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Future Minimum Base Rents and Lease Payments Future Minimum Rents - Narrative (Details) - USD ($)
 6 Months Ended
Mar. 31, 2011
Jun. 30, 2015
Aug. 17, 2007
Sunset Gower      
Ground Leases      
Ground lease monthly rent $ 31,000   $ 14,000
Period for rental rate adjustment 7 years    
Del Amo      
Ground Leases      
Annual rent   $ 1.00  
Location 9300 Wilshire Boulevard      
Ground Leases      
Minimum annual rent   $ 75,000  
Percent of gross rentals   6.00%  
Location 222 Kearny Street      
Ground Leases      
Minimum annual rent   $ 975,000  
Location 222 Kearny Street | Greater of      
Ground Leases      
Minimum annual rent   $ 975,000  
Percent of operating income   20.00%  
Operating income amount   $ 8,000,000