ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Business Interruption Insurance Deductible				$ 100,000
Impairment of asset	8,183,000		0	6,925,000
Provision for Insurance Deductible Attributable to Loss of Rents			100,000
Insurance proceeds from involuntary conversion of asset	0		3,672,000	0
Insurance proceeds from involuntary conversion of asset, other				6,900,000
Gain on involuntary conversion of asset	0		2,368,000	0
Deferred Rent Receivables, Net	23,100,000		23,600,000
Allowance for Doubtful Accounts Receivable	6,000,000		6,100,000
Additional reserves	0		405,000
Required Distribution Rate to Maintain REIT Status (in percent)	90.00%
Loss of Anchor Tenant [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Additional reserves			400,000
Flood [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Impairment of asset				1,400,000
Funiture, Fixtures and Equipment [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Property, Plant and Equipment, Useful Life, Minimum (In Years)	5 years
Minimum [Member] | Building [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Property, Plant and Equipment, Useful Life, Minimum (In Years)	30 years
Maximum [Member] | Building [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Property, Plant and Equipment, Useful Life, Minimum (In Years)	40 years
Operating Partnership, as General Partner or Managing Member [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership Interest By General Partner or Managing Partner (in percent)	97.00%
Remaining Funds Rate of Distribution to Operating Partnership (in percent)	20.00%
Institutional Investors [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Remaining Funds Rate of Distribution to All Partners (in percent)	80.00%
Fund I and Mervyns I [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership Interest By General Partner or Managing Partner (in percent)	37.78%	[1]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Share of Capital	22.22%	[1]
General Partners' Contributed Capital	90,000,000	[1]
Managing Members' Contributed Capital	86,600,000	[1]
Limited Liability Company Llc Or Limited Partnership Lp Members Or Limited Partners, Preferred Return	9.00%	[1]
Partners' Capital Account, Distributions	86,600,000	[1]
Fund I [Member] | Granville Centre [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Impairment of asset				6,900,000
Fund I [Member] | Operating Partnership, as General Partner or Managing Member [Member] | Granville Centre [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Impairment of asset				1,500,000
Fund II and Mervyns II [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership Interest By General Partner or Managing Partner (in percent)	20.00%	[2]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Share of Capital	20.00%	[2]
General Partners' Contributed Capital	300,000,000	[2]
Managing Members' Contributed Capital	300,000,000	[2]
Limited Liability Company Llc Or Limited Partnership Lp Members Or Limited Partners, Preferred Return	8.00%	[2]
Partners' Capital Account, Distributions	131,600,000	[2]
Fund II [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Partners' Capital Account, Distributions	47,100,000	[2]
Fund III [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership Interest By General Partner or Managing Partner (in percent)	19.90%	[3]
General Partners' Committed Capital	502,500,000
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Share of Capital	19.90%	[3]
General Partners' Contributed Capital	475,000,000	[3]
Managing Members' Contributed Capital	357,500,000	[3]
Limited Liability Company Llc Or Limited Partnership Lp Members Or Limited Partners, Preferred Return	6.00%	[3]
Partners' Capital Account, Distributions	203,500,000	[3]
Fund III [Member] | Walnut Hill Plaza [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Impairment of asset	1,500,000
Fund III [Member] | Sheepshead Bay [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Impairment of asset	6,700,000
Fund III [Member] | Operating Partnership, as General Partner or Managing Member [Member] | Sheepshead Bay [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Impairment of asset	1,300,000
Mervyns I and Mervyns II [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Impairment of asset			2,000,000
Fund IV [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Ownership Interest By General Partner or Managing Partner (in percent)	23.12%
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Share of Capital	23.12%
General Partners' Contributed Capital	540,600,000
Managing Members' Contributed Capital	95,900,000
Limited Liability Company Llc Or Limited Partnership Lp Members Or Limited Partners, Preferred Return	6.00%
Partners' Capital Account, Distributions	0
Brandywine Portfolio [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Share of Capital	22.22%	[1]
Square Footage of Real Estate Property (in feet)	1,000,000
Core Portfolio [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of Retail Properties	77
Properties Owned Percentage	100.00%
Gain on involuntary conversion of asset			2,368,000
Opportunity Funds [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of Retail Properties	28
Gain on involuntary conversion of asset			$ 0
Core Portfolio and Opportunity Funds [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of Retail Properties	105

[1] Fund I and Mervyns I have returned all capital and preferred return. The Operating Partnership is now entitled to a Promote on all future cash distributions.

[2] During 2013, a distribution of $47.1 million was made to the Fund II investors, including the Operating Partnership. This amount is subject to recontribution to Fund II until December 2016, if needed to fund the on-going development and construction of existing projects.

[3] Original committed capital of Fund III was $502.5 million. During 2012, this amount was reduced to $475.0 million.