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SUBSEQUENT EVENTS	6 Months Ended
	Jun. 30, 2012
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS During July 2012, the Company acquired 83 Spring Street, a 4,800 square foot single tenant property located in New York, New York for $11.5 million. During July 2012, the Company closed on an additional $117.5 million of equity commitments for Fund IV with nine additional institutional investors. As of July 31, 2012, the Company has closed on a total of $465.1 million of Fund IV equity commitments with 17 institutional investors. The Operating Partnership's share of closed equity commitments totaled $100.0 million. During July 2012, the Company entered into a contract to sell 125 Main Street, a Fund III property located in Westport, Connecticut for $33.5 million.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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