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ACQUISITIONS AND DISPOSITIONS - 2018 Disposals (Details)
$ in Thousands
Jan. 18, 2018
USD ($)
ft²
Dec. 29, 2017
USD ($)
ft²
Dec. 31, 2017
USD ($)
9460 Wilshire Boulevard, Beverly Hills, CA      
Business Acquisition [Line Items]      
Percentage of ownership acquired 100.00%    
Square Feet | ft² 91,750    
Purchase price $ 132,000    
Escrow deposit     $ 20,000
Closing costs and assumption of liabilities     $ 48
9460 Wilshire Boulevard in Los Angeles, California - Office Space      
Business Acquisition [Line Items]      
Square Feet | ft² 68,866    
9460 Wilshire Boulevard in Los Angeles, California - Retail Space      
Business Acquisition [Line Items]      
Square Feet | ft² 22,884    
1130 Howard Street, San Francisco, CA      
Business Acquisition [Line Items]      
Percentage of ownership acquired   100.00%  
Square Feet | ft²   21,194  
Purchase price   $ 17,717  
Closing costs and assumption of liabilities   $ 1,915