Future Minimum Rents and Lease Payments - Additional Information (Details)	3 Months Ended
Mar. 31, 2019 USD ($)
Lessor, Lease, Description [Line Items]
Remaining 2019	$ 413,038,000
2020	544,738,000
2021	530,578,000
2022	492,413,000
2023	459,538,000
Thereafter	2,139,055,000
TOTAL	4,579,360,000
Non-Cancellable
Lessor, Lease, Description [Line Items]
Remaining 2019	410,310,000
2020	530,493,000
2021	496,431,000
2022	453,315,000
2023	421,940,000
Thereafter	2,052,986,000
TOTAL	4,365,475,000
Subject to Early Termination Options
Lessor, Lease, Description [Line Items]
Remaining 2019	2,728,000
2020	14,245,000
2021	34,147,000
2022	39,098,000
2023	37,598,000
Thereafter	86,069,000
TOTAL	213,885,000
Ground Lease
Lessor, Lease, Description [Line Items]
Remaining 2019	13,808,000
2020	18,411,000
2021	18,411,000
2022	18,411,000
2023	18,489,000
Thereafter	501,924,000
TOTAL	$ 589,454,000
Ground Lease \| 3400 Hillview
Lessor, Lease, Description [Line Items]
Percent of AGI added to ground rent	24.125%
Percnet of land fair market value	10.00%
Percent of CPI over the next five years	75.00%
Percent of CPI after 5 years	75.00%
Cumulative increases in CPI input amount	$ 1,000,000
Ground Lease \| Clocktower Square
Lessor, Lease, Description [Line Items]
Percent of AGI added to ground rent	25.00%
Frequency of rent adjustments	10 years
Ground Lease \| Del Amo
Lessor, Lease, Description [Line Items]
Operating lease, annual rental expense	$ 1
Ground Lease \| Ferry Building
Lessor, Lease, Description [Line Items]
Frequency of rent adjustments	5 years
Minimum annual rent calculation, floor percent	10.00%
Minimum annual rent calculation, cap, percent	20.00%
Minimum annual rent calculation, ground leases, floor percent	2.00%
Minimum annual rent calculation, ground leases, cap percent	4.00%
Ground Lease \| Foothill Research Center
Lessor, Lease, Description [Line Items]
Percent of AGI added to ground rent	24.125%
Percnet of land fair market value	10.00%
Minimum annual rent calculation, percent of CPI	75.00%
Ground Lease \| 3176 Porter
Lessor, Lease, Description [Line Items]
Percent of AGI added to ground rent	24.125%
Percnet of land fair market value	10.00%
Minimum annual rent calculation, percent of CPI	75.00%
Ground Lease \| Metro Center
Lessor, Lease, Description [Line Items]
Percnet of land fair market value	7.233%
Frequency of rent adjustments	10 years
Ground Lease \| Page Mill Center
Lessor, Lease, Description [Line Items]
Percent of AGI added to ground rent	25.00%
Ground Lease \| Page Mill Hill
Lessor, Lease, Description [Line Items]
Frequency of rent adjustments	10 years
Percent of annual rent calculation, previous 7 years	60.00%
Ground Lease \| Palo Alto Square
Lessor, Lease, Description [Line Items]
Percent of AGI added to ground rent	25.00%
Frequency of rent adjustments	10 years
Ground Lease \| Sunset Gower Studios
Lessor, Lease, Description [Line Items]
Percnet of land fair market value	7.50%
Frequency of rent adjustments	7 years
Ground Lease \| Techmart
Lessor, Lease, Description [Line Items]
Frequency of rent adjustments	5 years
Minimum annual rent calculation, percent	10.00%

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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