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Unconsolidated Real Estate Affiliates (Details Textual) (USD $)						12 Months Ended		12 Months Ended
	Dec. 31, 2012 Legacy Village [Member] sqft	Aug. 25, 2004 Legacy Village [Member]	Dec. 31, 2012 111 Sutter Street [Member] sqft	Dec. 04, 2012 111 Sutter Street [Member]	Mar. 29, 2005 111 Sutter Street [Member]	Dec. 31, 2010 9800 Meridian [Member]	Sep. 30, 2010 9800 Meridian [Member]	Dec. 31, 2010 18922 Forge Drive [Member]
Unconsolidated Real Estate Affiliates (Textual) [Abstract]
Ownership interest in unconsolidated real estate affiliates	46.50%		80.00%				90.00%
Area of Real Estate Property (in square feet)	595,000		286,000
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds		$ 35,000,000			$ 24,646,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage				20.00%
Proceeds from Sale of Property, Plant, and Equipment						1,000,000
Equity Method Investment, Realized Gain (Loss) on Disposal						$ 0		$ 428,000

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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