STANDARD FORM COMMERCIAL LEASE
THIS LEASE SHALL BE TREATED AS A SO-CALLED "TRIPLE NET LEASE"
SCHEDULE OF RENT
a) Base rent of $164,000.00 per year, payable in advance in monthly installments of $13,666.66.
b) Commencing as of June 1, 1992 and each June 1 thereafter, the base rent shall be increased by an amount
equal to 5% of the prior year's base rent.
c) The LESSEE shall pay to the LESSOR, within 30 days of invoice by the LESSOR together with a copy of the
respective bills or invoices, the real estate taxes, premiums for insurance coverage and water and sewer charges
incurred by the LESSOR for the premises during the term of this Lease. LESSOR shall send such bills to
LESSEE at 14 Cambridge Center, Cambridge, MA 02142, Attention Accounts Payable. The LESSEE reserves
the right to appeal real estate taxes and receive benefit of abatements if any. The LESSEE reserves the right to
secure and pay for comparable insurance coverage itself.
4A. Premature Termination:
a) After the expiration of eight (8) years the LESSEE may prematurely terminate this Lease providing to the
LESSOR a written notice sent not less than one (1) year in advance of the effective date together with the
payment of a premature termination fee in an amount equal to six (6) months rent at the then current base rent
b) After the expiration of nine (9) years the LESSEE may prematurely terminate this Lease by following the
procedures set forth above except shall only pay an amount equal to three
Steven D. Rosenberg as Trustee of the Fifth Street
1. PARTIES Realty Trust of 300 Bent Street, Cambridge, MA 02141
LESSOR, which expression shall include his heirs,
successors, and assigns where the context so admits,
does hereby lease to Biogen, Inc., a corporation
having its mailing address at 14 Cambridge Center,