Document:

First Amendment to Senior Executive Severance Plan

 EXHIBIT 10.13 
 FIRST AMENDMENT 
 TO 
 BOSTON PROPERTIES, INC. 
 SENIOR EXECUTIVE SEVERANCE PLAN 
 A. The Boston Properties, Inc. Senior Executive Severance Plan, as adopted as of July 30, 1998 (the “Plan”), is hereby amended as follows:

 1. Section 1 of the Plan is hereby amended by adding the term “the President,” before the reference to “the Executive
Vice-Presidents” in the third sentence thereof. 
 2. Section 5(b) of the Plan is hereby amended by deleting the third sentence
thereof and substituting therefor the following: 
 “The initial Gross-Up Payment, if any, as determined pursuant to this
Section 5(b), shall be paid as withholding taxes to the taxing authorities on behalf of the Covered Employee at such time or times when the Excise Tax is due.” 
 3. The Plan is hereby further amended by adding the following Section 16 at the end thereof: 
 “16. Section 409A. Notwithstanding anything to the contrary in the foregoing, if at the time of Covered Employee’s separation from service within the meaning of Section 409A of the Internal Revenue Code of 1986,
as amended (the ‘Code’), the Covered Employee is considered a ‘specified employee’ within the meaning of Section 409A(a)(2)(B)(i) of the Code, and if any payment or benefit that the Covered Employee becomes entitled to under
this Plan would be considered deferred compensation subject to interest, penalties and additional tax imposed pursuant to Section 409A(a) of the Code as a result of the application of Section 409A(a)(2)(B)(i) of the Code, then no such
payment or benefit shall be payable or provided prior to the date that is the earlier of (i) six months and one day after the Covered Employee’s separation from service, or (ii) the Covered Employee’s death. Any such deferred
payment shall earn simple interest calculated at the short-term applicable federal rate in effect on the Date of Termination. On or before the Covered Employee’s Date of Termination, the Company shall make an irrevocable contribution to a rabbi
trust with an independent bank trustee in an amount equal to the amount of such deferred payment plus interest.” 
  

 B. Except as amended hereby, the Plan shall remain in full force and effect. 
 IN WITNESS WHEREOF, this First Amendment has been executed on behalf of the Company by its duly
authorized officer this 18th day of October, 2007. 
 BOSTON PROPERTIES, INC. 
 By:  /s/  E. Mitchell
Norville                 
         Name: E. Mitchell Norville 
         Title: Executive Vice President, 
                   Chief Operating Officer 
  

 2First Amendment to Executive Severance Plan

 EXHIBIT 10.14 
 FIRST AMENDMENT 
 TO 
 BOSTON PROPERTIES, INC. 
 EXECUTIVE SEVERANCE PLAN 
 A. The Boston Properties, Inc. Executive Severance Plan, as adopted as of July 30, 1998 (the “Plan”), is hereby amended as follows:

 1. Section 5(b) of the Plan is hereby amended by deleting the third sentence thereof and substituting therefor the following:

 “The initial Gross-Up Payment, if any, as determined pursuant to this Section 5(b), shall be paid as withholding
taxes to the taxing authorities on behalf of the Covered Employee at such time or times when the Excise Tax is due.” 
 2. The Plan is
further amended by adding the following Section 16 at the end thereof: 
 “16. Section 409A.
Notwithstanding anything to the contrary in the foregoing, if at the time of Covered Employee’s separation from service within the meaning of Section 409A of the Internal Revenue Code of 1986, as amended (the ‘Code’), the Covered
Employee is considered a ‘specified employee’ within the meaning of Section 409A(a)(2)(B)(i) of the Code, and if any payment or benefit that the Covered Employee becomes entitled to under this Agreement would be considered deferred
compensation subject to interest, penalties and additional tax imposed pursuant to Section 409A(a) of the Code as a result of the application of Section 409A(a)(2)(B)(i) of the Code, then no such payment or benefit shall be payable or
provided prior to the date that is the earlier of (i) six months and one day after the Covered Employee’s separation from service, or (ii) the Covered Employee’s death. Any such deferred payment shall earn simple interest
calculated at the short-term applicable federal rate in effect on the Date of Termination. On or before the Covered Employee’s Date of Termination, the Company shall make an irrevocable contribution to a rabbi trust with an independent bank
trustee in an amount equal to the amount of such deferred payment plus interest.” 
 B. Except as amended hereby, the Plan shall remain
in full force and effect. 
  

 IN WITNESS WHEREOF, this First Amendment has been
executed on behalf of the Company by its duly authorized officer this 18th day of October, 2007. 
 BOSTON PROPERTIES, INC. 
 By:  /s/  Douglas T. Linde                 
         Name: Douglas T. Linde 
         Title: President 
  

 2OFFICER SEVERANCE PLAN

 Exhibit 10.15 
 BOSTON PROPERTIES, INC. 
 Officer Severance Plan 
 1. Purpose. Boston Properties, Inc. (the “Company”) considers it essential to the best interests of its stockholders to foster the
continuous employment of key management personnel. The Board of Directors of the Company (the “Board”) recognizes, however, that, as is the case with many publicly held corporations, the possibility of a Change in Control (as defined in
Section 2 hereof) exists and that such possibility, and the uncertainty and questions which it may raise among management, may result in the departure or distraction of management personnel to the detriment of the Company and its stockholders.
Therefore, the Board has determined that the Boston Properties, Inc. Officer Severance Plan (the “Plan”) should be adopted to reinforce and encourage the continued attention and dedication of the Vice Presidents with less than ten
(10) years of service with the Company (each, a “Covered Employee”; collectively, the “Covered Employees”), to their assigned duties without distraction in the face of potentially disturbing circumstances arising from the
possibility of a Change in Control. Nothing in this Plan shall be construed as creating an express or implied contract of employment and, except as otherwise agreed in writing between the Covered Employee and the Company or any of its subsidiaries
or affiliates (together with the Company, the “Employers”), the Covered Employee shall not have any right to be retained in the employ of the Employers. 
 2. Change in Control. For purposes of this Plan, a “Change in Control” shall mean the occurrence of any one of the following events: 
 (a) any “person,” as such term is used in Sections 13(d) and 14(d) of the Act (other than any of the Employers,
Mortimer B. Zuckerman, Edward H. Linde, any “affiliate” or “associate” (as such terms are defined in Rule 12b-2 under the Act) of Mortimer B. Zuckerman or Edward H. Linde, or any trustee,
fiduciary or other person or entity holding securities under any employee benefit plan or trust of any of the Employers), together with all “affiliates” and “associates” (as such terms are defined in Rule 12b-2
under the Act) of such person, shall become the “beneficial owner” (as such term is defined in Rule 13d-3 under the Act), directly or indirectly, of securities of the Company representing 25 percent or more of the combined voting
power of the Company’s then outstanding securities having the right to vote in an election of the Company’s Board of Directors (“Voting Securities”) (other than as a result of an acquisition of securities directly from the
Company); provided that for purposes of determining the “beneficial ownership” (as such term is defined in Rule 13d-3 under the Act) of any “group” of which Mortimer B. Zuckerman, Edward H. Linde or any of
their affiliates or associates is a member (each such entity or individual, a “Related Party”), there shall not be attributed to the “beneficial ownership” (as such term is defined in Rule 13d-3 under the Act) of such
group any shares beneficially owned by any Related Party; or 
 (b) persons who, as of the effective date of the
Company’s initial public offering of Stock, constitute the Company’s Board of Directors (the “Incumbent 

 
Directors”) cease for any reason, including, without limitation, as a result of a tender offer, proxy contest, merger or similar transaction, to
constitute at least a majority of the Board, provided that any person becoming a director of the Company subsequent to such date shall be considered an Incumbent Director if such person’s election was approved by or such person was nominated
for election by either (A) a vote of at least two-thirds of the Incumbent Directors or (B) a vote of at least a majority of the Incumbent Directors who are members of a nominating committee comprised, in the majority, of Incumbent
Directors; or 
 (c) the stockholders of the Company shall approve (A) any consolidation or merger of the Company where
the stockholders of the Company, immediately prior to the consolidation or merger, would not, immediately after the consolidation or merger, “beneficially own” (as such term is defined in Rule 13d-3 under the Act), directly or
indirectly, shares representing in the aggregate 60 percent or more of the voting shares of the corporation issuing cash or securities in the consolidation or merger (or of its ultimate parent corporation, if any), (B) any sale, lease, exchange
or other transfer to an unrelated party (in one transaction or a series of transactions contemplated or arranged by any party as a single plan) of all or substantially all of the assets of the Company or (C) any plan or proposal for the
liquidation or dissolution of the Company. 
 Notwithstanding the foregoing, a “Change of Control” shall not be deemed to have
occurred for purposes of the foregoing clause (a) solely as the result of an acquisition of securities by the Company which, by reducing the number of shares of Voting Securities outstanding, increases the proportionate number of shares of
Voting Securities beneficially owned by any person (as defined in the foregoing clause (a)) to 25 percent or more of the combined voting power of all then outstanding Voting Securities; provided, however, that if such person shall
thereafter become the beneficial owner of any additional shares of Voting Securities (other than pursuant to a stock split, stock dividend, or similar transaction or as a result of an acquisition of securities directly from the Company), then a
“Change of Control” shall be deemed to have occurred for purposes of the foregoing clause (a). 
 3. Terminating
Event. A “Terminating Event” shall mean the termination of employment of a Covered Employee in connection with any of the events provided in this Section 3 occurring within twelve (12) months following a Change in Control:

 (a) termination by the Employers of the employment of the Covered Employee with the Employers for any reason other than for
Cause or the death or disability (as determined under the Employers’ then existing long-term disability coverage) of such Covered Employee. “Cause” shall mean, and shall be limited to, the occurrence of any one or more of the
following events: 
 (i) a willful act of dishonesty by the Covered Employee with respect to any matter involving any of the
Employers; or 
 (ii) conviction of the Covered Employee of a crime involving moral turpitude; or 
  

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 (iii) the deliberate or willful failure by the Covered Employee (other than by reason of
the Covered Employee’s physical or mental illness, incapacity or disability) to substantially perform the Covered Employee’s duties with the Employers and the continuation of such failure for a period of 30 days after delivery by the
Employers to the Covered Employee of written notice specifying the scope and nature of such failure and their intention to terminate the Covered Employee for Cause. 
 A Terminating Event shall not be deemed to have occurred pursuant to this Section 3(a) solely as a result of the Covered Employee
being an employee of any direct or indirect successor to the business or assets of either of the Employers, rather than continuing as an employee of the Employers following a Change in Control. For purposes of clauses (i) and (iii) of this
Section 3(a), no act, or failure to act, on the Covered Employee’s part shall be deemed “willful” unless done, or omitted to be done, by the Covered Employee without reasonable belief that the Covered Employee’s act, or
failure to act, was in the best interest of the Employers; or 
 (b) termination by the Covered Employee of the Covered
Employee’s employment with the Employers for Good Reason. “Good Reason” shall mean the occurrence of any of the following events: 
 (i) a substantial adverse change in the nature or scope of the Covered Employee’s responsibilities, authorities, title, powers, functions, or duties from the responsibilities, authorities, powers, functions, or
duties exercised by the Covered Employee immediately prior to the Change in Control; or 
 (ii) a reduction in the Covered
Employee’s annual base salary as in effect on the date hereof or as the same may be increased from time to time except for across-the-board salary reductions similarly affecting all or substantially all management employees; or 
 (iii) the relocation of the Employers’ offices at which the Covered Employee is principally employed immediately prior to the date
of a Change in Control to a location more than thirty (30) miles from such offices, or the requirement by the Employers for the Covered Employee to be based anywhere other than the Employers’ offices at such location, except for required
travel on the Employers’ business to an extent substantially consistent with the Covered Employee’s business travel obligations immediately prior to the Change in Control; or 
 (iv) the failure by the Employers to pay to the Covered Employee any portion of his compensation or to pay to the Covered Employee any
portion of an installment of deferred compensation under any deferred compensation program of the Employers within fifteen (15) days of the date such compensation is due without prior written consent of the Covered Employee; or 
  

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 (v) the failure by the Employers to obtain an effective agreement from any successor to
assume and agree to perform this Agreement. 
 4. Special Termination Benefits. In the event a Terminating Event occurs within twelve
(12) months after a Change in Control with respect to a Covered Employee, 
 (a) the Employers shall pay to the Covered
Employee an amount equal to the sum of the following: 
 (i) one (1) times the amount of the current annual base salary
of the Covered Employee, determined prior to any reductions for pre-tax contributions to a cash or deferred arrangement or a cafeteria plan; and 
 (ii) one (1) times the amount of the average annual bonus earned by the Covered Employee with respect to the three (3) calendar years immediately prior to the Change in Control. 
 Said amount shall be paid in one lump sum payment no later than thirty-one (31) days following the Date of Termination (as such term
is defined in Section 7(b)); and 
 (b) the Employers shall continue to provide health, dental and life insurance to the
Covered Employee, on the same terms and conditions as though the Covered Employee had remained an active employee, for twelve (12) months after the Terminating Event; and 
 (c) the Employers shall provide COBRA benefits to the Covered Employee following the end of the period referred to in Section 4(b)
above, such benefits to be determined as though the Covered Employee’s employment had terminated at the end of such period; and 
 (d) the Employers shall pay to the Covered Employee all reasonable legal and mediation fees and expenses incurred by the Covered Employee in obtaining or enforcing any right or benefit provided by this Plan, except in cases involving
frivolous or bad faith litigation initiated by the Covered Employee; and 
 (e) the Employers shall provide to the Covered
Employee financial counseling, tax preparation assistance and outplacement counseling for twelve (12) months after the Terminating Event. 
 Notwithstanding the foregoing, the special termination benefits required by Section 4(a) shall be offset by any amount paid or payable to the Covered Employee by the Employers under the terms of any employment agreement or other plan.

  

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 5. Additional Limitation. 
 (a) Anything in this Plan to the contrary notwithstanding, in the event that any compensation, payment or distribution by the Employers to
or for the benefit of the Covered Employee, whether paid or payable or distributed or distributable pursuant to the terms of this Plan or otherwise, (the “Severance Payments”), would be subject to the excise tax imposed by
Section 4999 of the Internal Revenue Code of 1986, as amended (the “Code”), the following provisions shall apply: 
 (i) If the Severance Payments, reduced by the sum of (1) the Excise Tax and (2) the total of the Federal, state, and local income and employment taxes payable by the Covered Employee on the amount of the Severance Payments which
are in excess of the Threshold Amount, are greater than or equal to the Threshold Amount, the Covered Employee shall be entitled to the full benefits payable under this Plan. 
 (ii) If the Threshold Amount is less than (x) the Severance Payments, but greater than (y) the Severance Payments reduced by
the sum of (1) the Excise Tax and (2) the total of the Federal, state, and local income and employment taxes on the amount of the Severance Payments which are in excess of the Threshold Amount, then the benefits payable under this Plan
shall be reduced (but not below zero) to the extent necessary so that the maximum Severance Payments shall not exceed the Threshold Amount. To the extent that there is more than one method of reducing the payments to bring them within the Threshold
Amount, the Covered Employee shall determine which method shall be followed; provided that if the Covered Employee fails to make such determination within 45 days after the Employers have sent the Covered Employee written notice of the need for such
reduction, the Employers may determine the amount of such reduction in its sole discretion. 
 For the purposes of this Section 5,
“Threshold Amount” shall mean three times the Covered Employee’s “base amount” within the meaning of Section 280G(b)(3) of the Code and the regulations promulgated thereunder less one dollar ($1.00); and “Excise
Tax” shall mean the excise tax imposed by Section 4999 of the Code, or any interest or penalties incurred by the Covered Employee with respect to such excise tax. 
 (b) The determination as to which of the alternative provisions of Section 5(a) shall apply to the Covered Employee shall be made by
Coopers & Lybrand, L.L.P. or any other nationally recognized accounting firm selected by the Employers (the “Accounting Firm”), which shall provide detailed supporting calculations both to the Employers and the Covered Employee
within 15 business days of the Date of Termination, if applicable, or at such earlier time as is reasonably requested by the Employers or the Covered Employee. For purposes of determining which of the alternative provisions of Section 5(a)
shall apply, the Covered Employee shall be deemed to pay federal income taxes at the highest marginal rate of federal income taxation applicable to individuals for the calendar year in which the determination is to be made, and state and local
income taxes 

  

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at the highest marginal rates of individual taxation in the state and locality of the Covered Employee’s residence on the Date of Termination, net of
the maximum reduction in federal income taxes which could be obtained from deduction of such state and local taxes. Any determination by the Accounting Firm shall be binding upon the Employers and the Covered Employee. 
 6. Withholding. All payments made by the Employers under this Plan shall be net of any tax or other amounts required to be withheld by the
Employers under applicable law. 
 7. Notice and Date of Termination; Disputes; Etc. 
 (a) Notice of Termination. Within twelve (12) months after a Change in Control, any purported termination of a Covered
Employee’s employment (other than by reason of death) shall be communicated by written Notice of Termination from the Employers to the Covered Employee or vice versa in accordance with this Section 7. For purposes of this Plan, a
“Notice of Termination” shall mean a notice which shall indicate the specific termination provision in this Plan relied upon and the Date of Termination. Further, a Notice of Termination for Cause is required to include a copy of a
resolution duly adopted by the affirmative vote of not less than two-thirds (2/3) of the entire membership of the Board at a meeting of the Board (after reasonable notice to the Covered Employee and an opportunity for the Covered Employee,
accompanied by the Covered Employee’s counsel, to be heard before the Board) finding that, in the good faith opinion of the Board, the termination met the criteria for Cause set forth in Section 3(a) hereof. 
 (b) Date of Termination. “Date of Termination,” with respect to any purported termination of a Covered Employee’s
employment within twelve (12) months after a Change in Control, shall mean the date specified in the Notice of Termination. In the case of a termination by the Employers other than a termination for Cause (which may be effective immediately),
the Date of Termination shall not be less than 30 days after the Notice of Termination is given. In the case of a termination by a Covered Employee, the Date of Termination shall not be less than 15 days from the date such Notice of Termination is
given. Notwithstanding Section 3(a) of this Plan, in the event that a Covered Employee gives a Notice of Termination to the Employers, the Employers may unilaterally accelerate the Date of Termination and such acceleration shall not result in a
second Terminating Event for purposes of Section 3(a) of this Plan. 
 (c) No Mitigation. The Covered Employee is
not required to seek other employment or to attempt in any way to reduce any amounts payable to the Covered Employee by the Employers under this Plan. Further, the amount of any payment provided for in this Plan shall not be reduced by any
compensation earned by the Covered Employee as the result of employment by another employer, by retirement benefits, by offset against any amount claimed to be owed by the Covered Employee to the Employers, or otherwise. 
  

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 (d) Mediation of Disputes. The parties shall endeavor in good faith to settle
within 90 days any controversy or claim arising out of or relating to this Plan or the breach thereof through mediation with JAMS, Endispute or similar organizations. If the controversy or claim is not resolved within 90 days, the parties shall be
free to pursue other legal remedies in law or equity. 
 8. Benefits and Burdens. This Plan shall inure to the benefit of and be
binding upon the Employers and the Covered Employees, their respective successors, executors, administrators, heirs and permitted assigns. In the event of a Covered Employee’s death after a Terminating Event but prior to the completion by the
Employers of all payments due him under this Plan, the Employers shall continue such payments to the Covered Employee’s beneficiary designated in writing to the Employers prior to his death (or to his estate, if the Covered Employee fails to
make such designation). 
 9. Enforceability. If any portion or provision of this Plan shall to any extent be declared illegal or
unenforceable by a court of competent jurisdiction, then the remainder of this Plan, or the application of such portion or provision in circumstances other than those as to which it is so declared illegal or unenforceable, shall not be affected
thereby, and each portion and provision of this Plan shall be valid and enforceable to the fullest extent permitted by law. 
 10.
Waiver. No waiver of any provision hereof shall be effective unless made in writing and signed by the waiving party. The failure of any party to require the performance of any term or obligation of this Plan, or the waiver by any party of any
breach of this Plan, shall not prevent any subsequent enforcement of such term or obligation or be deemed a waiver of any subsequent breach. 
 11. Notices. Any notices, requests, demands, and other communications provided for by this Plan shall be sufficient if in writing and delivered in person or sent by registered or certified mail, postage prepaid, to a Covered Employee
at the last address the Covered Employee has filed in writing with the Employers, or to the Employers at their main office, attention of the Board of Directors. 
 12. Effect on Other Plans. Nothing in this Plan shall be construed to limit the rights of the Covered Employees under the Employers’ benefit plans, programs or policies. 
 13. Amendment or Termination of Plan. The Company may amend or terminate this Plan at any time or from time to time; provided, however, that no
such amendment shall, without the consent of the Covered Employees, in any material adverse way affect the rights of the Covered Employees, and no termination shall be made without the written consent of the Covered Employees. 
 14. Governing Law. This Plan shall be construed under and be governed in all respects by the laws of the Commonwealth of Massachusetts.

  

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 15. Obligations of Successors. In addition to any obligations imposed by law upon any successor to
the Employers, the Employers will use their best efforts to require any successor (whether direct or indirect, by purchase, merger, consolidation or otherwise) to all or substantially all of the business or assets of the Employers to expressly
assume and agree to perform this Plan in the same manner and to the same extent that the Employers would be required to perform if no such succession had taken place. 
 Adopted: As of July 30, 1998 
  

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