Future Minimum Rents and Lease Payments - Additional Information (Details)	6 Months Ended
Jun. 30, 2019 USD ($)
Lessor, Lease, Description [Line Items]
Remainder 2019	$ 282,079,000
2020	562,465,000
2021	551,425,000
2022	512,214,000
2023	476,129,000
Thereafter	2,197,463,000
TOTAL	4,581,775,000
Non-Cancellable
Lessor, Lease, Description [Line Items]
Remainder 2019	279,954,000
2020	547,430,000
2021	517,039,000
2022	472,492,000
2023	437,760,000
Thereafter	2,110,308,000
TOTAL	4,364,983,000
Subject to Early Termination Options
Lessor, Lease, Description [Line Items]
Remainder 2019	2,125,000
2020	15,035,000
2021	34,386,000
2022	39,722,000
2023	38,369,000
Thereafter	87,155,000
TOTAL	216,792,000
Ground Lease
Lessor, Lease, Description [Line Items]
Remaining 2019	9,211,000
2020	18,422,000
2021	18,422,000
2022	18,422,000
2023	18,499,000
Thereafter	501,926,000
TOTAL	$ 584,902,000
Ground Lease \| 3400 Hillview
Lessor, Lease, Description [Line Items]
Percent of AGI added to ground rent	24.125%
Percent 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%
Minimum annual rent calculation, renewal periods	10 years
Ground Lease \| Foothill Research Center
Lessor, Lease, Description [Line Items]
Percent of AGI added to ground rent	24.125%
Percent 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%
Percent 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]
Percent 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]
Percent 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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-SubTopic 20
-Section 50
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