to receive
Stated Distribution in an amount per Series Z Preferred Unit equivalent to the
Regular

                                       4
<PAGE>

Common Unit Distribution paid to holders of record of Common Units on the
Reference Record Date. If a Distribution Period includes portions of the Zero
Distribution Period and the Half Distribution Period or parts of the Half
Distribution Period and the Full Distribution Period, then the Stated
Distribution shall be pro rated as appropriate on the basis of the number of
days within such Distribution Period included in a Zero Distribution Period, a
Half Distribution Period or a Full Distribution Period, as applicable.

     For purposes of determining the amount distributable to the holders of
Series Z Preferred Units on a per Series Z Preferred Units basis (the "Stated
Distribution"):

          (i) if an Adjustment Event occurs after the Signing Date, then the
              Stated Distribution for the applicable Distribution Period shall
              be calculated by multiplying the applicable Regular Common Unit
              Distribution by the Adjustment Factor, as recalculated to give
              effect to such Adjustment Event; and

         (ii) if a special cash distribution was paid to holders of Common
              Units on the Reference Record Date or at any time prior to the
              Reference Record Date and after the last record date for regular,
              quarterly cash distributions, then the Stated Distribution shall
              include, in addition to the Regular Distribution paid in respect
              of the Reference Record Date, an amount equal to the applicable
              proportionate share (depending on whether the payment is made
              during a Zero Distribution Period, a Half Distribution Period or a
              Full Distribution Period) of such special cash distribution paid
              in respect of each Common Unit (for clarity, it is noted that the
              effect of this sentence is to assure that in calculating the
              Stated Distribution the holders of Series Z Preferred Units will
              benefit from any cash distributions paid in respect of Common
              Units even if such cash distributions might not be characterized
              as "regular, quarterly cash distributions").

In the event that a Series Z Preferred Unit is outstanding for only a portion of
a Distribution Period, then the Stated Distribution with respect to such Series
Z Preferred Unit and such Distribution Period shall be determined as provided in
the preceding sentence but shall then be adjusted by multiplying such amount by
a fraction, the numerator of which equals the number of days such Series Z
Preferred Unit had been outstanding during such period and the denominator of
which shall equal the total number of days during such Distribution Period.
Such distributions shall, with respect to each Series Z Preferred Unit, be
payable in arrears on each Distribution Payment Date.  Each such distribution
shall be payable to the holders of record of the Series Z Preferred Units, as
they appear on the records of the Partnership on the applicable Reference Record
Date.

     (b) During any Distribution Period, so long as any Series Z Preferred Units
are outstanding, no distributions (whether in cash or in kind or upon
liquidation of the Partnership), except as described in the immediately
following sentence, shall be authorized and declared or paid on any series or
class or classes of Parity Units for such Distribution Period, unless full
distributions have been or contemporaneously are authorized and declared and
paid on the Series

                                       5
<PAGE>

Z Preferred Units for such Distribution Period. When distributions are not paid
in full upon the Series Z Preferred Units and any other class or classes of
Parity Units, all distributions authorized upon the Series Z Preferred Units and
any other class or classes of Parity Units shall be authorized and declared
ratably in proportion to the respective amounts of distributions unpaid on the
Series Z Preferred Units and such Parity Units (which shall not include any
accrual in respect of unpaid distributions for prior distribution periods if
such Parity Units do not have a cumulative distribution).

     (c) During any Distribution Period, so long as any Series Z Preferred Units
are outstanding, no distributions (other than distributions paid solely in
Junior Units, or options, warrants or rights to subscribe for or purchase Junior
Units) shall be authorized and declared or paid or other distribution authorized
and declared or made upon Junior Units for any period, unless the full
distributions on all outstanding Series Z Preferred Units and any other Parity
Units shall have been paid or are contemporaneously paid for such Distribution
Period with respect to the Series Z Preferred Units.

     (d) Without limiting the other provisions hereof, no distributions on
Series Z Preferred Units (other than liquidating distributions made in
accordance with Section 13.2 of the main part of the Partnership Agreement and
Section 4 hereof) shall be paid by the Partnership at such time as the terms and
provisions of any agreement of the Partnership or its affiliates or
subsidiaries, relating to bona fide indebtedness for borrowed money, prohibits
such declaration or payment or provides that such declaration or payment would
constitute a breach thereof or a default thereunder, or if such declaration or
payment shall be restricted or prohibited by law.

     (e) Upon liquidation, dissolution or winding up of the Partnership, no
distributions shall be made to any series or class or classes of Junior Units
until after payment shall have been made in full to the holders of any Series Z
Preferred Units then outstanding, as provided in Section 4(a).

     (f) With respect to Common Units issued upon conversion of Series Z
Preferred Units pursuant to Sections 6 or 7 hereof or upon redemption of Series
Z Preferred Units pursuant to Section 5 hereof, the first Regular Common Unit
Distribution subsequent to the date of conversion or redemption, as applicable,
shall be reduced by multiplying the amount of such distribution by a fraction,
the numerator of which equals the number of days such Common Units had been
outstanding during the quarterly period to which such distribution relates and
the denominator of which shall equal the total number of days during such
quarterly period.

     4.   Liquidation Preference.
          ----------------------

     (a) In the event of any liquidation, dissolution or winding up of the
Partnership, whether voluntary or involuntary ("Liquidation Event"), before any
payment or distribution of the assets of the Partnership (whether capital or
surplus) shall be made to or set apart for the holders of Junior Units, the
holders of Series Z Preferred Units shall be entitled to receive Thirty-Seven
Dollars and Twenty-Five Cents ($37.25) per Series Z Preferred Unit (the
"Liquidation Preference").

                                       6
<PAGE>

     If, upon any such Liquidation Event, the assets of the Partnership, or
proceeds thereof, distributable among the holders of Series Z Preferred Units
shall be insufficient to pay in full the preferential amount aforesaid and
liquidating payments on any other Parity Units, then such assets, or the
proceeds thereof, shall be distributed among the holders of such Series Z
Preferred Units and any such other Parity Units ratably in accordance with the
respective amounts that would be payable on such Series Z Preferred Units and
any such other Parity Units if all amounts payable thereon were paid in full.

     (b) Subject to the rights of the holders of Units of any series or class or
classes of Units ranking on a parity with or senior to the Series Z Preferred
Units upon any such Liquidation Event, after payment shall have been made in
full to the holders of the Series Z Preferred Units and Parity Units, as
provided in this Section 4, any series or class or classes of Junior Units
shall, subject to any respective terms and provisions applying thereto, be
entitled to receive any and all assets remaining to be paid or distributed.

     (c) After payment of the full amount of the liquidating distributions to
which they are entitled pursuant to Sections 4(a) and (b), the holders of Series
Z Preferred Units will have no right or claim to any of the remaining assets of
the Partnership.

     (d) The consolidation or merger of the Partnership with or into any other
corporation, partnership or entity or of any other corporation, partnership or
entity with or into the Partnership, or an exchange of Units or partnership
interests, or the sale, lease or conveyance of all or substantially all of the
property or business of the Partnership, shall not be deemed to constitute a
Liquidation Event.

     5.   Redemption.
          ----------

     (a) If the Conversion Date has not occurred by August 11, 2002 (30 months
after the Signing Date) the General Partner shall give written notice on that
date as required below and must thereafter redeem for cash all but not less than
all of the Series Z Preferred Units which have not been converted pursuant to
Section 6 or Section 7 hereof on or before the Redemption Date (as defined
below).  The obligation of the General Partner described in this paragraph 5(a)
shall be referred to as the "Redemption Requirement."  Pursuant to the
Redemption Requirement, the General Partner shall deliver a notice on  August
11, 2002 (30 months after the Signing Date) (the "Redemption Notice") to each
holder of record of Series Z Preferred Units.  The date on which the Series Z
Preferred Units are to be redeemed (the "Redemption Date") shall be selected by
the General Partner, shall be specified in the Redemption Notice, and shall be
not less than thirty (30) days or more than sixty (60) days after August 11,
2002 (30 months after the Signing Date).  The Redemption Notice shall be
delivered by the General Partner to each holder of record of outstanding Series
Z Preferred Units in accordance with Section 10.  If the General Partner
delivers a Redemption Notice to the holders of Series Z Preferred Units, such
holders shall have the right, subject to Section 7(a) hereof, to convert their
Series Z Preferred Units pursuant to Section 6 hereof on or before the
Redemption Date.  To the extent that Series Z Preferred Units are so converted,
the General Partner's obligation to redeem such units shall terminate effective
upon such conversion.

                                       7
<PAGE>

     (b) Upon redemption of Series Z Preferred Units by the Partnership on the
Redemption Date, each holder of a Series Z Preferred Unit so redeemed shall be
entitled to receive from the Partnership an amount in cash with respect to each
Series Z Preferred Unit redeemed pursuant to the Redemption Requirement an
amount (the "Redemption Amount") determined in accordance with clause (i) or
clause (ii), as applicable, of this paragraph 5(b) in exchange for such Series Z
Preferred Unit:

               (i)  if on the Redemption Date the Adjusted Fair Market Value (as
                    defined below) of a Common Unit is equal to or greater than
                    the Liquidation Preference, then the Redemption Amount shall
                    equal the product of (A) the Fair Market Value of a Common
                    Unit as of the Redemption Date multiplied by (B) the
                    Adjustment factor;

               (ii) If on the Redemption Date the Adjusted Fair Market Value of
                    a Common Unit is less than the Liquidation Preference, then
                    the Redemption Amount shall equal the Liquidation
                    Preference.

For purposes of this Section 5(b), the Adjusted Fair Market Value as of any date
shall equal the Fair Market Value as of such date multiplied by the Adjustment
Factor.

     (c) A Redemption Notice shall be provided in the manner provided in Section
10. Any defect in a Redemption Notice or in the mailing thereof, to any
particular holder, shall not affect the sufficiency of the notice or the
validity of the proceedings for redemption with respect to the other holders.
Any Redemption Notice that was mailed in the manner herein provided shall be
conclusively presumed to have been duly given on the date of deemed delivery
provided in Section 10, whether or not the holder receives the notice.  Notice
having been delivered as aforesaid, from and after the Redemption Date, said
Series Z Preferred Units shall no longer be deemed to be outstanding, and all
rights of the holders thereof as holders of Series Z Preferred Units of the
Partnership shall cease (except the rights to receive cash upon such
redemption).

     (d) After the redemption of Series Z Preferred Units as aforesaid, the
Partnership shall deliver to such holder, upon his written request, a
certificate of the General Partner certifying the number of Series Z Preferred
Units held by such person immediately after such redemption.

     (e) Each Series Z Preferred Unit holder covenants and agrees with the
Partnership that all Series Z Preferred Units delivered for redemption pursuant
to this Section 5 shall be delivered to the Partnership free and clear of all
liens, and, notwithstanding anything contained herein to the contrary, the
Partnership shall not be under any obligation to redeem Series Z Preferred Units
which are subject to any liens.

     (f) The rights of each holder of Series Z Preferred Unit pursuant to this
Certificate of Designations in general and this Section 5 in particular arise
solely from such holder ownership as a limited partner of partnership interests
in the Partnership and not from such holder being a creditor of the Partnership,
and none of such rights with respect to any required redemption pursuant to this
Section 5 shall constitute a "claim" as such term is defined in Section 101 of
the United States Bankruptcy Code, as amended; provided, however, that any

                                       8
<PAGE>

rights in respect of such Series Z Preferred Units shall constitute equity
interests of each holder thereof hereunder, it being agreed and understood that
no holder of Series Z Preferred Units is waiving any equity interest such holder
has in the Partnership or any rights to assert any such interests in any
bankruptcy proceeding or otherwise.

     6.   Conversion at the Option of a Holder.
          ------------------------------------

     Holders of Series Z Preferred Units shall have the right to convert all or
a portion of such units into Common Units, as follows:

     (a) Subject to and upon compliance with the provisions of this Section 6,
on the earlier of (A) any day from and after February 11, 2002 (24 months from
the Signing Date) or (B) the effective time of a Liquidation Event or (C) the
effective time of a Transaction (each such day, an "Option Strike Date"), each
holder of Series Z Preferred Units, upon giving prior written notice as provided
below, shall have the right to convert all or any portion of such holder's
Series Z Preferred Units into a number of fully paid and non-assessable Common
Units equal to the greater of (i) one (1) multiplied by the Adjustment Factor or
(ii) Liquidation Preference of  the Series Z Preferred Units to be converted
divided by the Conversion Price.  Such right of each holder of Series Z
Preferred Units described in this Section 6(a) shall be referred to as the
"Optional Conversion Right."

     In order to exercise its Optional Conversion Right, a holder of Series Z
Preferred Units shall deliver a notice (an "Optional Conversion Notice") in the
form attached hereto as Exhibit A to the Partnership (with a copy to the General
Partner) not less than 30 nor more than 60 days prior to an Option Strike Date;
provided, however, that the right of a holder of Series Z Preferred Units to
deliver an Optional Conversion Notice with respect to Series Z Preferred Units
called for redemption pursuant to Section 5 hereof shall terminate on that date
which is the third business day prior to the Redemption Date, unless the
Partnership shall default in making the cash payment required upon redemption on
the Redemption Date as provided in Section 5 hereof; and provided, further,
however, that if the General Partner has not given to the holders of Series Z
Preferred Units notice of a proposed or upcoming Liquidation Event or
Transaction at least forty-five (45) days prior to the effective date of such
Liquidation Event or Transaction, then holders of Series Z Preferred Units shall
have the right to deliver an Optional Conversion Notice until the earlier of (x)
the Twentieth day after such notice from the General Partner of a Liquidation
Event or Transaction or (y) the third business day immediately preceding the
effective date of the applicable Liquidation Event or Transaction.

     (b) A conversion of Series Z Preferred Units for which the holder thereof
has given an Optional Conversion Notice shall occur automatically after the
close of business on the applicable Option Strike Date without any action on the
part of the holders of Series Z Preferred Units, and immediately after the close
of business on the Option Strike Date the holders of Series Z Preferred Units
who had all or a portion of their Series Z Preferred Units converted shall be
credited on the books and records of the Partnership with the issuance as of the
opening of business on the next day of the Common Units issuable upon such
conversion.

                                       9
<PAGE>

     After the conversion of Series Z Preferred Units as aforesaid, the
Partnership shall deliver to such holder, upon his written request, a
certificate of the General Partner certifying the number of Common Units and
Preferred Units held by such person immediately after such conversion.

     Each conversion shall be deemed to have been effected immediately prior to
the close of business on the Option Strike Date specified in the Optional
Conversion Notice and the Series Z Preferred Units so presented for conversion
shall be deemed converted into Common Units at the close of business on such
date, and such conversion shall be at the Conversion Price in effect on such
date (unless such day is not a Business Day, in which event such conversion
shall be deemed to have become effective at the close of business on the next
succeeding Business Day).

     (c) No fractions of Common Units shall be issued upon conversion of the
Series Z Preferred Units.  Instead of any fractional interest in a Common Unit
that would otherwise be deliverable upon the conversion of a Series Z Preferred
Unit, the Partnership shall pay to the holder of such Series Z Preferred Unit an
amount in cash based upon the Current Market Price of Common Units on the
Trading Day immediately preceding the date of conversion. If more than one
Series Z Preferred Unit shall be surrendered for conversion at one time by the
same holder, the number of full Common Units issuable upon conversion thereof
shall be computed on the basis of the aggregate number of Series Z Preferred
Units so surrendered.

     (d) The Partnership further covenants that any Common Units issued upon
conversion of the Series Z Preferred Units shall be validly issued, fully paid
and non-assessable.

     (e) The Assignee of any Limited Partner pursuant to Section 11 hereof
and/or Section 11 of the main part of the Partnership Agreement (and pursuant to
the terms of the Registration Rights and Lock-Up Agreement) may exercise the
rights of such Limited Partner pursuant to this Section 6, and such Limited
Partner shall be deemed to have assigned such rights to such Assignee and shall
be bound by the exercise of such rights by the Assignee.  In connection with any
exercise of such rights by an Assignee of a Limited Partner, the cash amount
shall be paid by the Partnership directly to such Assignee and not to such
Limited Partner.

     (f) An Optional Conversion Notice shall be provided in the manner provided
in Section 10.  Any defect in an Optional Conversion Notice or in the mailing
thereof to the Partnership shall not affect the sufficiency of the notice or the
validity of the proceedings for redemption with respect to the other holders.
Any notice that was mailed in the manner herein provided shall be conclusively
presumed to have been duly given on the date of deemed delivery provided in
Section 10, whether or not the holder receives the notice.

     (g) Each Series Z Preferred Unit holder covenants and agrees with the
Partnership that all Series Z Preferred Units delivered for conversion pursuant
to this Section 6 shall be delivered to the Partnership free and clear of all
liens, and, notwithstanding anything contained herein to the contrary, the
Partnership shall not be under any obligation to convert Series Z Preferred
Units which are subject to any liens.

     (h) Notwithstanding any thing to the contrary in the main part of the
Partnership Agreement, a holder of Series Z Preferred Units may deliver a
Redemption Notice pursuant to

                                       10
<PAGE>

Section 8.6A of the main part of the Partnership Agreement relating to those
Common Units that will be issued to such holder upon conversion of such Series Z
Preferred Units into Common Units in advance of the Option Strike Date or
Conversion Date, as applicable; provided, however, that the redemption of such
Common Units by the Partnership shall in no event take place until such Common
Units are issued upon the conversion of the Series Z Preferred Units pursuant to
either Section 6 or Section 7 hereof. For clarity, it is noted that the
objective of this paragraph is to put a holder in a position where, if he so
wishes, the Common Units into which his Series Z Preferred Units will be
converted can be redeemed by the Partnership simultaneously with such
conversion, with the further consequence that, if the Partnership elects to
satisfy its redemption obligation with respect to such Common Units under
Section 6A of the main part of the Partnership Agreement by delivering to
such holder Common Shares (as defined in the Registration Rights and Lock-Up
Agreement) rather than cash, then such holder will have such common Shares
issued to him simultaneously with the conversion of his Series Z Preferred Units
into Common Units, such that such holder can be in a position to sell such
Common Shares as contemplated by the Registration Rights and Lock-Up Agreement
or otherwise without delay. The General Partner shall cooperate with a holder of
Series Z Preferred Units to coordinate the timing of the different events
described in the foregoing sentence (including the calculation of the number of
Common Units into which such holder's Series Z Preferred Units will convert and
the mechanics of issuing and delivering Common Units and Common Shares) and
shall use commercially reasonable efforts to cause the conversion of such
holder's Series Z Preferred Units, the redemption of the Common Units issued
upon such conversion and the issuance of the Common Shares to be issued upon
such redemption, if applicable, to occur in such a manner as to accomplish the
objective described in the foregoing sentence.

     7.   Mandatory Automatic Conversion.
          ------------------------------

     (a) Unless redeemed by the Partnership pursuant to Section 5 hereof, or
previously converted at the election of the holders pursuant to Section 6
hereof, on the later of (a) February 11, 2002 (24 months from the Signing Date)
or (b) the expiration of the Lock-up (as defined in the Registration Rights and
Lock-Up Agreement) pursuant to Section 2(a) of the Registration Rights and Lock-
Up Agreement or (c) the earlier of either (i) the date upon which, pursuant to
and in accordance with the terms of the Registration Rights and Lock-Up
Agreement a Registration Statement (as defined therein) relating to all of the
Registrable Shares (as defined therein) has been declared effective by the
Securities and Exchange Commission, provided that the General Partner has given
at least five (5) trading days prior written notice to the holders of Series Z
Preferred Units that such declaration of effectiveness would be forthcoming on
such date or (ii) if such written notice has not been given at least five (5)
trading days prior to such a declaration of effectiveness, then the date that is
the fifth (5th) trading day after a written notice of such declaration of
effectiveness is given to the holders of Series Z Preferred Units by the General
Partner (the "Conversion Date"), each Series Z Preferred Unit that has not been
redeemed prior to such date pursuant to Section 5 hereof or converted pursuant
to Section 6 hereof shall automatically and without any notice or action being
required of the Partnership, the General Partner or any holder of Series Z
Preferred Units, be converted into a number of Common Unit(s) equal to the
greater of (i) one (1) multiplied by the Adjustment Factor or (ii) the

                                       11
<PAGE>

Liquidation Preference of each Series Z Preferred Unit held by such holder
divided by the Conversion Price.  Fractional Units shall be paid in dollars as
described in (c) below.

     (b) The conversion of all unredeemed Series Z Preferred Units shall occur
automatically at the close of business on the Conversion Date, without any
action on the part of the holders of Series Z Preferred Units or the
Partnership, and immediately after the close of business on such date any holder
of Series Z Preferred Units who had all or a portion of its Series Z Preferred
Units converted shall be credited on the books and records of the Partnership
with the issuance as of the opening of business on the next day of the Common
Units issuable upon such conversion.  The conversion shall be deemed to have
been effected immediately at the close of business on the Conversion Date, and
the Series Z Preferred Units shall be deemed converted into Common Units at the
close of business on such date.  After the conversion of Series Z Preferred
Units as aforesaid, the Partnership shall deliver to such holder, upon his
written request, a certificate of the General Partner certifying the number of
Common Units held by such person immediately after such conversion.
Notwithstanding anything in this Section 7 to the contrary, if within ten (10)
trading days after a Conversion Date the Company initiates a Suspension Period
(as defined in Section 8(c) of the Registration Rights and Lock-Up Agreement) or
an Offering Blackout Period (as defined in Section 8(d) of the Registration
Rights and Lock-Up Agreement), then immediately upon such event (a "Reconversion
Event"), and retroactive as of the Conversion Date, all Common Units issued to
holders of Series Z Preferred Units upon conversion pursuant to this Section 7
which continue to be held by such holders on the date of the Reconversion Event
(the "Reconversion Date") shall be deemed to have been reconverted into the
corresponding original number of Series Z Preferred Units held by such holder on
the Conversion Date prior to such conversion.  Following a Reconversion Event,
all provisions hereof (including without limitation this Section 7, including
without limitation this paragraph (b)) shall again apply to the Series Z
Preferred Units into which the Common Units shall have been reconverted to the
same extent as they applied before the original Conversion Date, except the new
Conversion Date shall be the business date immediately following the date on
which the Suspension Period or Offering Blackout Period, as applicable, ends, if
on such date the Registration Statement (as defined in the Registration Rights
and Lock-Up Agreement) is effective and available to holders of Registrable
Shares (as defined in the Registration Rights and Lock-Up Agreement) for resales
thereof.  For clarity, it is noted that the objective of the preceding sentence
is to provide for the application of all of the provisions of this Certificate
as to any and all Series Z Preferred Units that are reconverted in accordance
with this Section, including, without limitation, the terms for reconversion set
forth in this Section, such that any Series Z Preferred Units that are again
converted into Common Units after previous reconversion(s) in accordance with
this Section will be subject to a further reconversion in the event of another
subsequent Suspension Period or Offering Blackout Period within the time frame
set forth above.

     (c) No fractions of Common Units shall be issued upon conversion of the
Series Z Preferred Units.  Instead of any fractional interest in a Common Unit
that would otherwise be deliverable upon the conversion of Series Z Preferred
Units, the Partnership shall pay to the holder of such Series Z Preferred Units
within two Business Days of the Conversion Date by certified check to or on the
order of the holders of Series Z Preferred Units, an amount in cash based upon
the Current Market Price of Common Units on the Trading Day immediately

                                       12
<PAGE>

preceding the date of conversion, it being understood that if a holder has more
than one Series Z Preferred Unit, then the number of full Common Units issuable
upon conversion thereof shall be computed on the basis of the aggregate number
of Series Z Preferred Units held by such holder.

     (d)  (i)  The following events shall be "Adjustment Events": if the
               Partnership shall after the date hereof (A) make a distribution
               on its Common Units in Common Units, (B) subdivide its
               outstanding Common Units into a greater number of units, (C)
               combine its outstanding Common Units into a smaller number of
               units or (D) issue any units by reclassification of its Common
               Units.

          (ii) If one or more Adjustment Events occur between the Signing Date
               and the Redemption Date, Option Strike Date, or Conversion Date,
               as applicable, then on the Redemption Date, Option Strike Date,
               or Conversion Date, as applicable, the Adjustment Factor shall be
               recalculated once by using a single formula that takes into
               account each and every Adjustment Event as if all Adjustment
               Events occurred simultaneously the Redemption Date, Option Strike
               Date, or Conversion Date, as applicable, as described in clause
               (iii) of this Section 7(d).

        (iii)  With respect to each single Adjustment Event, the Adjustment
               Factor shall be recalculated by multiplying it by a fraction (A)
               the numerator of which shall be the number of Common Units
               outstanding immediately after giving effect to such Adjustment
               Event and (B) the denominator of which shall be the number of
               Common Units outstanding immediately before giving effect to such
               Adjustment Event.

          (iv) Notwithstanding any other provisions of this Section 7, the
               Partnership shall not be required to make any adjustment of the
               Adjustment Factor for the issuance of any Common Units pursuant
               to any employee benefit or compensation plan or other plan
               providing for the reinvestment of distributions or interest
               payable on securities of the Partnership and the investment of
               additional optional amounts in Common Units under such plan (or
               the issuance of any Common Units to the Company in respect of a
               capital contribution by it resulting from an analogous sale of
               its securities). All calculations under this Section 7 shall be
               made to the nearest cent with $.005 being rounded upward) or to
               the nearest one-tenth of a Unit (with .05 of a Unit being rounded
               upward), as the case may be.

     (e) If the Partnership shall be a party to any transaction (including
without limitation a merger, consolidation, unit exchange, self tender offer for
all or substantially all Common Units or sale of all or substantially all of the
Partnership's assets, but excluding any transaction which constitutes an
Adjustment Event for purposes of paragraph (d) of this Section 7) (each of the
foregoing being referred to herein as a "Transaction"), in each case as a result
of which Common Units shall be converted into the right to receive securities or
other property (including cash or any combination thereof), each Series Z
Preferred Unit shall automatically be converted

                                       13
<PAGE>

into the right to receive in connection with such Transaction the kind and
amount of securities and other property (including cash or any combination
thereof) receivable upon the consummation of such Transaction by a holder of
that number of Common Units into which one Series Z Preferred Unit would have
been converted immediately prior to such Transaction pursuant to Section 6(a)
applied as of the effective date of such Transaction (assuming that such date
was the Option Strike Date), assuming such holder of Common Units (i) is not a
Person with which the Partnership consolidated or into which the Partnership
merged or which merged into the Partnership or to which such sale or transfer
was made, as the case may be (a "Constituent Person"), or an affiliate of a
Constituent Person and (ii) failed to exercise his or her rights of election, if
any, as to the kind or amount of securities and other property (including cash)
receivable upon such Transaction (provided that if the kind or amount of stock,
securities and other property (including cash) receivable upon such Transaction
is not the same for each Common Unit of the Partnership held immediately prior
to such Transaction by other than a Constituent Person or an affiliate thereof
and in respect of which such rights of election by such person shall not have
been exercised ("Non-Electing Unit"), then for the purpose of this paragraph (e)
the kind and amount of securities and other property (including cash) receivable
upon such Transaction by each Non-Electing Unit shall be deemed to be the kind
and amount so receivable per Unit by a plurality of the Non- Electing Units).

     (f) If the Adjustment Factor is adjusted as herein provided, the
Partnership shall promptly file in the books and records of the Partnership an
officer's certificate setting forth the Adjustment Factor after such adjustment
as required by the terms hereof and setting forth a brief statement of the facts
requiring such adjustment, which certificate shall be conclusive evidence of the
correctness of such adjustment absent manifest error. Promptly after filing of
such certificate, the Partnership shall prepare a notice of such adjustment of
the Adjustment Factor setting forth the adjusted Adjustment Factor and the
effective date such adjustment becomes effective and shall mail such notice of
such adjustment of the Adjustment Factor to the holders of each Series Z
Preferred Unit at such holder's last address as shown on the records of the
Partnership.

     (g) In any case in which paragraph (d) of this Section 7 provides that an
adjustment shall become effective upon the occurrence of an Adjustment Event,
the Partnership may defer until the occurrence of such event (A) issuing to the
holder of any Series Z Preferred Unit converted before the occurrence of such
event the additional Common Units issuable upon such conversion by reason of the
adjustment required by such event over and above the Common Units issuable upon
such conversion before giving effect to such adjustment and (B) paying to such
holder any amount of cash in lieu of any fractional Common Unit.

     (h) There shall be no adjustment of the Adjustment Factor in case of the
issuance of any Units in a financing, reorganization, acquisition or other
similar business transaction except as specifically set forth in this Section 7.
If any action would require adjustment of the Adjustment Factor pursuant to more
than one paragraph of this Section 7, only one adjustment shall be made, and
such adjustment shall be the amount of adjustment that has the highest absolute
value.

                                       14
<PAGE>

     (i) If the Partnership shall take any action affecting the Common Units,
other than action described in this Section 7, that in the opinion of the
General Partner would materially adversely affect the conversion rights of the
holders of the Series Z Preferred Units, the Adjustment Factor may be adjusted,
to the extent permitted by law, in such manner, if any, and at such time, as the
General Partner, in its sole discretion, may determine to be equitable in the
circumstances.

     (j) The Assignee of any Limited Partner pursuant to Section 11 hereof
and/or Section 11 of the main part of the Partnership Agreement (and pursuant to
the terms of the Registration Rights and Lock-Up Agreement) may exercise the
rights of such Limited Partner pursuant to this Section 7, and such Limited
Partner shall be deemed to have assigned such rights to such Assignee and shall
be bound by the exercise of such rights by the Assignee.  In connection with any
exercise of such rights by an Assignee of a Limited Partner, the cash amount
shall be paid by the Partnership directly to such Assignee and not to such
Limited Partner.

     (k) Notwithstanding any thing to the contrary in the main part of the
Partnership Agreement, a holder of Series Z Preferred Units may deliver a
Redemption Notice pursuant to Section 8.6A of the main part of the Partnership
Agreement relating to those Common Units that will be issued to such holder upon
conversion of such Series Z Preferred Units into Common Units in advance of the
Option Strike Date or Conversion Date, as applicable; provided, however, that
the redemption of such Common Units by the Partnership shall in no event take
place until such Common Units are issued upon the conversion of the Series Z
Preferred Units pursuant to either Section 6 or Section 7 hereof.   For clarity,
it is noted that the objective of this paragraph is to put a holder in a
position where, if he so wishes, the Common Units into which his Series Z
Preferred Units will be converted can be redeemed by the Partnership
simultaneously with such conversion, with the further consequence that, if the
Partnership elects to satisfy its redemption obligation with respect to such
Common Units under Section 6A of the main part of the Partnership Agreement
by delivering to such holder Common Shares (as defined in the Registration
Rights and Lock-Up Agreement) rather than cash, then such holder will have such
Common Shares issued to him simultaneously with the conversion of his Series Z
Preferred Units into Common Units, such that such holder can be in a position to
sell such Common Shares as contemplated by the Registration Rights  and Lock-Up
Agreement or otherwise without delay. The General Partner shall cooperate with a
holder of Series Z Preferred Units to coordinate the timing of the different
events described in the foregoing sentence (including the calculation of the
number of Common Units into which such holder's Series Z Preferred Units will
convert and the mechanics of issuing and delivering Common Units and Common
Shares) and shall use commercially reasonable efforts to cause the conversion of
such holder's Series Z Preferred Units, the redemption of the Common Units
issued upon such conversion and the issuance of the Common Shares to be issued
upon such redemption, if applicable, to occur in such a manner as to accomplish
the objective described in the foregoing sentence.

     The Partnership further covenants that any Common Units issued upon
conversion or redemption of the Series Z Preferred Units shall be validly
issued, fully paid and non-assessable.

     8.   Voting Rights.

                                       15
<PAGE>

     (a) Holders of the Series Z Preferred Units will (a) have those voting
rights from time to time required by law, (b) have the same voting rights as a
holder of Common Units has under the main part of the Partnership Agreement,
voting as a single class with the Common Units, with each Series Z Preferred
Unit being treated as one (1) Common Unit for purposes of any such vote, and (c)
have those additional voting rights that are set forth below.

     (b) So long as any Series Z Preferred Units remain outstanding, the
Partnership shall not, without the affirmative vote of the holders of at least a
majority of the Series Z Preferred Units outstanding at the time, given in
person or by proxy, either in writing or at a meeting (voting separately as a
class), amend, alter or repeal the provisions of the Partnership Agreement,
whether by merger, consolidation or otherwise, so as to materially and adversely
affect any right, preference, privilege or voting power of the Series Z
Preferred Units or the holders thereof in their capacity as holders of Series Z
Preferred Units, unless such amendment, alteration, or repeal affects equally,
ratably and proportionately the rights, privileges and voting powers of the
holders of Common Units; but subject, in any event, to the following provisions:

          (i)  With respect to the occurrence of any merger, consolidation or
               other business combination or reorganization, so long as the
               Series Z Preferred Units are treated in accordance with paragraph
               (e) of Section 7 hereof, the occurrence of any such event shall
               not be deemed to materially and adversely affect such rights,
               preferences, privileges or voting powers of the holders of the
               Series Z Preferred Units.

          (ii) Any creation or issuance of any Common Units or of any class or
               series of Preferred Units, whether ranking senior to, junior to,
               or on a parity with the Series Z Preferred Units with respect to
               the payment of distributions and the distribution of assets upon
               liquidation, dissolution or winding up, shall not be deemed to
               materially and adversely affect such rights, preferences,
               privileges or voting powers of the holders of the Series Z
               Preferred Units.

     (c) The foregoing voting provisions will not apply if, at or prior to the
time when the act, with respect to which such vote would otherwise be required,
will be effected, all outstanding Series Z Preferred Units shall have been
redeemed or converted.

     9.   Ranking.  The Series Z Preferred Units shall rank junior to all other
classes or series of Units of the Partnership whether now authorized or
outstanding or hereafter created, authorized or issued, except that (a) as to
distribution of assets upon liquidation, dissolution or winding up, the Series Z
Preferred Units shall rank senior to the Common Units, (b) as to the payment of
distributions, during the Half Distribution Period and any Full Distribution
Period, the Series Z Preferred Units shall rank pari passu with the Common
Units, and (c) as to the payment of distributions and as to distribution of
assets upon liquidation, dissolution or winding up, any class or series which by
its terms specifies that it shall rank junior ("Junior Units") to or on a parity
("Parity Units") with Series Z Preferred Units shall rank junior or pari passu,
as the case may be with the Series Z Preferred Units.

                                       16
<PAGE>

     10.  Notices.  All notices, demand, requests or other communications which
may be or are required to be given, served or sent hereunder will be in writing
and delivered by certified U.S. mail, return receipt required, with postage
prepaid, or by nationally recognized overnight courier service that provides
tracking and proof of receipt.  Notices shall be deemed delivered upon the
earlier of (i) delivery, (ii) refusal of delivery by addressee, (iii) two
Business Days after deposit in the U.S. Mails in the case of certified U.S.
mail, or (iv) one Business Day after deposit with a nationally recognized
overnight courier.  Notices to Series Z Preferred Unitholders shall be sent to
their address of record with the Partnership.  Any Series Z Preferred Unitholder
may change its address of record by written notice as given as aforesaid.
Notices delivered to the Partnership shall be addressed to Boston Properties
Limited Partnership, Attn.: Chief Financial Officer, 800 Boylston Street, Suite
400, Boston, MA 02199-8001 or to such other address as the Partnership may have
notified holders in the manner provided in this Section 10.

     11.  Transfers.  Subject to the terms of the Registration Rights and Lock-
Up Agreement, a holder of Series Z Preferred Units shall be entitled to transfer
such Series Z Preferred Units to the same extent that holders of Common Units
are entitled to transfer their Common Units pursuant to Article 11 of the main
part of the Partnership Agreement.

                                       17
<PAGE>

     IN WITNESS WHEREOF, Boston Properties, Inc., as General Partner of the
Partnership, has caused this Certificate of Designations to become effective,
and the Partnership Agreement is hereby amended by giving effect to the terms
set forth herein.

                                  BOSTON PROPERTIES, INC.

                                  By:_________________________________
                                     Name:
                                     Title:
                                     Date: December __, 2000

                                       18
<PAGE>

                                   Exhibit A
                                   ---------
                   to the Certificate of Designations for the
                            Series Z Preferred Units

                    NOTICE OF ELECTION BY PARTNER TO CONVERT
                   SERIES Z PREFERRED UNITS INTO COMMON UNITS

     The undersigned Series Z Preferred Unitholder hereby irrevocably (i) elects
to convert the number of Series Z Preferred Units in Boston Properties Limited
Partnership (the "Partnership") set forth below into Common Units in accordance
with the terms of the Second Amended and Restated Agreement of Limited
Partnership of the Partnership and the Certificate of Designations relating to
the Series Z Preferred Units that is a part thereof; and (ii) directs that any
cash in lieu of Common Units that may be deliverable upon such conversion be
delivered to the address specified below.  The undersigned hereby represents,
warrants, and certifies that the undersigned (a) has title to such Series Z
Preferred Units, free and clear of the rights or interests of any other person
or entity other than the Partnership; (b) has the full right, power, and
authority to cause the conversion of such Series Z Preferred Units as provided
herein; and (c) has obtained the consent or approval of all persons or entities,
if any, having the right to consent or approve such conversion.

Name of Series Z Preferred Unit holder:_____________________________________
                       (Please Print: Exact Name as Registered with Partnership)

Date of this Notice:

                                       _________________________________________
                                       (Signature of Limited Partner: Sign Exact
                                       Name as Registered with Partnership)

                                       _________________________________________
                                       (Street Address)

                                       _________________________________________
                                       (City)                (State)  (Zip Code)

                                       Signature Guaranteed by:

                                       _________________________________________

                                       19

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