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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES - Investment in 353 Sacramento Joint Venture (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jul. 06, 2017
a
ft²
Migdal Members        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage       45.00%
Joint Venture        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage       55.00%
353 Sacramento Joint Venture        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage 55.00% 55.00%    
Distributions | $ $ 0 $ 0 $ 1,300,000  
353 Sacramento Joint Venture | Office Properties | Disposed of by Sale        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage       45.00%
Net rentable area | ft²       284,751
Area of land | a       0.35