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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Investment in 353 Sacramento Joint Venture) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jul. 06, 2017
Migdal Members        
Schedule of Equity Method Investments [Line Items]        
Ownership %       45.00%
Joint Venture        
Schedule of Equity Method Investments [Line Items]        
Ownership %       55.00%
353 Sacramento Joint Venture        
Schedule of Equity Method Investments [Line Items]        
Ownership % 55.00%      
Distributions $ 0 $ 1,300,000 $ 0