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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Four Tower Bridge Acquisition (Details)
$ in Thousands
12 Months Ended
Jan. 05, 2018
USD ($)
ft²
Dec. 31, 2020
USD ($)
ft²
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 21, 2020
Schedule of Equity Method Investments [Line Items]          
Sale of ownership interest percentage         60.00%
Area of real estate property | ft²   13,852,464      
Net gain on real estate venture transactions   $ 75 $ 11,639 $ 142,233  
Four Tower Bridge          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage 35.00%        
Area of real estate property | ft² 86,021        
Real estate property debt $ 9,700        
Net gain on real estate venture transactions $ 11,600        
Seven Tower Bridge          
Schedule of Equity Method Investments [Line Items]          
Sale of ownership interest percentage 20.00%