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ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details)
9 Months Ended
Sep. 30, 2016
USD ($)
business
Sep. 30, 2015
USD ($)
ft²
Business Acquisition    
Number of acquisitions | business 0  
Acquisition related expenses $ 0 $ 102,000
Parking Lot - 2 Kaiser Plaza, Oakland, CA    
Business Acquisition    
Interests acquired, percentage   100.00%
Net rentable area | ft²   44,642
Purchase price   $ 11,143,000