Beacon Capital Partners is an American real estate investment firm based in Boston, Massachusetts. It was founded in 1998, after Beacon Properties, Inc., Beacon's predecessor, was acquired by EQ Office in a $4 billion transaction. The company focuses on office and life science properties in major markets across the United States. Its European presence formerly included buildings in London, Paris, and Luxemburg.

EQ Office is a real estate investment company that owns 80 office properties comprising 40 million square feet. The company is owned by funds managed by The Blackstone Group. The company was formerly known as Equity Office.