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ACQUISITIONS AND DISPOSITIONS - Disposals (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
ft²
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
ft²
Sep. 30, 2018
USD ($)
disposition
Disposal Group        
Ownership sold, percentage     100.00%  
Disposed Property Information        
Sales Price     $ 941,032,000 $ 0
Gain on sale of real estate $ 302,000 $ 0 433,104,000 0
Impairment of real estate 0 $ 0 69,000,000 $ 0
Extinguishment of noncontrolling interests as a result of the sale $ 113,000   113,000  
Number of dispositions during the period | disposition       0
Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Disposed Property Information        
Sales Price     990,996,000  
Transaction Costs     18,350,000  
Gain on sale of real estate     $ 433,104,000  
March Oakland Properties, Oakland, CA | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Disposed Property Information        
Square Feet | ft² 975,596   975,596  
Sales Price     $ 512,016,000  
Transaction Costs     8,971,000  
Gain on sale of real estate     $ 289,779,000  
830 1st Street, Washington, D.C. | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Disposed Property Information        
Square Feet | ft² 247,337   247,337  
Sales Price     $ 116,550,000  
Transaction Costs     2,438,000  
Gain on sale of real estate     $ 45,710,000  
260 Townsend Street, San Francisco, CA | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Disposed Property Information        
Square Feet | ft² 66,682   66,682  
Sales Price     $ 66,000,000  
Transaction Costs     2,539,000  
Gain on sale of real estate     $ 42,092,000  
1333 Broadway, Oakland, CA | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Disposed Property Information        
Square Feet | ft² 254,523   254,523  
Sales Price     $ 115,430,000  
Transaction Costs     658,000  
Gain on sale of real estate     $ 55,221,000  
Union Square Properties,Washington, D.C. | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Disposed Property Information        
Square Feet | ft² 630,650   630,650  
Sales Price     $ 181,000,000  
Transaction Costs     3,744,000  
Gain on sale of real estate     $ 302,000