Acceleron Pharma (NYSE: XLRN) has extended its full occupancy lease at 128 Sidney St. in Cambridge, MA for an additional five years.

The clinical stage biopharmaceutical company has fully occupied the 37,700-square-foot, single-story office and manufacturing complex since 2008, according to CoStar information. Prior to 2008, ImmunoGen occupied the building to support its manufacturing efforts.

With the amendment, which will commence October…

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