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Future Minimum Base Rents and Lease Payments Future Minimum Rents - Ground lease Terms Related to Properties That Are Held Subject to Long-term Noncancellable Ground Lease Obligations (Details) - Ground Lease
12 Months Ended
Dec. 31, 2017
USD ($)
3400 Hillview  
Operating Leased Assets  
Minimum annual rent calculation, percent of land fair market value 10.00%
Minimum annual rent calculation, cumulative increases in consumer price index $ 1,000,000
Minimum annual rent calculation, percent of consumer price index over the next 5 years 75.00%
Minimum annual rent calculation, percent of consumer price index, thereafter 75.00%
Minimum annual rent calculation, percent of adjusted gross income 24.125%
9300 Wilshire  
Operating Leased Assets  
Minimum annual rent calculation, percent 6.00%
Clocktower Square  
Operating Leased Assets  
Minimum annual rent calculation, percent of adjusted gross income 25.00%
Minimum annual rent calculation, frequency of rent adjustments 10 years
Del Amo Office  
Operating Leased Assets  
Minimum annual rent calculation, annual rent $ 1
Foothill Research Center  
Operating Leased Assets  
Minimum annual rent calculation, percent of land fair market value 10.00%
Minimum annual rent calculation, percent of adjusted gross income 24.125%
Minimum annual rent calculation, percent of consumer price index 75.00%
3176 Porter (formerly Lockheed)  
Operating Leased Assets  
Minimum annual rent calculation, percent of land fair market value 10.00%
Minimum annual rent calculation, percent of adjusted gross income 24.125%
Minimum annual rent calculation, percent of consumer price index 75.00%
Metro Center  
Operating Leased Assets  
Minimum annual rent calculation, percent of land fair market value 7.233%
Minimum annual rent calculation, frequency of rent adjustments 10 years
Page Mill Center  
Operating Leased Assets  
Minimum annual rent calculation, percent of adjusted gross income 25.00%
Page Mill Hill  
Operating Leased Assets  
Minimum annual rent calculation, frequency of rent adjustments 10 years
Minimum annual rent calculation, percent of annual rent, previous 7 years 60.00%
Palo Alto Square  
Operating Leased Assets  
Minimum annual rent calculation, percent of adjusted gross income 25.00%
Minimum annual rent calculation, frequency of rent adjustments 10 years
Sunset Gower Studios  
Operating Leased Assets  
Minimum annual rent calculation, percent of land fair market value 7.50%
Minimum annual rent calculation, frequency of rent adjustments 7 years
Techmart Commerce Center  
Operating Leased Assets  
Minimum annual rent calculation, percent 10.00%
Minimum annual rent calculation, frequency of rent adjustments 5 years