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ACQUISITION AND DISPOSITION OF PROPERTIES AND DISCONTINUED OPERATIONS Acquisitions (Details) (USD $)	6 Months Ended	1 Months Ended											6 Months Ended		1 Months Ended
	Jun. 30, 2012 Core Portfolio	Jun. 30, 2012 Shopping Center Washington, D.C. Core Portfolio sqft	Mar. 31, 2012 Four Property Portfolio Chicago Illinois Core Portfolio	Feb. 29, 2012 River Street Cambridge Massachusetts Core Portfolio sqft	Feb. 29, 2012 Putnam Avenue Cambridge Massachusetts Core Portfolio sqft	May 31, 2012 28 Jericho Turnpike Westbury, New York Core Portfolio sqft	Jan. 31, 2012 1520 North Milwaukee Avenue Chicago Illinois Core Portfolio sqft	Apr. 30, 2012 930 Rush Street Chicago Illinois Core Portfolio sqft	Jun. 30, 2012 Acquisitions in 2012 Finalized Purchase Price Allocation	Jun. 30, 2012 Acquisitions in 2012 Preliminary Purchase Price Allocation	Jun. 30, 2012 Acquisitions in 2011 Finalized Purchase Price Allocation	Jun. 30, 2012 Acquisitions in 2011 Preliminary Purchase Price Allocation	Jun. 30, 2012 Fund III	Jun. 30, 2012 Fund III Opportunity Funds	Feb. 29, 2012 Fund III 640 Broadway New York New York Opportunity Funds sqft	Apr. 30, 2012 Fund III Lincoln Park Centre Chicago Illinois Opportunity Funds sqft
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price		$ 21,700,000	$ 18,800,000	$ 12,200,000	$ 6,700,000	$ 27,300,000	$ 3,800,000	$ 20,700,000							$ 16,300,000	$ 31,500,000
Business Acquisition, Debt Assumption		16,500,000	16,000,000	7,000,000												19,800,000
Square Footage of Real Estate Property (in square feet)		57,000		40,000	13,300	96,000	3,100	2,930							45,700	62,700
Business Combination, Acquisition Related Costs	800,000													1,500,000
Ownership Interest By General Partner or Managing Partner													19.90%		50.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net
Land									8,097,000	33,953,000	3,110,000	2,250,000
Buildings and Improvements									13,142,000	106,199,000	7,354,000	9,000,000
Acquisition-related intangible assets (in Acquired lease intangibles, net)									1,517,000	0	786,000	0
Acquisition-related intangible liabilities (in Acquired lease and other intangibles, net)									(4,387,000)	0
Above-below market debt assumed (included in Mortgage notes payable)									502,000	0
Total consideration									$ 18,871,000	$ 140,152,000	$ 11,250,000	$ 11,250,000

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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The net amount recognized as of the acquisition date for the aggregate identifiable assets acquired in excess of or less than the aggregate liabilities assumed.

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The number of units or percentage investment held by the managing member or general partner of the LLC or LP.

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The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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