Future Minimum Lease Payments - Schedule of Ground Leases (Details) - Ground Lease	6 Months Ended
Jun. 30, 2017 USD ($)
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
9300 Wilshire
Operating Leased Assets [Line Items]
Minimum annual rent calculation, percent of increase (as a percent)	6.00%
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%
Del Amo Office
Operating Leased Assets [Line Items]
Lease rent expense	$ 1
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%
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%
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%
Page Mill Center
Operating Leased Assets [Line Items]
Percentage annual rent calculation, percent of AGI less minimum annual rent (as a percent)	25.00%
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%
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%
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%
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%

Lessee Leasing Arrangements, Operating Leases, Frequency Of Rent Adjustments

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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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