CONSENT TO SUBLEASE
THIS CONSENT TO SUBLEASE (this "Consent) is dated as of November 1, 1997, is made with reference to
that certain sublease (the "Sublease") dated November 1, 1997, by and between AutoImmune, Inc., with an
address at 128 Spring Street, Lexington, Massachusetts 02173 (Tenant") and Antigenics, LLC, with an address
at 630 Fifth Avenue, Suite 2170, New York, New York 10111 ("Sublessee"), and is entered into by and among
Ledgemont Realty Trust with an address at 177 Milk Street, Boston, Massachusetts 02109 ("Landlord"), Tenant
and Sublessee, with reference to the following facts:
(A) Landlord and Tenant are the parties to that certain Lease dated as of December 3, 1992, as amended
(B) Tenant and Sublessee wish to enter into the Sublease;
(C) The Master Lease provides, inter alia that Tenant may not enter into any sublease without Landlord's prior
(D) Tenant and Sublessee have herewith presented the fully-executed Sublease (a true copy of which is attached
hereto) to Landlord for Landlord's approval, upon all of the terms and conditions hereinafter appearing.
NOW, THEREFORE, for good and valuable consideration, the parties agree as follows:
Landlord hereby consents to the Sublease upon the terms and conditions set forth in the General Conditions of
Consent to Sublease attached hereto and made an integral part hereof.
Landlord also consents to the installation of signage at the Premises, at Tenant's expense, identifying Subtenant in
accordance with Landlord's Building standard.
Landlord also consents in concept to the Installation of an exhaust system for Subtenant's pilot operations in
Level 600 of Building B at One Ledgemont Center on the following conditions: (i) the actual work shall be
performed in accordance with plans and specifications to be approved by Landlord in advance;
(ii) such work shall be performed in accordance with the provisions governing Tenant Work in Section 3.2 of the
Master Lease and (iii) the