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SIGNIFICANT ACCOUNTING POLICIES (Details)
12 Months Ended
Dec. 31, 2019
a
Integer
Dec. 31, 2020
Dec. 31, 2018
Controlling interest joint ventures & equity method investees      
Percentage of assets, liabilities, revenues, and expenses of the buildings held in joint ventures with the noncontrolling interests   100.00%  
Number of new joint venture agreements | Integer 2    
University Business Center 120 and 130 [Member]      
Controlling interest joint ventures & equity method investees      
Less Than Wholly Owned Joint Venture Investment Ownership Percentage     80.00%
University Business Center 120 [Member]      
Controlling interest joint ventures & equity method investees      
Less Than Wholly Owned Joint Venture Investment Ownership Percentage 80.00%    
Less Than Wholly Owned Joint Venture Investment Ownership Percentage   80.00%  
Less Than Wholly Owned Joint Venture Investment Ownership Percentage Sold   80.00%  
Industry Distribution Center II - undivided tenant-in-common interest [Member]      
Controlling interest joint ventures & equity method investees      
Tenant-in-common interest in Industry Distribution Center II (in hundredths)   50.00%  
Real Estate Properties [Domain] | Miramar Land [Member]      
Controlling interest joint ventures & equity method investees      
Size (in acres) of land acquired 6.5    
Less Than Wholly Owned Joint Venture Investment Ownership Percentage 95.00% 95.00%  
Real Estate Properties [Domain] | Otay Mesa Land      
Controlling interest joint ventures & equity method investees      
Size (in acres) of land acquired 41.6    
Less Than Wholly Owned Joint Venture Investment Ownership Percentage 99.00% 99.00%