Acceleron Pharma, Inc. has doubled its space.  Joe Flaherty and Tucker Hansen of Colliers Meredith & Grew represented Acceleron in two leases totaling 74,816 s/f.  Acceleron is a biopharmaceutical company developing novel therapeutics that modulate the growth of tissues including bone and muscle.
In a new transaction, Acceleron leased the entire 37,700 s/f 128 Sidney St.  Acceleron also agreed to a long-term lease extension on its existing 37,116 s/f building at 149 Sidney St.
The landlord, Massachusetts Institute of Technology, was represented in-house by John McQuaid and Patrick Rowe.  
According to Nancy Sullivan, Acceleron's senior director of operations, "the 128 Sidney St. building enables Acceleron to take advantage of the building's existing high quality laboratory spaces while the building's flexible footprint and configuration allows us to economically and efficiently construct our second GMP manufacturing facility to support the company's rapid growth."