Exterior Signage. Tenant, at its sole cost and expense, may install # its prorata share of identification signage on the existing monument sign located at the Project, and # at the entrance to the Building, and on the exterior of the Building (collectively, "Tenant Signage"); provided, however, in no event shall Tenant's Signage include an "Objectionable Name," as that term is defined in Section 23.2 of this Lease. All such signage shall be subject to Tenant's obtaining all required governmental approvals. All permitted signs shall be maintained by Tenant at its expense in a good and safe condition and appearance. Upon the expiration or earlier termination of this Lease, Tenant shall remove all of its signs at Tenant's sole cost and expense. The graphics, materials, color, design, lettering, lighting, size, illumination, specifications and exact location of Tenant's Signage (collectively, the "Sign Specifications") shall be subject to the prior written approval of Landlord, which approval shall not be unreasonably withheld, conditioned or delayed, and shall be consistent and compatible with the quality and nature of the Project. Tenant hereby acknowledges that, notwithstanding Landlord's approval of Tenant's Signage, Landlord has made no representation or warranty to

Exterior Signage. Subject to Landlord's prior written approval, which shall not be unreasonably withheld, conditioned or delayed, and provided all signs are in keeping with the quality, design and style of the Building and Project, Tenant, at its sole cost and expense, may install # identification signage on the monument sign outside the front entrance to the Building (which Landlord shall install at its sole cost prior to the Lease Commencement Date), # internal directional and lobby identification signage, and # signage in two (2) locations on the exterior of the Building in accordance with the Project master signage program (collectively, "Tenant Signage"); provided, however, # in no event shall Tenant's Signage include an "Objectionable Name," as that term is defined in Section 23.3, of this Lease, and # Landlord shall consult with Tenant prior to finalizing the master signage program and consider in good faith Tenant's reasonable comments with respect thereto. All such signage shall be subject to Tenant's obtaining all required governmental approvals. All permitted signs shall be maintained by Tenant at its expense in a first-class and safe condition and appearance. Upon the expiration or earlier termination of this Lease, Tenant shall remove all of its signs at Tenant's sole cost and expense. The graphics, materials, color, design, lettering, lighting, size, illumination, specifications and exact location of Tenant's Signage (collectively, the "Sign Specifications") shall be subject to the prior written approval of Landlord, which approval shall not be unreasonably withheld, conditioned or delayed, and shall be consistent and compatible with the quality and nature of the Project. Tenant hereby acknowledges that, notwithstanding Landlord's approval of Tenant's Signage, Landlord has made no representation or warranty to Tenant with respect to the probability of obtaining all necessary governmental approvals and permits for Tenant's Signage. In the event Tenant does not receive the necessary governmental approvals and permits for Tenant's Signage, Tenant's and Landlord's rights and obligations under the remaining terms of this Lease shall be unaffected. Except as required by applicable law, Landlord shall not install any other signage on the Building. If Landlord elects to install a multi-tenant identification sign at the entrance to the Project, Tenant shall be entitled to install its name on such sign (subject to availability on a pro-rata basis based on the relative square footages leased by the tenants of the Project), at Tenant's sole cost and expense.

Exterior Building Signage. Section 13. Building Signage. of the Second Amendment shall be deleted in its entirety and replaced with the following:

In addition to Tenant’s Monument Signage, provided that and for so long as Tenant satisfies the Signage Conditions, Tenant shall have the right to erect and maintain one (1) sign on the exterior of the Building at the entrance to the Premises (the “Exterior Signage”), provided # the Exterior Signage complies with the signage guidelines attached hereto as Exhibit 10 (the “Signage Guidelines”) and all Legal Requirements (and Tenant shall have obtained any necessary permits, which Landlord agrees to cooperate reasonably with Tenant, but at no cost to Landlord, in obtaining, prior to erecting the Exterior Signage), # the location of the Exterior Signage shall be at the main entrance to the Premises, # the materials, design, lighting and method of installation of the Exterior Signage, and any requested changes thereto, shall be subject to Landlord’s prior written approval, which approval shall not be unreasonably withheld, conditioned or delayed, and # Tenant shall at all times maintain the Exterior Signage in good order, condition and repair and shall remove the Exterior Signage at the expiration or earlier termination of the Term hereof or upon Landlord's written demand after the failure of Tenant to satisfy the Signage Conditions, and shall repair any damage to the Building caused by the Exterior Signage or the installation or removal thereof. Tenant shall have the right, from time to time throughout the Term of this Lease, to replace its signage (if any) with signage which is equivalent to the signage being replaced, subject to all of the terms and conditions of this Section 12.2.

Subject to the rights of Landlord as hereinafter set forth and provided, Landlord shall, prior to the Commencement Date, install, at Tenant’s sole cost and expense, a sign identifying Tenant as a tenant of the Building on the exterior of the Building’s 45th Street entrance, subject to Landlord’s reasonable approval and any approval(s) required by New York City, at the location described in, and in accordance with # specifications prepared by Landlord, at Tenant’s expense, and # the Building’s signage program (any such sign erected by Landlord on the exterior of the Building’s 45th Street entrance being collectively referred to herein as “Tenant’s Exterior Signage”) (it being understood that a rendering of Tenant’s Exterior Signage under the Building’s current signage program, which rendering has been approved by Landlord, is attached hereto as [Exhibit D]; provided, subject to Landlord’s reasonable approval Tenant may request additional modifications to the rendering so long as the modified signage is substantially similar to the rendering. Notwithstanding any of the foregoing, Tenant’s rights set forth in this [Section 10.03] are non-exclusive, and Landlord may, without triggering any rights of Tenant under this [Section 10.03], install signage on the exterior of the Buildings 45th Street entrance that identifies any of the following: # Landlord or any affiliates of Landlord, # a tenant or occupant of the Building that was granted such right in connection with a lease, # a person (other than a tenant of the Building) to which Landlord sold such naming rights, or # the managing agent for the Building or the Unit. If at any time the Named Tenant is no longer leasing at least three (3) full floors pursuant to this Lease, Landlord shall be permitted to remove Tenant’s Exterior Signage and Tenant shall thereafter have no further rights with respect to the Tenant’s Exterior Signage.

Landlord hereby agrees not to offer exterior, non-exclusive, top of building signage to any other tenant of the Building who has leased two (2) full floors or less without first offering such signage rights to Tenant. Landlord and Tenant hereby agree and acknowledge that if such exterior signage rights are offered by Landlord and accepted by Tenant, Tenant shall pay Landlord the prevailing market rate for such rights, and Landlord and Tenant also agree that the cost to design, secure approvals and permits for, fabricate, install, maintain, repair, remove and restore any such exterior signage shall be at Tenant’s sole cost and expense.

Notwithstanding the terms and conditions of [Section 18.4] of the Lease, and subject to: # all applicable laws; and # Landlord’s prior written approval, which approval shall not be unreasonably withheld, conditioned or delayed, Tenant, at its sole cost and expense, shall have the right to install exclusive signage on any area above the first (1st) floor of the exterior office portion of the Building (the “Exterior Building Signage”) which shall exclude any signage below the first (1st) floor for the ground floor retail tenants of the Building. The size and location of the Exterior Building signage shall be mutually agreed upon by Landlord and Tenant and shall be subject to the approval of the City of Cambridge. Upon expiration or earlier termination of the Lease, Tenant shall remove the Exterior Building Signage at its sole cost and expense and leave the Building façade in good, clean condition and repair.

maintain, repair and replace Tenant’s interior and exterior signage and the monument sign;

Tenant’s right to Tenant’s Exterior Signage shall be personal to the Named Tenant.

the option to install prominent signage on the exterior of the Building and pedestal signage adjacent to the entrance to the Building, including the Building name set out herein,