THIS ASSIGNMENT AGREEMENT (this “ Assignment ”) is entered into as of the 22
day of June,
2006 (the “ Effective Date ”) by and between ARRAY BIOPHARMA INC., a Delaware corporation (“
Assignor ”) and BIOMED REALTY, L.P., a Maryland limited partnership (“ Assignee ”).
A. WHEREAS, 3200 Walnut LL, LLC, a Delaware limited liability company (the “ Boulder
Seller ”), and Assignor will enter into that certain Option Agreement (the “ Boulder Option Agreement ”), a
copy of which is attached hereto as Exhibit A , pursuant to which the Boulder Seller granted Assignor the option
to purchase that certain real property located at 1885 33rd Street, 1825 33rd Street, 1865 33rd Street, and
3200 Walnut Street, Boulder, Colorado (the “ Boulder Option ”), as more particularly described in Exhibit A to
the Boulder Option Agreement (the “ Boulder Property ”).
B. WHEREAS, the Boulder Seller and Amgen Inc., a Delaware corporation (“ Amgen ”), entered
into that certain Lease dated May 13, 1999 (as amended, the “ Existing Boulder Lease ”), pursuant to which
Amgen leased the Boulder Property on the terms and conditions set forth in the Existing Boulder Lease. In
connection therewith, Amgen and Assignor entered into that certain Lease dated July 17, 1998 (as amended, the
“ Existing Boulder Sublease ”), pursuant to which Assignor subleased the Boulder Property on the terms and
conditions contained in the Existing Boulder Sublease.
C. WHEREAS, Assignor and Circle Capital Longmont LLC, a Delaware limited liability company
(“ Longmont Seller ”), have previously entered into that certain Lease Agreement, dated as of February 28,
2000, as amended by: (a) Addendum to Lease Agreement No. 1 dated May 24, 2001, (b) Addendum to Lease
Agreement No. 2 dated February 11, 2002, (c) Addendum to Lease Agreement No. 3 dated November 30,
2004, (d) Addendum No. 4 to Lease Agreement dated as of August 4, 2005, (e) Addendum No. 5 to Lease