Boston Properties, Inc. is an integrated, self-administered and self-managed real estate investment trust (REIT). The Company is an owner and developer of office properties in the United States. The Company's properties are concentrated in five markets: Boston, New York, Princeton, San Francisco and Washington, DC. As of December 31, 2012, the Company owned or had interests in 157 properties, totaling approximately 44.4 million net rentable square feet, including seven properties under construction totaling approximately 2.8 million net rentable square feet. In March 2012, the Company acquired 100 Federal Street in Boston, Massachusetts from an affiliate of Bank of America, N.A. On March 1, 2012, the Company acquired 453 Ravendale Drive. On October 4, 2012, the Company acquired Fountain Square. In June 2013, Sungate Fifth Avenue LLC and 767 LLC, acquired a 40% interest in the General Motors Building located in New York, from joint venture partners of Boston Properties Inc.