Future Minimum Base Rents and Lease Payments Future Minimum Rents - Schedule of Ground Leases (Details) - USD ($)	3 Months Ended
Mar. 31, 2017	Dec. 27, 2016
11601 Wilshire
Operating Leased Assets [Line Items]
Agreement to purchase outstanding interest in land		$ 50,000,000
Ground Lease \| 11601 Wilshire
Operating Leased Assets [Line Items]
Frequency of rent adjustments (in years)	5 years
Minimum annual rent calculation, annual increase	$ 50,000
Ground Lease \| 3400 Hillview
Operating Leased Assets [Line Items]
Minimum annual rent calculation, percent of fair market value (as a percent)	10.00%
Percentage annual rent calculation, percent of AGI less minimum annual rent (as a percent)	24.125%
Minimum annual rent calculation, percent of CPI, next five years (as a percent)	75.00%
Minimum annual rent calculation, percent of CPI, thereafter (as a percent)	75.00%
Minimum annual rent calculation, cumulative increases in consumer price index	$ 1,000,000
Ground Lease \| 9300 Wilshire
Operating Leased Assets [Line Items]
Minimum annual rent calculation, percent of increase (as a percent)	6.00%
Ground Lease \| Clocktower Square
Operating Leased Assets [Line Items]
Frequency of rent adjustments (in years)	10 years
Percentage annual rent calculation, percent of AGI less minimum annual rent (as a percent)	25.00%
Ground Lease \| Del Amo Office
Operating Leased Assets [Line Items]
Lease rent expense	$ 1
Ground Lease \| Foothill Research Center
Operating Leased Assets [Line Items]
Minimum annual rent calculation, percent of fair market value (as a percent)	10.00%
Percentage annual rent calculation, percent of AGI less minimum annual rent (as a percent)	24.125%
Minimum annual rent calculation, percent of CPI (as a percent)	75.00%
Ground Lease \| Lockheed
Operating Leased Assets [Line Items]
Minimum annual rent calculation, percent of fair market value (as a percent)	10.00%
Percentage annual rent calculation, percent of AGI less minimum annual rent (as a percent)	24.125%
Minimum annual rent calculation, percent of CPI (as a percent)	75.00%
Ground Lease \| Metro Center
Operating Leased Assets [Line Items]
Frequency of rent adjustments (in years)	10 years
Minimum annual rent calculation, percent of fair market value (as a percent)	7.233%
Ground Lease \| Page Mill Center
Operating Leased Assets [Line Items]
Percentage annual rent calculation, percent of AGI less minimum annual rent (as a percent)	25.00%
Ground Lease \| Page Mill Hill
Operating Leased Assets [Line Items]
Frequency of rent adjustments (in years)	10 years
Minimum annual rent calculation, percent of annual rent (as a percent)	60.00%
Ground Lease \| Palo Alto Square
Operating Leased Assets [Line Items]
Frequency of rent adjustments (in years)	10 years
Percentage annual rent calculation, percent of AGI less minimum annual rent (as a percent)	25.00%
Ground Lease \| Sunset Gower Studios
Operating Leased Assets [Line Items]
Frequency of rent adjustments (in years)	7 years
Minimum annual rent calculation, percent of fair market value (as a percent)	7.50%
Ground Lease \| Techmart Commerce Center
Operating Leased Assets [Line Items]
Frequency of rent adjustments (in years)	5 years
Minimum annual rent calculation, percent of increase (as a percent)	10.00%

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