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SUBSEQUENT EVENTS (Details) - USD ($)
1 Months Ended 12 Months Ended
Jan. 31, 2016
Dec. 31, 2015
Feb. 01, 2016
Subsequent Event [Member] | Gotham Plaza [Member] | Manhattan, New York [Member]      
Subsequent Event [Line Items]      
Percent Owned 49.00%    
Purchase Price $ 39,800,000    
Percentage of long-term debt assumed 49.00%    
Long-term debt assumed $ 21,400,000    
Fund IV [Member]      
Subsequent Event [Line Items]      
Purchase Price   $ 146,100,000  
Fund IV [Member] | Subsequent Event [Member] | Chicago, Illinois [Member]      
Subsequent Event [Line Items]      
Notes Receivable and Preferred Equity Investments, Fair Value     $ 14,000,000
Rate of return percentage     15.30%
Fund IV [Member] | Subsequent Event [Member] | Restaurant at Fort Point [Member] | Boston, Massachusetts [Member]      
Subsequent Event [Line Items]      
Purchase Price $ 11,500,000    
Fund IV [Member] | Subsequent Event [Member] | 1964 Union Street [Member] | San Francisco, California [Member]      
Subsequent Event [Line Items]      
Percent Owned 90.00%    
Purchase Price $ 2,000,000    
Fund III [Member] | Subsequent Event [Member] | Cortlandt Towne Center [Member]      
Subsequent Event [Line Items]      
Percentage of disposition 65.00%    
Consideration received $ 107,300,000    
Fund II [Member]      
Subsequent Event [Line Items]      
Purchase Price   $ 100,800,000  
Term Loan [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Debt issued amount $ 50,000,000.0    
Unconsolidated Affiliates [Member] | Operating Partnership, as General Partner or Managing Member [Member] | Fund II [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Percent Owned 28.30%    
Purchase Price $ 18,400,000    
Percentage of acquire additional interest in subsidiaries 8.30%    
Minimum [Member] | LIBOR [Member] | Term Loan [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Borrowings, interest rate basis spread 1.30%    
Maximum [Member] | LIBOR [Member] | Term Loan [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Borrowings, interest rate basis spread 1.90%