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INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES - Core Portfolio (Details) - Jun. 30, 2015 - Core Portfolio - ft² ft² in Thousands	Total
Crossroads
Schedule of Equity Method Investments [Line Items]
Equity ownership percentage	49.00%
Square footage of real estate property (in square feet)	311
Georgetown Portfolio
Schedule of Equity Method Investments [Line Items]
Equity ownership percentage	50.00%
Square footage of real estate property (in square feet)	28
Chicago Street Retail Portfolio
Schedule of Equity Method Investments [Line Items]
Equity ownership percentage	88.43%
Square footage of real estate property (in square feet)	87
Route 202 Shopping Center
Schedule of Equity Method Investments [Line Items]
Square footage of real estate property (in square feet)	20
Percentage of interests acquired	77.78%

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