Future Minimum Rents and Lease Payments - Ground Lease Terms for Properties Held (Details) - Ground lease	6 Months Ended
Jun. 30, 2020 USD ($) extensionOption
3400 Hillview
Operating Leased Assets [Line Items]
Minimum annual rent calculation, percent of land fair market value	10.00%
Minimum annual rent calculation, cumulative increases in consumer price index \| $	$ 1,000,000.0
Minimum annual rent calculation, percent of consumer price index over the next 5 years	75.00%
Minimum annual rent calculation, percent of consumer price index, thereafter	75.00%
Minimum annual rent calculation, percent of adjusted gross income	24.125%
Clocktower Square
Operating Leased Assets [Line Items]
Minimum annual rent adjustments, frequency	10 years
Minimum annual rent calculation, percent of adjusted gross income	25.00%
Minimum rent adjustments, percent of average annual participation rent over five years	60.00%
Del Amo
Operating Leased Assets [Line Items]
Minimum annual rent \| $	$ 1.00
Ferry Building
Operating Leased Assets [Line Items]
Minimum annual rent adjustments, frequency	5 years
Cumulative change in CPI, floor, percent	10.00%
Cumulative change in CPI, cap, percent	20.00%
Ferry Building, parking lot
Operating Leased Assets [Line Items]
Cumulative change in CPI, floor, percent	2.00%
Cumulative change in CPI, cap, percent	4.00%
Renewal term	10 years
Foothill Research Center
Operating Leased Assets [Line Items]
Minimum annual rent calculation, percent of land fair market value	10.00%
Minimum annual rent calculation, percent of adjusted gross income	24.125%
Minimum annual rent calculation, percent of consumer price index	75.00%
3176 Porter
Operating Leased Assets [Line Items]
Minimum annual rent calculation, percent of land fair market value	10.00%
Minimum annual rent calculation, percent of adjusted gross income	24.125%
Minimum annual rent calculation, percent of consumer price index	75.00%
Metro Center
Operating Leased Assets [Line Items]
Minimum annual rent calculation, percent of land fair market value	7.233%
Minimum annual rent adjustments, frequency	10 years
Renewal term	11 years
Number of options to extend \| extensionOption	4
Page Mill Center
Operating Leased Assets [Line Items]
Minimum annual rent calculation, percent of adjusted gross income	25.00%
Minimum rent adjustments, percent of average annual participation rent over five years	60.00%
Page Mill Hill
Operating Leased Assets [Line Items]
Minimum annual rent adjustments, frequency	10 years
Minimum annual rent calculation, percent of annual rent, previous 7 years	60.00%
Minimum annual rent adjustments, percent of annual rent, previous 7 years	60.00%
Palo Alto Square
Operating Leased Assets [Line Items]
Minimum annual rent adjustments, frequency	10 years
Minimum annual rent calculation, percent of adjusted gross income	25.00%
Minimum annual rent adjustments, percent of annual rent, previous 5 years	50.00%
Sunset Gower Studios
Operating Leased Assets [Line Items]
Minimum annual rent calculation, percent of land fair market value	7.50%
Minimum annual rent adjustments, frequency	7 years
Techmart
Operating Leased Assets [Line Items]
Minimum annual rent adjustments, frequency	5 years
Renewal term	10 years
Number of options to extend \| extensionOption	2
Minimum rent adjustments, percent	10.00%

Lessor Leasing Arrangements, Operating Leases, Frequency Of Rent Adjustments

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Lessor Leasing Arrangements, Operating Leases, Minimum Annual Rent

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Lessor Leasing Arrangements, Operating Leases, Minimum Annual Rent Adjustments, Percent Of Average Annual Participation Rent Over Five Years

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Lessor Leasing Arrangements, Operating Leases, Minimum Annual Rent Adjustments, Percent Of Average Annual Percentage Rent For Previous Five Years

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Lessor Leasing Arrangements, Operating Leases, Minimum Annual Rent Adjustments, Percent Of Average Annual Percentage Rent For Previous Seven Years

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Lessor Leasing Arrangements, Operating Leases, Minimum Annual Rent Calculation, Cap Percent

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Lessor Leasing Arrangements, Operating Leases, Minimum Annual Rent Calculation, Floor Percent

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Lessor Leasing Arrangements, Operating Leases, Minimum Annual Rent Calculation, Percent Of Land Fair Market Value

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Lessor Leasing Arrangements, Operating Leases, Rent Adjustments, Percent

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Lessor, Operating Lease, Number Of Options To Extend

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Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919359-209981

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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