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INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES (Details) (USD $)	3 Months Ended			3 Months Ended			3 Months Ended																3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Mar. 31, 2012 Unconsolidated Affiliates [Member]	Mar. 31, 2011 Unconsolidated Affiliates [Member]	Dec. 31, 2011 Unconsolidated Affiliates [Member]	Mar. 31, 2012 Operating Partnership, as General Partner or Managing Member [Member]	Mar. 31, 2011 Operating Partnership, as General Partner or Managing Member [Member]	Mar. 31, 2012 KLA/Mervyns LLC Add-On Investments [Member]	Mar. 31, 2012 KLA A Markets LLC Add-On Investments [Member]	Mar. 31, 2012 KA-Shopko LLC [Member]	Mar. 31, 2012 Marsh and Add-On Investments [Member]	Mar. 31, 2012 KLAC Rex Venture LLC [Member]	Mar. 31, 2012 KLA/Mervyns LLC [Member]	Mar. 31, 2012 KLA A Markets LLC [Member]	Mar. 31, 2012 Mervyns I and Mervyns II [Member] KLA/Mervyns LLC Add-On Investments [Member]	Mar. 31, 2012 Mervyns I and Mervyns II [Member] KLA/Mervyns LLC [Member]	Mar. 31, 2012 Mervyns II [Member] KLA A Markets LLC Add-On Investments [Member]	Mar. 31, 2012 Mervyns II [Member] KLAC Rex Venture LLC [Member]	Mar. 31, 2012 Mervyns II [Member] KLA A Markets LLC [Member]	Mar. 31, 2012 Fund II [Member] KA-Shopko LLC [Member]	Mar. 31, 2012 Fund II [Member] Marsh and Add-On Investments [Member]	Mar. 31, 2012 Core Portfolio [Member]	Mar. 31, 2011 Core Portfolio [Member]	Mar. 31, 2012 Core Portfolio [Member] Brandywine Portfolio [Member] sqft	Mar. 31, 2012 Core Portfolio [Member] Crossroads [Member] sqft	Mar. 31, 2012 Core Portfolio [Member] Georgetown Portfolio [Member] sqft	Mar. 31, 2012 Opportunity Funds [Member]	Mar. 31, 2011 Opportunity Funds [Member]	Mar. 31, 2012 Opportunity Funds [Member] RCP Venture [Member]	Mar. 31, 2012 Opportunity Funds [Member] RCP Venture [Member] Operating Partnership, as General Partner or Managing Member [Member]	Mar. 31, 2012 Opportunity Funds [Member] Mervyns I and Mervyns II [Member] KLA/Mervyns LLC Add-On Investments [Member]	Mar. 31, 2012 Opportunity Funds [Member] Mervyns I and Mervyns II [Member] KLA/Mervyns LLC Add-On Investments [Member] Operating Partnership, as General Partner or Managing Member [Member]	Mar. 31, 2012 Opportunity Funds [Member] Mervyns I and Mervyns II [Member] KLA/Mervyns LLC [Member]	Mar. 31, 2012 Opportunity Funds [Member] Mervyns I and Mervyns II [Member] KLA/Mervyns LLC [Member] Operating Partnership, as General Partner or Managing Member [Member]	Mar. 31, 2012 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC Add-On Investments [Member]	Mar. 31, 2012 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC Add-On Investments [Member] Operating Partnership, as General Partner or Managing Member [Member]	Mar. 31, 2012 Opportunity Funds [Member] Mervyns II [Member] KLAC Rex Venture LLC [Member]	Mar. 31, 2012 Opportunity Funds [Member] Mervyns II [Member] KLAC Rex Venture LLC [Member] Operating Partnership, as General Partner or Managing Member [Member]	Mar. 31, 2012 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC [Member]	Mar. 31, 2012 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC [Member] Operating Partnership, as General Partner or Managing Member [Member]	Mar. 31, 2012 Opportunity Funds [Member] Fund II [Member] KA-Shopko LLC [Member]	Mar. 31, 2012 Opportunity Funds [Member] Fund II [Member] KA-Shopko LLC [Member] Operating Partnership, as General Partner or Managing Member [Member]	Mar. 31, 2012 Opportunity Funds [Member] Fund II [Member] Marsh and Add-On Investments [Member]	Mar. 31, 2012 Opportunity Funds [Member] Fund II [Member] Marsh and Add-On Investments [Member] Operating Partnership, as General Partner or Managing Member [Member]	Jun. 30, 2011 Opportunity Funds [Member] Fund III [Member] locations	Jun. 30, 2010 Opportunity Funds [Member] Fund III [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage																									22.20%	49.00%	50.00%																				50.00%
Square Footage of Real Estate Property (in square feet)																									1,000,000	311,000	28,000
Noncontrolling Interest, Ownership Percentage by Parent									10.50%	20.00%	20.00%	20.00%	13.30%	10.50%	18.90%	5.80%	5.80%	6.00%	13.30%	5.70%	2.00%	3.30%
Equity Method Investment and Investment Income, Dividends or Distributions	$ 1,000,000						$ 200,000
Equity Method Investments																																		26,058,000	4,901,000					20,717,000	4,239,000
Equity Method Investment, Dividends or Distributions																																		45,966,000	11,251,000					81,594,000	16,318,000
Cost Method Investments																																6,517,000	1,046,000			2,416,000	388,000	2,701,000	535,000			1,108,000	222,000	2,667,000	533,000
Investment Income, Dividend																														138,940,000	29,953,000	3,558,000	819,000			2,461,000	492,000	1,063,000	213,000			1,659,000	332,000	2,639,000	528,000
Number of Locations Owned (in locations)																																														14
Combined and Condensed Balance Sheets [Abstract]
Rental property, net				280,227,000		280,470,000
Investments in and advances to unconsolidated affiliates	85,099,000		84,568,000	133,514,000		156,421,000																								62,184,000	11,864,000
Other assets				30,932,000		29,587,000
Total assets	1,726,736,000	1,531,741,000	1,653,319,000	444,673,000		466,478,000																	661,545,000	561,728,000				936,787,000	790,439,000
Mortgage notes payable				318,757,000		319,425,000
Other liabilities	20,929,000		20,437,000	17,133,000		16,902,000
Partners' equity				108,783,000		130,151,000
Total liabilities and equity	1,726,736,000		1,653,319,000	444,673,000		466,478,000
Company's share of distributions in excess of share of income and investments in unconsolidated affiliates	(21,863,000)		(21,710,000)
Combined and Condensed Statements of Operations [Abstract]
Total revenues	39,626,000	37,447,000		12,296,000	9,582,000																		15,276,000	14,432,000				15,767,000	12,526,000
Operating and other expenses	27,972,000	24,883,000		4,454,000	3,766,000
Interest expense				4,638,000	4,016,000
Equity in (losses) earnings of unconsolidated affiliates	(56,000)	(148,000)		(1,623,000)	958,000		(56,000)	(148,000)
Depreciation and amortization	9,141,000	7,634,000		2,272,000	1,869,000																		(3,747,000)	(3,258,000)				(4,504,000)	(3,536,000)
Income from continuing operations	2,823,000	4,908,000		(691,000)	889,000
Company's share of net income (loss)							42,000	(50,000)
Amortization of excess investment							$ (98,000)	$ (98,000)

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