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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Narrative) (Details)
12 Months Ended
May 09, 2012
USD ($)
Dec. 31, 2019
USD ($)
unit
property
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jul. 06, 2017
a
May 02, 2014
ft²
Schedule of Equity Method Investments [Line Items]            
Initial capital contribution   $ 31,845,000 $ 1,320,000 $ 0    
Income from NIP   0 428,000 2,073,000    
Investments in unconsolidated joint ventures   78,276,000 44,869,000      
Joint Venture            
Schedule of Equity Method Investments [Line Items]            
Ownership interest         55.00%  
353 Sacramento | Office Properties | Disposed of by Sale            
Schedule of Equity Method Investments [Line Items]            
Ownership interest         45.00%  
Area of land | a         0.35  
110 William JV Partner            
Schedule of Equity Method Investments [Line Items]            
Return of capital       38,800,000    
Income from NIP   5,200,000        
Migdal Members            
Schedule of Equity Method Investments [Line Items]            
Ownership interest         45.00%  
NIP Joint Venture            
Schedule of Equity Method Investments [Line Items]            
Initial capital contribution $ 8,000,000.0          
Return of capital   300,000 2,200,000 1,600,000    
Distributions     2,600,000 3,700,000    
Income from NIP     400,000 2,100,000    
Investments in unconsolidated joint ventures   $ 1,225,000 1,476,000      
NIP Joint Venture | Maximum            
Schedule of Equity Method Investments [Line Items]            
Ownership interest   5.00%        
110 William Joint Venture            
Schedule of Equity Method Investments [Line Items]            
Ownership interest   60.00%       60.00%
Return of capital       58,200,000    
Rentable square feet | ft²           928,157
Area of land | ft²           0.8
Investments in unconsolidated joint ventures   $ 0 325,000      
Amortization of acquisition costs     1,400,000      
Equity in income of unconsolidated joint venture   7,800,000        
Equity in income (loss) of unconsolidated joint venture   $ 7,800,000        
110 William Joint Venture | 110 William JV Partner            
Schedule of Equity Method Investments [Line Items]            
Ownership interest           40.00%
353 Sacramento Joint Venture            
Schedule of Equity Method Investments [Line Items]            
Ownership interest   55.00%        
Distributions   $ 0 1,300,000 $ 0    
Investments in unconsolidated joint ventures   42,214,000 43,068,000      
Pacific Oak Opportunity Zone Fund I            
Schedule of Equity Method Investments [Line Items]            
Investments in unconsolidated joint ventures   $ 20,846,000 $ 0      
Number of units in real estate property | unit   91        
Investments   $ 20,600,000        
Acquisition related costs   $ 200,000        
Number of Joint Venture with Real Estate Under Development | property   2