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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES - Additional Information (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2012
Jun. 30, 2018
USD ($)
property
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
property
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Aug. 07, 2015
USD ($)
Mar. 22, 2013
Schedule of Equity Method Investments [Line Items]                
Investments in unconsolidated joint ventures   $ 35,302,000   $ 35,302,000   $ 35,441,000    
Proceeds from distribution of investment       1,250,000 $ 0      
Expenses from investment   (2,801,000) $ (1,686,000) (6,373,000) (7,484,000)      
Grace Lake JV, LLC                
Schedule of Equity Method Investments [Line Items]                
Investments in unconsolidated joint ventures   $ 4,192,000   4,192,000   4,908,000    
Proceeds from distribution of investment       $ 1,300,000        
Percentage of equity kicker received with right to convert upon capital event 25.00%              
Preferred return used to determine distribution of excess cash flow (as a percent)       8.25%        
Percentage of distribution of all excess cash flows and all disposition proceeds upon any sale entitled after consideration of preferred return and return of equity remaining in the property to operating partner       25.00%        
Percentage of investment of operating partner       81.00%        
Grace Lake JV, LLC | LP Units                
Schedule of Equity Method Investments [Line Items]                
Ownership interest (as a percent)               19.00%
Grace Lake JV, LLC | Limited liability company                
Schedule of Equity Method Investments [Line Items]                
Ownership interest (as a percent)   19.00%   19.00%        
24 Second Avenue Holdings LLC                
Schedule of Equity Method Investments [Line Items]                
Investments in unconsolidated joint ventures   $ 31,110,000   $ 31,110,000   30,533,000    
Ownership interest (as a percent)             73.80%  
Amount contributed             $ 31,100,000  
Profit multiplier ratio             1.70  
Ownership percentage after achievement of profit multiplier ratio             50.00%  
Expenses from investment   (300,000) (300,000) (500,000) (600,000)      
Interest costs capitalized   400,000 $ 300,000 700,000 $ 600,000      
24 Second Avenue Holdings LLC | Operating Partner                
Schedule of Equity Method Investments [Line Items]                
Ownership interest (as a percent)             26.20%  
Ownership percentage after achievement of profit multiplier ratio             50.00%  
24 Second Avenue Holdings LLC | Co-venturer                
Schedule of Equity Method Investments [Line Items]                
Loans payable outstanding from unconsolidated joint venture   43,700,000   43,700,000   $ 36,500,000    
24 Second Avenue Holdings LLC | Co-venturer | Construction Loan                
Schedule of Equity Method Investments [Line Items]                
Committed amount on credit agreement   50,465,000   50,465,000        
Outstanding amount under credit agreement   43,700,000   43,700,000        
Remaining borrowing capacity under credit agreement   $ 0   $ 0        
Apartment Building | 24 Second Avenue Holdings LLC                
Schedule of Equity Method Investments [Line Items]                
Number of real estate properties | property   31   31        
Number of real estate properties, under contract | property   15   15        
Real estate properties, under contract   $ 38,300,000   $ 38,300,000        
Real estate properties, under contract, deposit   10.00%   10.00%        
Other | 24 Second Avenue Holdings LLC                
Schedule of Equity Method Investments [Line Items]                
Number of real estate properties | property   1   1