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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES - Investments - Additional Information (Details)
3 Months Ended 6 Months Ended
May 18, 2012
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
May 02, 2014
ft²
Schedule of Equity Method Investments [Line Items]              
Contributions to joint venture       $ 434,000 $ 5,000,000    
Income from unconsolidated joint venture   $ 0 $ 0 52,000 0    
Investments in unconsolidated entities   78,478,000   78,478,000   $ 78,276,000  
Equity in income of unconsolidated joint venture       993,000 7,096,000    
Equity in income (loss) of unconsolidated entities   $ 665,000 (215,000) 993,000 7,096,000    
110 William JV Partner              
Schedule of Equity Method Investments [Line Items]              
Income from unconsolidated joint venture       $ 0 5,200,000    
NIP Joint Venture              
Schedule of Equity Method Investments [Line Items]              
Contributions to joint venture $ 8,000,000.0            
Ownership percentage   0.00%   0.00%      
Distributions     $ 300,000 $ 1,300,000 300,000    
Income from unconsolidated joint venture       100,000      
Return of capital       1,200,000      
Investments in unconsolidated entities   $ 0   $ 0   1,225,000  
NIP Joint Venture | Maximum              
Schedule of Equity Method Investments [Line Items]              
Ownership percentage   5.00%   5.00%      
110 William Joint Venture              
Schedule of Equity Method Investments [Line Items]              
Ownership percentage   60.00%   60.00%      
Rentable square feet | ft²             928,157
Area of land | ft²             0.8
Investments in unconsolidated entities   $ 0   $ 0   $ 0  
Equity in income of unconsolidated joint venture         7,800,000    
Equity in income (loss) of unconsolidated entities         $ 7,800,000    
110 William Joint Venture | 110 William JV Partner              
Schedule of Equity Method Investments [Line Items]              
Ownership percentage             60.00%
110 William Joint Venture | 110 William JV Partner | 110 William Joint Venture              
Schedule of Equity Method Investments [Line Items]              
Noncontrolling interest             40.00%