Document:

Severance Agreement and Release of Claims

 Exhibit 10.22 
  
 SEVERANCE AGREEMENT AND RELEASE OF CLAIMS 
  
 This Severance Agreement and Release of Claims (“Agreement”) is entered into between Dresser, Ltd., a
Bermuda corporation (“DL”), Dresser, Inc., a Delaware corporation (“DI” and with DL, collectively, the “Company”) and Andrew E. Graves (“Employee”). 
  
 WHEREAS, Employee’s employment with the Company and each of its
affiliates will end effective May 15, 2005 (the “Termination Date”); and 
  
 WHEREAS, the Company and Employee wish to make special arrangements regarding Employee’s separation and to promote an orderly transition for both the Company and Employee. 
  
 NOW, THEREFORE, in consideration of the mutual promises and other
consideration described herein, the Company and Employee agree as follows: 
  
 1. Separation of Employment – The Company and Employee agree that Employee’s employment with the Company and any and all of the Company’s affiliates, including without limitation DL, will end on
the Termination Date, and that Employee has no right or expectation of reinstatement or rehire thereafter. 
  
 2. Severance – In exchange for the promises set forth in this Agreement and his Employment Agreement with the Company dated April 15,
2003 (hereinafter the “Employment Agreement”), and provided that there has been no breach by Employee of his obligations under this Agreement or his continuing obligations under the Employment Agreement, the Company will pay to
Employee the consideration set forth on Exhibit A hereto. 
  
 3. Mutual General Release (a) Employee, on behalf of himself and his heirs, executors, successors, and assigns, releases each of the Company, DEG Acquisitions LLC, First Reserve Corporation and each investment fund that it
manages or advises, First Reserve GP IX, Inc. and each investment fund that it manages or advises, Odyssey Investment Partners, LLC and each investment fund that it manages or advises, and each of their respective affiliates, agents, Employees,
representatives, officers, directors, trustees, subsidiaries, stockholders, and attorneys, and the successors and assigns of each (collectively referred to as the “Company Released Parties”) from any claim, counterclaim or other
action, whether known or unknown, against the Company Released Parties, that Employee has or may have arising under statute, common law, or otherwise (including, without limitation, any dispute relating to Employee’s employment with the Company
or his separation therefrom and any dispute arising under the Civil Rights Act of 1964 (as amended), Age Discrimination in Employment Act, the Americans with Disabilities Act, the Employee Retirement Income Security Act, and any similar state or
local law regulating the employment relationship) arising prior to the date of execution of this Agreement, whether as an employee, director, shareholder or otherwise; provided that nothing herein shall be deemed to release (i) any rights
Employee may have to indemnification from the Company under its certificate of incorporation, bylaws, or other agreements, or pursuant to the Employment Agreement, (ii) any rights Employee may have to directors’ and officers’
liability insurance coverage including but not limited to those rights specified in Section 7.10 of the Employment Agreement, (iii) any rights Employee may have to any benefits under any employee benefit program or plan of the Company
listed in Paragraph 3 of Exhibit A, (iv) any rights Employee may 

 
have to continuation of health care coverage under the Consolidated Omnibus Budget Reconciliation Act of 1985, as amended, or under Section 4980B of the
Internal Revenue Code or under ERISA Sections 601 through 609, (v) Employee’s rights under this Agreement, or (vi) Employee’s Retained Rights as defined and described in Section 3.7 of the Employment Agreement, as modified
by this Agreement. In addition, with respect to severance payments, and continued participation in employee benefit plans and programs, Employee acknowledges and agrees that this Agreement, including Exhibit A fully and completely resolves
all his rights under the Employment Agreement, and Article 4 of the Amended and Restated Investor Rights Agreement by and among DL and its shareholders, dated June 12, 2001, as amended (the “Investor Rights Agreement”).

  
 (b) The Company, on behalf of itself and DEG Acquisitions LLC,
First Reserve Corporation and each investment fund that it manages or advises, First Reserve GP IX, Inc. and each investment fund that it manages or advises, Odyssey Investment Partners, LLC and each investment fund that it manages or advises, and
each of their respective affiliates, agents, Employees, representatives, officers, directors, trustees, subsidiaries, stockholders, and attorneys, and the successors and assigns of each (the “Company Parties”) releases the Employee,
his heirs, executors, successors, and assigns, (collectively referred to as the “Employee Released Parties”) from any claim, counterclaim or other action, whether known or unknown, against the Employee Released Parties, that the
Company Parties have or may have arising under statute, common law, or otherwise (including, without limitation, any dispute relating to Employee’s employment with the Company or his separation therefrom and any similar state or local law
regulating the employment relationship) arising prior to the date of execution of this Agreement. The Company Parties’ release of the Employee Released Parties hereunder does not include any claim the Company may have against the Employee
arising from any criminal act or omission, or willful or intentional misconduct by the Employee. 
  
 4. Ownership and Protection of Intellectual Property and Confidential Information – The Company and Employee agree that during his employment,
Employee has received and become acquainted with confidential, proprietary, and/or trade secret information of the Company, its customers, and its affiliates. In consideration for the benefits conferred under this Agreement, Employee acknowledges
and reaffirms the confidentiality and related obligations previously agreed to in Article 4 of the Employment Agreement, the provisions of which are incorporated by reference herein. 
  
 5. Return of Company Property – Employee agrees that he will return all materials required to be returned by
Section 4.3 of the Employment Agreement by the Termination Date. 
  
 6. Subsidiary Boards – Employee agrees to resign from any Subsidiary Board positions effective on or before May 15, 2005. 
  
 7. Covenant Not to Compete; Return of Payments – Employee agrees Employee will be bound by the non-compete, non-solicit, noninterference, and
other obligations previously agreed to in Article 5 of the Employment Agreement (the “Non-Compete Obligations”), the provisions of which are incorporated by reference herein. Without waiving or impairing any rights the Company has
to injunctive relief or monetary damages for any breach of the Non-Compete Obligations, the parties agree that in the event of a willful and material breach of the 

  

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Non-Compete Obligations (a “Violation”), Employer shall cease severance payments as made pursuant to Article 3 of the Employment Agreement
and as listed in Exhibit A. The cessation of such payments pursuant to this provision shall not serve to limit in any way any damages that may be asserted and proven by the Company or any other remedies the Company may have for breach of the
Non-Compete Obligations, including injunctive relief. Any breach hereunder will be deemed willful if Employee fails to cure such breach to the extent curable, within ten (10) business days after receiving written notice thereof from the
Company. 
  
 8. Stock Options – The Company agrees
that all of Employee’s options to purchase 70,000 shares of Company are vested. The Employee’s right to put these vested options to the Company and the Company’s call rights regarding Employee’s options are detailed in the Steve
Lamb (President) letter to Employee dated April 15, 2003 re: Option Grants and Shareholder Issues (the “Lamb Letter”). Said letter is incorporated herein by reference. Paragraph 4 of Lamb letter is to be deleted and replaced with
following: vested options will expire if unexercised on March 15, 2006. 
  
 9. Put/Call Rights – Paragraph 5 of the Lamb Letter is hereby amended as follows: 
  
 The Company agrees not to call Employee’s options. Employee agrees that the put period shall be as follows: Employee’s put rights as described herein shall
expire on the earlier of February 15, 2006, or the date of the Company’s Initial Public Offering (“IPO”). A cashless option exercise will be made available to Employee in the event of an IPO. In the event a Company IPO has not
occurred prior to January 15, 2006, Employee shall have the right to put his options to the Company during the period beginning January 15, 2006 and ending February 15, 2006 Notwithstanding the foregoing, if the Company repurchases
Employee’s options pursuant to the put rights described herein, the repurchase price for each option will be calculated assuming an underlying share price of $65 per share (i.e. $25 net per share option). 
  
 10. Restricted Payments Basket – The Company represents, warrants
and covenants to Employee that there is an annual restricted payments basket under financing agreements between the Company and various lenders in effect as of the date of this Agreement, for the repurchase of equity (the “Basket”).
If payments due to Employee under Section 9 above, determined without regard to any amounts redeemed on or after the Put Notice, should exceed the amount the Company would be permitted to pay in one year to Employee subject to the Basket, the
Company shall pay the maximum permissible amount to Employee under the Basket immediately upon such amount becoming payable under Section 9, and shall pay the remaining balance due to Employee on the first day of the immediately following year
plus interest at the prime rate on such remaining balance from the date payment was due to Employee until payment is made. 
  
 11. Public Statements – The parties agree that this document shall be kept confidential, unless and until this document must be disclosed
according to the rules of, or filed with, the Securities and Exchange Commission or other governmental or self regulatory body; provided further that Employee may disclose the terms of this Agreement to his spouse, attorneys, financial and tax
advisors, governmental taxing bodies, and pursuant to lawful process. In the event this document must be disclosed or filed as referenced above, the Company will, to the 

  

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extent possible give the Employee the opportunity to review and comment on any such disclosure or filing. 
  
 12. Press Releases and Job References –The Company will, to the
extent practicable, give Employee the opportunity to review and comment on any press release or statement issued concerning his employment and termination. All job references for Employee shall be referred to Mr. Patrick Murray who shall
respond, in general, that Employee resigned from the Company due to changes in executive management and the impact of same upon Employee’s responsibilities due to business unit restructuring 
  
 13. No Admission – This Agreement shall not in any way be
construed as an admission by the Company or any Released Party that it has acted wrongfully with respect to Employee, or that Employee has any right to recover from the Company or any Released Party. 
  
 14. Successors and Assigns – This Agreement shall inure to the
benefit of and be binding upon the parties hereto and their respective heirs, successors, legal representatives, and assigns. However, neither this Agreement nor any right or duty hereunder shall be assignable by Employee, his beneficiaries, or
legal representatives. 
  
 15. Damages – The parties
hereto agree to waive any punitive damages arising from a breach of this Agreement. 
  
 16. Reformation – If any provision of this Agreement is determined to be invalid, illegal, or unenforceable, in whole or in part, neither the validity of the remaining parts of such provision nor the
validity of any other provision of this Agreement shall in any way be affected thereby. In lieu of such invalid, illegal, or unenforceable provision, there shall be added automatically as part of this Agreement a provision as similar in terms to
such invalid, illegal, or unenforceable provision as may be possible to be valid, legal, and enforceable. 
  
 17. No Mitigation – Employee shall have no obligation or duty to seek subsequent employment or engagement as an employee (including
self-employment) or as a consultant or otherwise mitigate the Company’s obligations under this Agreement. Payments and benefits due under this Agreement shall not be reduced by any compensation earned by Employee as an employee or consultant
from any employment or consulting arrangement after the Termination Date. 
  
 18. Governing Law – This Agreement shall be governed by the laws of the State of Delaware without giving affect to principles of conflicts of law. 
  
 19. Cooperation – After the Termination Date, Employee shall
cooperate with the Company, as the Company may reasonably request, in connection with any litigation, claim, or other dispute in which the Company is or may become a party; provided that any such cooperation or assistance requested shall not
unreasonably interfere or conflict with the obligations which Employee may have or owe to any other employer or to Employee’s personal affairs. The Company shall reimburse Employee for all reasonable out-of-pocket expenses incurred by Employee
in fulfilling Employee’s obligations under this 
  

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 20. Directors’ and Officers’ Liability Insurance – The Company will maintain
directors’ and officers’ liability insurance for Employee for a five (5) year period following the Termination Date at a level equivalent to the most favorable and protective coverage for any active officer or director of the
Company. 
  
 21. Approvals – The Company
represents and warrants to Employee that it has taken all corporate action necessary to authorize this Agreement. 
  
 22. Waiver – No waiver of any breach of any term, provision, or condition of this Agreement: (i) shall be effective unless it is in
writing, (ii) shall be construed or held to be an explicit or implicit waiver of, acquiescence in, or consent to any further or succeeding breach of the same term, provision or condition of this Agreement, or (iii) shall be construed or
held to be an explicit or implicit waiver of, acquiescence in, or consent to any breach of any other term, provision or condition of this Agreement. 
  
 23. Beneficiaries – If Employee dies prior to receiving all of the amounts payable to him in accordance with the terms of this Agreement, such
amounts shall be paid to one or more beneficiaries (“Beneficiaries”; each, a “Beneficiary”) designated by Employee in writing to the Company during his lifetime, or if no such Beneficiary is designated, to
Employee’s estate. Such payments shall be made in a lump sum to the extent so payable and, to the extent not payable in a lump sum, in accordance with the terms of this Agreement. Employee, without the consent of any prior Beneficiary, may
change his designation of Beneficiary or Beneficiaries at any time or from time to time by submitting to the Company a new designation in writing. 
  
 24. Captions and Counterparts – The names of the paragraphs of this Agreement are for convenience of reference only and do not constitute a
part hereof. This Agreement may be executed in counterparts, each of which shall be deemed an original, but all of which together will constitute one and the same instrument. 
  
 25. Dispute Resolution – Any dispute arising under this Agreement will be resolved pursuant to Section 7.7
of the Employment Agreement. 
  
 26. Attorney’s Fees
– Employee shall be reimbursed by the company for reasonable attorney’s fees and related expenses incurred in connection with this Agreement. The parties further agreeing that in no event will the Company reimburse more than $2,500.
under this paragraph. 
  
 27. Entire Agreement – In
executing this Agreement, Employee is not relying on any oral representation or statement by any employee, agent, or representative of the Company regarding the subject matter, basis, or effect of the Agreement. Rather, this Agreement, Articles 4
and 5 of the Employment Agreement, and other provisions of the Employment Agreement referenced in this Agreement, constitute the entire agreement between the parties with respect to the subject matter hereof and supersede all prior agreements with
respect to such matters. This Agreement may be modified or amended only by an instrument in writing signed by both parties hereto. 
  
 28. Knowing and Voluntary Agreement – Employee acknowledges that he has carefully read this Agreement in its entirety, that he fully
understands its provisions and its final 

  

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and binding effect, and that he is signing this Agreement voluntarily. Employee further acknowledges that he has been advised of his right to consult with an
attorney of his choosing prior to executing this Agreement. Employee has had the opportunity to have this Agreement in his possession for at least twenty-one days and has had that same period to consider whether to sign it. Employee may revoke this
Agreement within seven days of the date on which it is signed. After the expiration of such seven day period this Agreement will become effective and legally binding in all respects, with the first day after expiration of the revocation period being
the “Effective Date” for purposes of this Agreement. 
  
 [signatures follow] 
  

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 IN WITNESS WHEREOF, the Company and Employee have executed this Agreement as of the day and year
indicated below. 
  

									
	 	 	 	 	 Dresser, Ltd.

				
	 Dated:
                            
	 	 	 	By:	 	 
	 	 	 	 	 	 	 Name:
	 	 
	 	 	 	 	 	 	 Its:
	 	 
			
	 	 	 	 	 Dresser, Inc.

				
	 Dated:
                            
	 	 	 	 By:
	 	 
	 	 	 	 	 	 	 Name:
	 	 
	 	 	 	 	 	 	 Its:
	 	 
			
	 	 	 	 	 Employee

			
	 Dated:
                            
	 	 	 	 
	 	 	 	 	 	 	 Andrew E. Graves

  

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 EXHIBIT A 
  
 In consideration of the promises and obligations of Employee under the foregoing Agreement, the Company will provide the
following consideration: 
  
 1. A lump-sum payment of $184,669
less required deductions and withholdings and less any amounts already paid for periods subsequent to the Termination Date, payable no later than thirty (30) calendar days following the Agreement’s Effective Date, which consists of the
following: 
  

				
	 Accrued Amounts (Base Salary, Annual Bonus)
	  	$	0
	 Bonus for 2005
	  	$	67,594
	 Lump Sum Payment Under Company’s SERP
	  	$	117,075

  
 2. Continued periodic
payments of Employee’s base salary as in effect on the Termination Date and his Target Annual Bonus (based upon Employee’s last base salary amount on the Termination Date. As of the Termination Date Employee’s annual base salary was
$360,500 and Employee’s Target Bonus was 50% of base salary, or $180,250.) for each year during the severance term (as defined below) in accordance with Employer’s customary payroll practices during the period (the “Severance
Term”) commencing on the Termination Date and ending on the earlier of (A) the second anniversary of the Termination Date, or (B) the date Employee willfully and materially violates any of the covenants set forth in Article 4 or
Article 5 of Employment Agreement, or any provisions of this Severance Agreement (the “Severance Term”). 
  
 3. Continued participation in the following employee benefit plans and programs listed below for two (2) years, following the Agreement’s
Effective Date: Medical and Dental Insurance (provided Employee’s payments are made), 401K and associated non-qualified plans, if applicable, basic life insurance, continued participation in Paragon supplemental life insurance, Financial
Planning and country club dues for Raveneaux Country Club membership not to exceed $360/month (plus tax). Participation in all company sponsored benefit plans will terminate upon commencement of Employee’s participation in substantially
equivalent or better plans from a subsequent employer. Since Employee is responsible for the total premium paid under Employee’s Paragon supplemental life insurance plan such insurance plan will be transferred to Employee on the Termination
Date. 
  
 4. Under the terms of the Employee Agreement (3.5
(iii)), the Company is obligated to pay up to $20,000 for career transition services by a career transition assistance firm selected by Employee and reasonably acceptable to the Company. The parties acknowledge that this benefit remains in effect
under this Agreement and moreover, at Employee’s election, the amount dedicated for career transition services may be applied instead to Employee’s relocation expenses for a move back to the Chicago area. In no event will reimbursements
either for career transition services or relocation expenses, or both combined, exceed $20, 000. Further, in no event will relocation expenses be paid if similar expenses are paid under a relocation policy of a future employer. 
  

 8First Amendment of Lease

 Exhibit 10.1 
  
 FIRST AMENDMENT OF LEASE 
  
 This First Amendment of Lease (this “Amendment”) is made and entered into this 20th day of December, 2005 by and
between Rodger P. Nordblom and Peter C. Nordblom, as Trustees of N.W. Building 7 Trust under Declaration of Trust dated February 15, 2000 and filed with the Middlesex South Registry District of the Land Court as Document No. 1132636
(“Landlord”) and Gensym Corporation, a Delaware corporation (“Tenant”). 
  
 WITNESSETH 
  
 WHEREAS, Landlord and Tenant entered into a lease dated June 27, 2000 (the “Lease”), for premises containing approximately 27,250 square feet (the “Premises”) constituting the entire building located at 52
Second Avenue, Burlington, Massachusetts (the “Building”); and 
  
 WHEREAS, the term of the Lease is to expire on January 31, 2006; and 
  
 WHEREAS, Tenant desires, and Landlord has agreed, to extend the term of the Lease for an additional five (5) years and two (2) months, so
that the term shall expire March 31, 2011; and 
  
 WHEREAS, Tenant desires to surrender a portion of the Premises containing 10,322 square feet, such portion being identified on Exhibit A-1 attached hereto as the “Deleted Premises” (referred to herein as “Deleted
Premises”), and to continue to lease the portion of the Premises remaining after surrender of the Deleted Premises, such remaining portion containing 16,928 square feet, such portion being identified on Exhibit A-1 as the “New Premises
A” and the “New Premises B” (collectively, the “New Premises”); and 
  
 WHEREAS, Landlord has agreed to the surrender of the Deleted Premises; and 
  
 WHEREAS, Landlord and Tenant also desire to amend the Lease in
certain respects to reflect adjustments that must be made thereto as a result of the surrender of the Deleted Premises and the extension of the term of the Lease. 
  
 NOW THEREFORE, for and in consideration of the mutual agreements and undertakings contained herein, and for other
good and valuable consideration, the receipt and adequacy of which is hereby acknowledged, the parties agree as follows: 
  
 1.    The term of the Lease with respect only to the New Premises is hereby extended for a period of time commencing on
February 1, 2006 and expiring on March 31, 2011. Tenant shall have no further right under the Lease to extend the term thereof, and Section 2.3 of the Lease is hereby deleted. 
  
 2.    Landlord shall, at Landlord’s sole cost and
expense, perform the work necessary to separately demise the New Premises in accordance with the floor plan attached hereto as Exhibit A-1, to separately meter the New Premises for electricity, to install new carpet in and repaint the interior walls
of the New Premises, and to make the Building suitable for multi-tenant occupancy (collectively such work hereinafter the “Reconfiguration Work”). The 

 Reconfiguration Work shall be performed in phases, as follows: 
  
 A. On or before January 13, 2006 (the “New Premises A Relocation
Date”), subject to Section 10.5 of the Lease, Tenant shall vacate the portion of the Building marked “New Premises A” on Exhibit A-1 (hereinafter, the “New Premises A”), and shall, with regard to the New Premises A
(i) roll up all loose data cabling located in that portion of the New Premises and secure the same above the drop ceiling therein, (ii) relocate its personnel and (iii) remove its personal property, fixtures, and equipment located in
that portion of the New Premises (the items in (i), (ii) and (iii) hereinafter collectively the “Relocation Requirements”). If Tenant fails to properly vacate the New Premises A and perform the Relocation Requirements on or
before the New Premises A Relocation Date, then Tenant shall be obligated to pay Annual Fixed Rent at two hundred percent (200%) of the then-applicable Annual Fixed Rent Rate on a per diem basis during the period commencing on the New Premises
A Relocation Date and ending on the date Tenant has properly vacated the New Premises A and performed the Relocation Requirements. 
  
 B. Landlord shall, subject to section 10.5 of the Lease and Tenant Delay (as defined below), endeavor to Substantially Complete (as that term is defined
in below) the Reconfiguration Work on the New Premises A on or before the date which is 60 days following the latest to occur of (i) January 13, 2006, (ii) the date Tenant properly vacates the New Premises A and performs the
Relocation Requirements pursuant to paragraph A, above, and (iii) the date Landlord obtains all permits and approvals required to perform the Reconfiguration Work. Landlord shall provide Tenant with at least fourteen (14) days advance
written notice (the “New Premises A Notice”) of the date (the “New Premises A Completion Date”) that Landlord anticipates that the Reconfiguration Work on the New Premises A will be Substantially Complete. In the event that
Landlord has not Substantially Completed the Reconfiguration Work on the New Premises A on or before the date (the “New Premises A Outside Date”) which is seventy (70) days following the latest to occur of (i) January 13,
2006, (ii) the date Tenant properly vacates the New Premises A and performs the Relocation Requirements pursuant to paragraph A, above, and (iii) the date Landlord obtains all permits and approvals required to perform the Reconfiguration
Work, and such failure is not due to either a Tenant Delay or a cause specified in Section 10.5 of the Lease, then Landlord shall, commencing on April 1, 2006, credit Tenant with one day of free Annual Fixed Rent for each day between the
New Premises A Outside Date and the date that Landlord Substantially Completes the Reconfiguration Work on the New Premises A. As used herein, the term “Substantially Complete” shall mean that the portion of the Reconfiguration Work to be
completed during each phase of the Reconfiguration Work as set forth herein has been completed with the exception of minor items which can be fully completed without material interference with Tenant’s use of or access to such portion of the
New Premises, and other items which because of the season or weather or the nature of the item are not practicable to do at the time, provided that none of said items is necessary to make such portion of the New Premises tenantable for the Permitted
Uses. 

  

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Landlord shall complete any minor or punch list item within a reasonable time period following Substantial Completion of each phase of the Reconfiguration
Work. 
  
 C. Tenant shall, subject to Section 10.5 of the
Lease, have ten (10) days following the New Premises A Completion Date to vacate the portion of the Building marked as the New Premises B on Exhibit A-1 (hereinafter, the “New Premises B”), perform the Relocation Requirements to
relocate from the New Premises B, and to vacate and remove its personal property, fixtures, and equipment from the portion of the Deleted Premises marked as the “Board Room” on Exhibit A-1 attached hereto (hereinafter, the “Board
Room”). The date which is ten (10) days following the New Premises A Completion Date shall hereinafter be referred to as the “New Premises B Relocation Date.” Notwithstanding anything herein to the contrary, Tenant shall not be
required to vacate or perform the Relocation Requirements in the portion of the New Premises B marked as the “Computer Room” on Exhibit A-1 (hereinafter, the “Computer Room”), it being understood that Tenant’s computers
shall be permitted to remain in the Computer Room while the Reconfiguration Work on the New Premises B is being performed. If Tenant fails to properly vacate the New Premises B, perform the Relocation Requirements with regard to the New Premises B,
and properly vacate the Board Room as set forth herein on or before the New Premises B Relocation Date, then Tenant shall be obligated to pay Annual Fixed Rent at two hundred percent (200%) of the Annual Fixed Rent Rate applicable following the
free rent period provided for in this Amendment (i.e. the rate listed for the period from April 1, 2006—March 31, 2007 in Section III of Paragraph 6 of this Amendment) on a per diem basis during the period commencing on the New Premises B
Relocation Date and ending on the date Tenant has properly vacated the New Premises B as aforesaid. 
  
 D. Landlord shall, subject to Section 10.5 of the Lease and Tenant Delay, endeavor to Substantially Complete the Reconfiguration Work on the New
Premises B within sixty (60) days following Tenant’s vacation of that space and performance of the Relocation Requirements pursuant to paragraph C, above. In the event that Landlord has not Substantially Completed the Reconfiguration Work
on the New Premises B or before the date (the “New Premises B Outside Date”) that is seventy (70) days following Tenant’s vacation of that space and performance of the Relocation Requirements pursuant to paragraph C, above, and
such failure is not due to either a Tenant Delay or a cause specified in Section 10.5 of the Lease, then Landlord shall, commencing on April 1, 2006, credit Tenant with one day of free Annual Fixed Rent for each day between the New
Premises B Outside Date and the date that Landlord Substantially Completes the Reconfiguration Work on the New Premises B. Landlord shall provide Tenant with at least fourteen (14) days advance written notice (the “New Premises B
Notice”) of the date (the “New Premises B Completion Date”) that Landlord anticipates that the Reconfiguration Work on the New Premises B will be Substantially Complete. 
  

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 E. During the Reconfiguration Work, Tenant shall have the right to use and occupy the Deleted Premises
(except for the Board Room) subject to all the terms and conditions of the Lease, provided that following the Surrender Date (as defined below), provided that Tenant has adhered to the terms contained herein by such date, there shall be no Annual
Fixed Rent or additional rent payable in connection with such use and occupancy during the Reconfiguration Work. Notwithstanding the foregoing, on or before the New Premises B Relocation Date, subject to Section 10.5 of the Lease, Tenant shall
relocate its personnel and move its personal property, fixtures and equipment so that no items are located within ten feet (10’) of the demising wall which will separate the Deleted Premises from the common areas of the Building and the
New Premises B. In the event that Tenant fails to do so, then Tenant shall be obligated to pay Annual Fixed Rent at two hundred percent (200%) of the Annual Fixed Rent Rate applicable following the free rent period provided for in this
Amendment (i.e. the rate listed for the period from April 1, 2006—March 31, 2007 in Section III of Paragraph 6 of this Amendment) on a per diem basis during the period commencing on the New Premises B Relocation Date and ending on the date
Tenant has properly relocated within the Deleted Premises. Tenant shall have ten (10) days following the New Premises B Completion Date, subject to Section 10.5 of the Lease, to return to the New Premises B, to relocate its personnel and
move its personal property, fixtures, and equipment into such space, and to yield up the Deleted Premises in accordance with Section 6.1.9 of the Lease and this Amendment (provided, however, that the penalty for Tenant’s failure to yield
up the Deleted Premises shall be as set forth in this Amendment, in lieu of the provisions set forth in the second paragraph of Section 6.1.9). The date which is ten (10) days following the New Premises B Completion Date shall hereinafter
be referred to as the “Final Relocation Date.” If Tenant fails to properly yield up the Deleted Premises as set forth herein by the Final Relocation Date, subject to Section 10.5 of the Lease, then Tenant shall be obligated to pay
Annual Fixed Rent at two hundred percent (200%) of the Annual Fixed Rent Rate applicable following the free rent period provided for in this Amendment (i.e. the rate listed for the period from April 1, 2006—March 31, 2007 in Section
III of Paragraph 6 of this Amendment) on a per diem basis during the period commencing on the Final Relocation Date and ending on the date Tenant has properly yielded-up the Deleted Premises as aforesaid. As part of Tenant’s yield up
obligations with regard to the Deleted Premises, Tenant shall, at Tenant’s sole expense, remove all telephone and data wiring from the Deleted Premises, such work to be performed when directed by Landlord, and otherwise in accordance with the
provisions of Section 6.1.9 of the Lease. 
  
 In addition to the
Reconfiguration Work on the New Premises A and B detailed in the schedule above, the parties hereby acknowledge that Landlord will be performing Reconfiguration Work on the portions of the Building which are to become the common areas, which
Landlord shall endeavor to Substantially Complete within thirty (30) days after the New Premises B Completion Date. Tenant shall not interfere with the performance of any part or phase of the 

  

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Reconfiguration Work, and agrees to cooperate with Landlord’s reasonable requirements to facilitate the performance of the Reconfiguration Work, such as
relocating its personnel and moving its personal property, fixtures, and equipment as set forth in this Amendment and as otherwise reasonably requested by Landlord during the performance of the Reconfiguration Work. The Reconfiguration Work shall be
done in a good and workmanlike manner employing good materials and so as to conform to all applicable laws, including all applicable state building laws in effect as of the date hereof relating to the removal of architectural barriers to disabled
persons. Landlord shall use commercially reasonable efforts to obtain all permits and approvals on or prior to the New Premises A Relocation Date. 
  
 3.    Tenant acknowledges that as of January 31, 2006 the term of the Lease will expire with regard to the Deleted Premises, and
that Tenant shall have no further rights to such space from and after February 1, 2006 (the “Surrender Date”) except as permitted pursuant to section E of paragraph 2 hereof, and Tenant shall yield up the Deleted Premises pursuant to
the terms of section E of paragraph 2 hereof. 
  
 4.    Tenant shall be responsible for any additional cost that Landlord incurs in connection with the any aspect of the Reconfiguration Work by virtue of a Tenant Delay. For the purposes hereof, “Tenant Delay”
shall be defined as (i) any failure of Tenant to vacate any portion of the Building and comply with the Relocation Requirements at the times set forth herein and/or (ii) any delay in the completion of the Reconfiguration Work actually
caused by Tenant’s failure to comply with the terms of this Amendment or any material interference with the performance of the Reconfiguration Work by Tenant or any of its agents, employees, engineers or contractors. 
  
 5.    Notwithstanding anything to the contrary contained
herein, as of the Surrender Date, Tenant shall be responsible for cleaning only the New Premises and the common areas of the Building comprising the front entrance, the main corridor and the bathrooms outside of the Deleted Premises (the
“Specified Common Areas”), such obligation to continue until notification from Landlord that the Deleted Premises have been leased and when the Deleted Premises will be occupied (the date upon which the Deleted Premises are to be occupied
hereinafter the “New Tenant Date”). From and after the New Tenant Date, Landlord shall be responsible for cleaning the New Premises, the Specified Common Areas, and any other common areas of the Building (the cost of which will be passed
through pursuant to Section 4.2.3 of the Lease). Further, notwithstanding anything to the contrary contained in the Lease, Tenant shall continue to utilize the dumpster being provided by Landlord, and shall pay for the use of that dumpster
pursuant to Section 4.2.3. 
  
 6.    To
reflect certain adjustments in the Lease on account of the surrender of the Deleted Premises and the extension of the term of the Lease, the following definitions in Section 1.1 of Lease shall be amended (or added, as indicated) as follows,
effective as of the Surrender Date (unless another effective date is indicated): 
  
 (I) The Rentable Floor Area of Premises specified in Section 1.1 shall be reduced to 16,928 square feet; 
  

 5 

 (II) With regard to the New Premises only, effective as of the date of this Amendment, the Expiration
Date specified in Section 1.1 shall be changed to March 31, 2011; 
  
 (III) The Annual Fixed Rent Rate specified in Section 1.1 shall be changed to: 
  

			
	 Surrender Date - March 31, 2006:
	 	$0.00
	 April 1, 2006 - March 31, 2007:
	 	$236,988.00
	 April 1, 2007 - March 31, 2008:
	 	$241,224.00
	 April 1, 2008 - March 31, 2009:
	 	$245,448.00
	 April 1, 2009 - March 31, 2010:
	 	$249,684.00
	 April 1, 2010 - March 31, 2011:
	 	$253,920.00

  
 (IV) The Monthly Fixed
Rent Rate specified in Section 1.1 shall be changed to: 
  

			
	 Surrender Date - March 31, 2006:
	 	$0.00
	 April 1, 2006 - March 31, 2007:
	 	$19,749.00
	 April 1, 2007 - March 31, 2008:
	 	$20,102.00
	 April 1, 2008 - March 31, 2009:
	 	$20,454.00
	 April 1, 2009 - March 31, 2010:
	 	$20,807.00
	 April 1, 2010 - March 31, 2011:
	 	$21,160.00

  
 (V) Exhibit A-1
attached hereto shall be substituted for Exhibit A attached to the Lease; and 
  
 (VI) All references in the Lease to “Premises” shall be deemed to mean the “New Premises” described herein. 
  

(VII) The following terms shall be added to Section 1.1: 
  

	 	(a)	“Tenant’s Percentage: 62.12%” 

	 	(b)	“Estimate of Tenant’s Percentage of Taxes: $35,940.00” 

	 	(c)	“Estimate of Tenant’s Percentage of Operating Expenses: $70,656.00” 

  
 7.    Effective as of the Surrender Date, Section 2.1 of the Lease shall be deleted and replaced in
its entirety by the following: 
  
 “2.1 Premises.
Landlord hereby leases to Tenant and Tenant hereby leases from Landlord, subject to and with the benefit of the terms, covenants, conditions and provisions of this Lease, the Premises, excluding the roof, exterior faces of exterior walls, the common
stairways, stairwells, elevators and elevator shafts, and pipes, ducts, conduits, wires, and appurtenant fixtures serving exclusively or in common other parts of the Building (and any areas, such as the space above the ceiling or in the walls, that
may contain such pipes, ducts, conduits, wires or appurtenant fixtures), and if Tenant’s space includes less than entire rentable area 
  

 6 

 
of any floor, excluding the central core area of such floor. Tenant shall have, as appurtenant to the Premises, rights to use in common, subject to
reasonable rules of general applicability to tenants of the Building from time to time made by Landlord of which Tenant is given notice: (a) the common lobbies, hallways, stairways, and elevators of the Building, (b) common walkways and
driveways necessary for access to the Building, (c) the common parking areas serving the Building, and (d) if the Premises include less than the entire rentable area of any floor, the common toilets and other common facilities in the
central core area of such floor. 
  
 Tenant shall be permitted to
use up to 54 parking spaces in the parking area serving the Building. 
  
 Landlord reserves the right from time to time, without unreasonable interference with Tenant’s use of the Premises: (a) to install, use, maintain, repair, replace and relocate for service to the Premises and other parts of the
Building, or either, pipes, ducts, conduits, wires and appurtenant fixtures, wherever located in the Premises or Building, (b) to alter or relocate any other common facility, (c) to make any repairs and replacements to the Premises which
Landlord may deem necessary, and (d) in connection with any excavation made upon adjacent land of Landlord or others, to enter, and to license others to enter, upon the Premises to do such work as the person causing such excavation deems
necessary to preserve the wall of the Building from injury or damage and to support the same. 
  
 Tenant shall have access to the Premises twenty-four (24) hours per day, seven (7) days per week.” 
  
 8.    Effective as of the date hereof, the following is section shall be added to the Lease as Section 2.4: 
  
 “2.4 Termination Right. Tenant shall have the right to terminate
this Lease effective as of March 31, 2010 (the “Early Termination Date”), provided (i) Tenant delivers written notice of its election to so terminate this Lease on or before March 31, 2009, and (ii) such termination
notice shall be accompanied by a certified or cashier’s check in the amount of two hundred thousand and 00/100 dollars ($200,000.00), as and for an early termination fee. Tenant’s exercise of the foregoing option to terminate is further
subject to the condition that Tenant is not in default under any of the terms, covenants or conditions of this Lease beyond any applicable grace or cure period at the time that Tenant notifies Landlord in writing of the exercise of this termination
option or upon the Early Termination Date. The right granted hereunder is personal to Gensym Corporation and any Related Entity (as defined in Section 6.2.1), and shall not be assigned, transferred or otherwise inure to the benefit of any other
party.” 
  
 9.    Effective as of the
Surrender Date, Sections 4.2.1 and 4.2.3 of the Lease shall be deleted and replaced in their entirety with the following: 
  

 7 

 “4.2.1 Real Estate Taxes. Tenant shall pay to Landlord, as additional rent, for each tax
period partially or wholly included in the term, Tenant’s Percentage of Taxes (as hereinafter defined). Tenant shall remit to Landlord, on the first day of each calendar month, estimated payments on account of Taxes, such monthly amounts to be
sufficient to provide Landlord, by the time real estate tax payments are due and payable to any governmental authority responsible for collection of same, a sum equal to the Tenant’s Percentage of Taxes, as reasonably estimated by Landlord from
time to time on the basis of the most recent tax data available. The initial calculation of the monthly estimated payments shall be based upon the Initial Estimate of Tenant’s Percentage of Taxes for the Tax Year and upon quarterly payments
being due to the governmental authority on August 1, November 1, February 1 and May 1, and shall be made when the Commencement Date has been determined. If the total of such monthly remittances for any Tax Year is
greater than the Tenant’s Percentage of Taxes for such Tax year, Landlord shall promptly pay to Tenant, or credit against the next accruing payments to be made by Tenant pursuant to this subsection 4.2.1, the difference; if the total of such
remittances is less than the Tenant’s Percentage of Taxes for such Tax Year, Tenant shall pay the difference to Landlord at least ten (10) days prior to the date or dates within such Tax Year that any Taxes become due and payable to the
governmental authority (but in any event no earlier than ten (10) days following a written notice to Tenant, which notice shall set forth the manner of computation of Tenant’s Percentage of Taxes). 
  
 If, after Tenant shall have made reimbursement to Landlord pursuant to this
subsection 4.2.1, Landlord shall receive a refund of any portion of Taxes paid by Tenant with respect to any Tax Year during the term hereof as a result of an abatement of such Taxes by legal proceedings, settlement or otherwise (without either
party having any obligation to undertake any such proceedings), Landlord shall promptly pay to Tenant, or credit against the next accruing payments to be made by Tenant pursuant to this subsection 4.2.1, the Tenant’s Percentage of the refund
(less Tenant’s Percentage of expenses, including attorneys’ fees and appraisers’ fees, incurred in connection with obtaining any such refund), as relates to Taxes paid by Tenant to Landlord with respect to any Tax Year for which such
refund is obtained. 
  
 In the event this Lease shall commence, or
shall end (by reason of expiration of the term or earlier termination pursuant to the provisions hereof), on any date other than the first or last day of the Tax Year, or should the Tax Year or period of assessment of real estate taxes be changed or
be more or less than one (1) year, as the case may be, then the amount of Taxes which may be payable by Tenant as provided in this subsection 4.2.1 shall be appropriately apportioned and adjusted. 
  
 The term “Taxes” shall mean all taxes, assessments, betterments and
other charges and impositions (including, but not limited to, fire protection service fees and similar charges) levied, assessed or imposed at any time during the term by any governmental authority upon or against the Property, or taxes in lieu
thereof, 

  

 8 

 
and additional types of taxes to supplement real estate taxes due to legal limits imposed thereon. With respect to betterment or special assessments, in no
event shall Tenant’s obligations to pay such assessments exceed an amount equal to the installment which would be payable had Landlord paid such assessment over the longest period permitted by law. If, at any time during the term of this Lease,
any tax or excise on rents or other taxes, however described, are levied or assessed against Landlord with respect to the rent reserved hereunder, either wholly or partially in substitution for, or in addition to, real estate taxes assessed or
levied on the Property, such tax or excise on rents shall be included in Taxes; however, Taxes shall not include franchise, estate, inheritance, succession, capital levy, transfer, income or excess profits taxes assessed on Landlord. Taxes shall
include any estimated payment made by Landlord on account of a fiscal tax period for which the actual and final amount of taxes for such period has not been determined by the governmental authority as of the date of any such estimated payment.”

  
 “4.2.3 Operating Costs. Tenant shall pay to
Landlord the Tenant’s Percentage of Operating Costs (as hereinafter defined) incurred by Landlord in any calendar year. Tenant shall remit to Landlord, on the first day of each calendar month, estimated payments on account of Operating Costs,
such monthly amounts to be sufficient to provide Landlord, by the end of the calendar year, a sum equal to the Operating Costs, as reasonably estimated by Landlord from time to time. The initial monthly estimated payments shall be in an amount equal
to 1/12th of the Initial Estimate of Tenant’s Percentage of Operating Costs for the calendar year. If, at the expiration of the year in respect of which monthly installments of Operating Costs shall have been made as aforesaid, the total of
such monthly remittances is greater than Tenant’s Percentage of the actual Operating Costs for such year, Landlord shall promptly pay to Tenant, or credit against the next accruing payments to be made by Tenant pursuant to this subsection
4.2.3, the difference; if the total of such remittances is less than Tenant’s Percentage of the Operating Costs for such year, Tenant shall pay the difference to Landlord within twenty (20) days from the date Landlord shall furnish to
Tenant an itemized statement of the Operating Costs, prepared, allocated and computed in accordance with generally accepted accounting principles. Any reimbursement for Operating Costs due and payable by Tenant with respect to periods of less than
twelve (12) months shall be equitably prorated. 
  
 The term
“Operating Costs” shall mean all costs and expenses incurred for the operation, cleaning, maintenance, repair and upkeep of the Property, and the portion of such costs and expenses with regard to the common areas, facilities and amenities
of the Park which is equitably allocable to the Property, including, without limitation, all costs of maintaining and repairing the Property and the Park (including snow removal, landscaping and grounds maintenance, operation and maintenance of
parking lots, sidewalks, walking paths, access roads and driveways, security, operation and repair of heating and air-conditioning equipment, lighting and any other Building equipment or systems) and of all 

  

 9 

 
repairs and replacements (other than repairs or replacements for which Landlord has received full reimbursement from contractors, other tenants of the
Building or from others) necessary to keep the Property and the Park in good working order, repair, appearance and condition; all costs, including material and equipment costs, for cleaning and janitorial services to the Building (including window
cleaning of the Building); all costs of any reasonable insurance carried by Landlord relating to the Property; all costs related to provision of heat (including oil, electric, steam and/or gas), air-conditioning, and water (including sewer charges)
and other utilities to the Premises and the Building (exclusive of reimbursement to Landlord for any of same received as a result of direct billing to any tenant of the Building); payments under all service contracts relating to the foregoing; all
compensation, fringe benefits, payroll taxes and workmen’s compensation insurance premiums related thereto with respect to any employees of Landlord or its affiliates engaged in security and maintenance of the Property and the Park;
attorneys’ fees and disbursements (exclusive of any such fees and disbursements incurred in tax abatement proceedings or the preparation of leases) and auditing and other professional fees and expenses; and a management fee consistent with the
prevailing management fees charged by other landlords of comparable buildings in the area. 
  
 There shall not be included in such Operating Costs brokerage fees (including rental fees) related to the operation of the Building; interest and depreciation charges incurred on the Property; expenditures made by
Tenant with respect to (i) cleaning, maintenance and upkeep of the Premises, and (ii) the provision of electricity to the Premises; construction in or changes to the Park, or improvements to any of the buildings located therein, except as
same directly benefit Tenant; installations, alterations, or replacements which constitute capital expenditures under generally accepted accounting principles, except as provided for in the next paragraph below; costs incurred in completing the Base
Building Improvements or correcting defects in Landlord’s Work; environmental testing, compliance, or remediation except if required on account of a breach by Tenant of its obligations under Section 6.2.3 hereof; compensation for
administrative staff, executives, or officers of Landlord above the grade of building manager; franchise or income taxes imposed upon Landlord; advertising expenses; the costs of any items for which Landlord is reimbursed (or but for Landlord’s
act or omission would have been reimbursed); the costs of any repairs made by Landlord pursuant to the damage or condemnation provisions of this Lease; interest and principal payments on any mortgage, deed of trust, or any ground lease rent; legal
fees arising out of the construction, use, occupation or maintenance of the Park, or the enforcement of any agreements affecting the Park, except as the same directly benefit Tenant; insurance premium increases not caused by Tenant; Landlord’s
charitable or political contributions; reserves; and Landlord’s travel or entertainment expenses. 
  
 If, during the term of this Lease, Landlord shall replace any capital items or make any capital expenditures (i) to comply with laws in effect after
the 

  

 10 

 
Commencement Date, or (ii) which are reasonably expected to effect savings in Operating Costs or (iii) to repair or replace worn-out items
(collectively called “capital expenditures”) the total amount of which is not properly included in Operating Costs for the calendar year in which they were made, there shall nevertheless be included in Operating Costs for each calendar
year in which and after such capital expenditure is made the annual charge-off of such capital expenditure. Annual charge-off shall be determined by (i) dividing the original cost of the capital expenditure by the number of years of useful life
thereof (the useful life shall be reasonably determined by Landlord in accordance with generally accepted accounting principles and practices in effect at the time of acquisition of the capital item); and (ii) adding to such quotient an
interest factor computed on the unamortized balance of such capital expenditure based upon an interest rate reasonably determined by Landlord as being the interest rate then being charged for long-term mortgages by institutional lenders on like
properties within the locality in which the Building is located. Provided, further, that if Landlord reasonably concludes on the basis of engineering estimates that a particular capital expenditure will effect savings in Operating Costs and that
such annual projected savings will exceed the annual charge-off of capital expenditure computed as aforesaid, then and in such events, the annual charge-off shall be determined by dividing the amount of such capital expenditure by the number of
years over which the projected amount of such savings shall fully amortize the cost of such capital item or the amount of such capital expenditure; and by adding the interest factor, as aforesaid. 
  
 If during any portion of any year for which Operating Costs are being
computed, the Building was not fully occupied by tenants or if not all of such tenants were paying fixed rent or if Landlord was not supplying all tenants with the services, amenities or benefits being supplied hereunder, then, with regard to
Operating Costs that vary due to occupancy, actual Operating Costs incurred shall be reasonably extrapolated by Landlord to the estimated Operating Costs that would have been incurred if the Building were fully occupied by tenants and all such
tenants were then paying fixed rent or if such services were being supplied to all tenants, and such extrapolated amount shall, for the purposes of this Section 4.2.3, be deemed to be the Operating Costs for such year. In no event shall
Landlord be entitled to receive from Tenant and any other tenants of the Building an aggregate amount in excess of actual Operating Costs as a result of the foregoing provision.” 
  
 10.    Effective as of the date hereof, the Letter of Credit Amount specified in Section 1.1 of the
Lease, shall be reduced to $50,000.00, and Section 4.4.1.1 is hereby deleted. Tenant shall be responsible for amending the existing Letter of Credit or delivering a replacement to Landlord to effect the aforesaid reduction. Any replacement
letter of credit issued in the reduced amount shall satisfy the requirements for the Original Letter of Credit under Section 4.4.1 of the Lease and shall be deemed a “Substitute Letter of Credit” for all purposes under
Section 4.4 of the Lease. 
  
 11.    Effective as of the Surrender Date, Section 4.2.5 of the Lease shall be deleted and 

  

 11 

 
replaced in its entirety by the following: 
  
 “4.2.5 Utilities. Tenant shall pay directly to the public authority or utility all charges for the cost of electricity furnished or consumed
on the Premises (which shall include lights, outlets and VAV boxes), and shall also be responsible for all charges for any utilities supplied by Landlord pursuant to Subsections 5.1.1 and 5.1.3 which are not separately metered (e.g. gas for the
Building and electricity for the common areas, which are payable as part of Operating Costs pursuant to Section 4.2.3), and all charges for telephone and other utilities or services not supplied by Landlord pursuant to Subsections 5.1.1 and
5.1.3, whether designated as a charge, tax, assessment, fee or otherwise, all such charges to be paid as the same from time to time become due. Except as otherwise provided in Article 5, it is understood and agreed that Tenant shall make its own
arrangements for the installation or provision of all such utilities and that Landlord shall be under no obligation to furnish any utilities to the Premises and shall not be liable for any interruption or failure in the supply of any such utilities
to the Premises.” 
  
 12.    Effective as
of the Surrender Date, Section 5.1.1 of the Lease shall be deleted and replaced in its entirety by the following: 
  
 “5.1.1 Heat and Air-Conditioning. To furnish to the Premises, at the expense of Tenant as hereinabove provided, heat and air-conditioning
(reserving the right, at any time, to change energy or heat sources) sufficient to maintain the Premises at comfortable temperatures (subject to all federal, state, and local regulations relating to the provision of heat), during such hours of the
day and days of the year that the Building is normally open. Notwithstanding any provision hereof the contrary, Tenant shall have control of its heating and air conditioning during normal business hours (i.e. 7:00 a.m.—7:00 p.m.) during normal
business days.” 
  
 13.    Effective as
of the Surrender Date, Section 5.1.5 of the Lease shall be deleted and replaced in its entirety by the following: 
  
 “5.1.5 Repairs. Except as otherwise expressly provided herein, to make such repairs and replacements to the roof, exterior walls, floor slabs
and other structural components of the Building, and to the common areas, facilities and plumbing, electrical, heating, ventilating and air-conditioning systems of the Building as may be necessary to keep them in good repair and condition (exclusive
of equipment installed by Tenant and except for those repairs required to be made by Tenant pursuant to Section 6.1.3 hereof and repairs or replacements occasioned by any act or negligence of Tenant, its servants, agents, customers,
contractors, employees, invitees, or licensees).” 
  
 14.    Effective as of the New Tenant Date, the following shall be added to the Lease as Section 5.1.8: 
  

 12 

 “5.1.8 Cleaning. To provide cleaning to the Premises and the common areas of the Building in
accordance with cleaning and janitorial standards generally prevailing throughout the term hereof in comparable office buildings within the municipality in which the Building is located.” 
  
 15.    Effective as of the Surrender Date, the following
section shall be added to the Lease as Section 5.3: 
  
 “5.3 Outside Services. In the event Tenant wishes to provide outside services for the Premises over and above those services to be provided by Landlord as set forth herein, Tenant shall first obtain the prior written approval of
Landlord (such approval not to be unreasonably withheld, conditioned or delayed) for the installation and/or utilization of such services (“Outside services” shall include, but shall not be limited to, cleaning services, television,
so-called “canned music” services, security services, catering services and the like.) In the event Landlord approves the installation and/or utilization of such services, such installation and utilization shall be at Tenant’s sole
cost, risk and expense.” 
  
 16.    Effective as of the Surrender Date, Section 6.1.10 of the Lease shall be deleted and replaced in its entirety by the following: 
  
 “6.1.10 Rules and Regulations. To comply with the Rules and Regulations set forth in Exhibit E, and with all
reasonable Rules and Regulations of general applicability to all tenants of the Building hereafter made by Landlord, of which Tenant has been given written notice; Landlord shall not be liable to Tenant for the failure of other tenants of the
Building to conform to such Rules and Regulations, and no alteration or waiver of any rule or regulation in favor of one tenant shall operate as an alteration or waiver in favor of any other tenant. Notwithstanding the foregoing, Landlord shall not
enforce any such Rules and Regulations in a discriminatory manner.” 
  
 17.    Notwithstanding any provision of this Lease or Amendment to the contrary, Landlord shall permit Tenant’s existing sign to remain on the exterior of the Building until the expiration or
earlier termination of the Lease. 
  
 18.    It is the intention of the parties hereto that the obligations of Tenant hereunder shall be separate and independent covenants and agreements, that the Annual Fixed Rent, the Additional Rent and all other sums
payable by Tenant to Landlord shall continue to be payable in all events and that the obligations of Tenant hereunder shall continue unaffected, unless the requirement to pay or perform the same shall have been terminated pursuant to an express
provision of this Lease. 
  
 19.    Tenant
warrants and represents that it has dealt with no broker in connection with the consummation of this Amendment, other than Nordblom Company and Trammell Crow Company (collectively, the “Brokers”), and in the event of any brokerage claims,
other than by the Brokers, against Landlord predicated upon prior dealings with Tenant, Tenant agrees to defend the same and indemnify and hold Landlord harmless against any such claim. 
  

 13 

 20.    The recitals set forth above at the beginning of this document are hereby
incorporated into this Amendment. Undefined capitalized terms used herein without definition shall have the meanings ascribed to them in the Lease. 
  
 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK] 
 [SIGNATURES APPEAR ON THE FOLLOWING PAGE] 
  

 14 

 Except as modified herein, the Lease is confirmed and ratified in all respects and shall continue in full
force and effect. 
  
 Executed under seal as of the date first
written above. 
  

	
	 LANDLORD:

	
	 /s/ Rodger P. Nordblom

	As Trustee, but not individually

  
  

	
	
	 /s/ Peter C. Nordblom

	As Trustee, but not individually

  
  
  
  

			
	 TENANT:
  
 GENSYM CORPORATION

		
	By:	 	 /s/ Stephen D. Allison

	 Name:
 Title:
	 	 Stephen D. Allison
 Vice President, Finance and Chief
Financial Officer

  

 15

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