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ACQUISITION AND DISPOSITION OF PROPERTIES AND DISCONTINUED OPERATIONS Acquisitions (Details) (USD $)		12 Months Ended	0 Months Ended		1 Months Ended				12 Months Ended		1 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended	1 Months Ended		3 Months Ended	1 Months Ended								1 Months Ended
	Dec. 31, 2011 properties	Dec. 31, 2011 Core Portfolio [Member]	May 10, 2011 Chicago Illinois [Member] Core Portfolio [Member] sqft	Aug. 31, 2011 Chicago Illinois [Member] Core Portfolio [Member] properties	Aug. 31, 2011 Bronx New York [Member] Core Portfolio [Member] sqft	Jun. 30, 2011 New York New York [Member] Core Portfolio [Member] sqft	Sep. 30, 2011 Georgetown Portfolio [Member] Core Portfolio [Member]	Sep. 30, 2011 Georgetown Portfolio [Member] Washington, D.C. [Member] Core Portfolio [Member]	Dec. 31, 2011 Fund III [Member] Opportunity Funds [Member]	Jun. 30, 2010 Fund III [Member] Opportunity Funds [Member]	Apr. 30, 2011 Fund III [Member] Chicago Illinois [Member] Opportunity Funds [Member] sqft	Dec. 31, 2011 Fund III [Member] New Hyde Park Shopping Center [Member] New Hyde Park New York [Member] Opportunity Funds [Member] sqft	Dec. 31, 2011 Fund III [Member] 654 Broadway [Member] New York New York [Member] Opportunity Funds [Member] sqft	Jan. 31, 2009 Fund III [Member] Cortlandt Towne Center [Member] Cortlandt New York [Member] Opportunity Funds [Member] sqft	Dec. 31, 2011 Fund III [Member] Parkway Crossing [Member] Baltimore Maryland [Member] Opportunity Funds [Member] sqft	Feb. 28, 2011 Fund III [Member] Lincoln Road [Member] South Miami Beach Florida [Member] Opportunity Funds [Member] sqft	Feb. 28, 2011 Fund III [Member] White Oak [Member] Silver Spring Maryland [Member] Opportunity Funds [Member] sqft	Dec. 31, 2010 Fund III [Member] White City Shopping Center [Member] Shrewsbury Massachusetts [Member] Opportunity Funds [Member] sqft	Jun. 30, 2010 Fund II [Member] CityPoint [Member] Opportunity Funds [Member]	Jun. 29, 2010 Fund II [Member] CityPoint [Member] Brooklyn, New York [Member] Opportunity Funds [Member]	Jun. 29, 2010 Fund II [Member] CityPoint [Member] Brooklyn, New York [Member] Opportunity Funds [Member] Retail [Member]	Jun. 29, 2010 Fund II [Member] CityPoint [Member] Brooklyn, New York [Member] Opportunity Funds [Member] Office [Member]	Jun. 29, 2010 Fund II [Member] CityPoint [Member] Brooklyn, New York [Member] Opportunity Funds [Member] Residential [Member]	Jun. 29, 2010 California Urban Investment Partners, LLC [Member] Fund II [Member] CityPoint [Member] Brooklyn, New York [Member] Opportunity Funds [Member] Residential [Member]	Dec. 31, 2011 Land [Member]	Dec. 31, 2011 Building and Building Improvements [Member]	Jun. 30, 2010 Operating Partnership, as General Partner or Managing Member [Member] Fund II [Member] CityPoint [Member] Opportunity Funds [Member]
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage							50.00%	50.00%		50.00%										24.75%	75.00%	50.00%	0.00%	100.00%
Equity Method Investments								$ 13,400,000
Business Acquisition, Cost of Acquired Entity, Purchase Price			28,400,000	18,000,000	9,100,000	4,800,000					31,600,000	11,300,000	13,300,000	78,000,000	21,600,000	51,900,000	9,800,000	56,000,000	9,200,000
In-Place Debt Assumption Percentage								50.00%
Equity Method Investment, Debt Assumed								9,200,000
Number of Retail Properties	82			6
Square Footage of Real Estate Property (in feet)			44,000		13,000	6,000					105,000	31,500	18,700	641,000	260,000	61,400	64,600	255,000
In-Place Mortgage Debt Assumption																20,600,000			19,600,000
Ownership Percentage																95.00%	90.00%
Business Combination, Acquisition Related Costs		800,000							600,000					200,000
Business Acquisition, Purchase Price Allocation [Abstract]
Land, Buildings and improvements																									24,993,000	39,594,000
Acquisition-related intangible assets (in Acquired lease intangibles, net)	9,945,000
Acquisition-related intangible liabilities (in Acquired lease and other intangibles, net)	(627,000)
Total consideration	73,905,000
Business Acquisition, Cost of Acquired Entity, Cash Paid																			2,000,000
Business Acquisition, Cost of Acquired Entity, Deferred Payments																			7,200,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value																			108,000,000
Business Combination, Bargain Purchase, Gain Recognized, Amount																			$ 33,800,000								$ 6,300,000

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