Future Minimum Base Rents and Lease Payments Future Minimum Rents - Schedule of Ground Leases (Details) - Ground Lease	9 Months Ended
Sep. 30, 2016 USD ($)
Sunset Gower
Operating Leased Assets [Line Items]
Frequency of rent adjustments	7 years
Minimum annual rent calculation, percent of fair market value	7.50%
Del Amo
Operating Leased Assets [Line Items]
Lease rent expense	$ 1
9300 Wilshire Blvd.
Operating Leased Assets [Line Items]
Minimum annual rent calculation, percent of increase	6.00%
222 Kearny Street
Operating Leased Assets [Line Items]
Lease rent expense	$ 975,000
Minimum annual rent calculation, percent of increase	20.00%
Minimum annual rent calculation, operating income during lease year	$ 8,000,000
Page Mill Center
Operating Leased Assets [Line Items]
Percentage annual rent calculation, percent of AGI less minimum annual rent	25.00%
Clocktower Square Bldg
Operating Leased Assets [Line Items]
Frequency of rent adjustments	10 years
Percentage annual rent calculation, percent of AGI less minimum annual rent	25.00%
Palo Alto Square
Operating Leased Assets [Line Items]
Frequency of rent adjustments	10 years
Percentage annual rent calculation, percent of AGI less minimum annual rent	25.00%
Lockheed Building
Operating Leased Assets [Line Items]
Minimum annual rent calculation, percent of fair market value	10.00%
Percentage annual rent calculation, percent of AGI less minimum annual rent	24.125%
Minimum annual rent calculation, percent of CPI	75.00%
Foothill Research Ctr
Operating Leased Assets [Line Items]
Minimum annual rent calculation, percent of fair market value	10.00%
Percentage annual rent calculation, percent of AGI less minimum annual rent	24.125%
Minimum annual rent calculation, percent of CPI	75.00%
3400 Hillview
Operating Leased Assets [Line Items]
Minimum annual rent calculation, percent of fair market value	10.00%
Percentage annual rent calculation, percent of AGI less minimum annual rent	24.125%
Minimum annual rent calculation, percent of CPI, next five years	75.00%
Minimum annual rent calculation, percent of CPI, thereafter	75.00%
Minimum annual rent calculation, cumulative increases in consumer price index	$ 1,000,000
Metro Center Tower
Operating Leased Assets [Line Items]
Frequency of rent adjustments	10 years
Minimum annual rent calculation, percent of fair market value	7.233%
Techmart Commerce Center
Operating Leased Assets [Line Items]
Frequency of rent adjustments	5 years
Minimum annual rent calculation, percent of increase	10.00%
11601 Wilshire Boulevard Office Building
Operating Leased Assets [Line Items]
Frequency of rent adjustments	5 years
Minimum annual rent calculation, annual increase	$ 50,000

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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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