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Organization and Ownership - Narrative (Details) | 12 Months Ended
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Dec. 31, 2021 ft² a developmentSite property_partnership residential_unit building property | Dec. 31, 2020
Real Estate Properties [Line Items] |  |
Lease-up properties occupancy percentage | 95.00% |
Lease-up properties occupancy duration | 1 year |
Rentable square feet (unaudited) | ft² | 15,456,528 |
101 First LLC and 303 Second LLC |  |
Real Estate Properties [Line Items] |  |
Ownership interest | 56.00% |
Redwood LLC |  |
Real Estate Properties [Line Items] |  |
Ownership interest | 93.00% |
Operating Partnership |  |
Real Estate Properties [Line Items] |  |
Ownership interest (percent) | 99.00% | 99.00%
Operating Partnership | Non-Affiliated Investors |  |
Real Estate Properties [Line Items] |  |
Ownership interest (percent) | 1.00% | 1.00%
San Francisco, California | 101 First LLC and 303 Second LLC |  |
Real Estate Properties [Line Items] |  |
Number of properties | building | 1 |
Number of buildings | building | 1 |
Redwood City, California | Redwood LLC |  |
Real Estate Properties [Line Items] |  |
Number of properties | property | 2 |
Number of buildings | property | 2 |
Development projects |  |
Real Estate Properties [Line Items] |  |
Number of properties | 4 |
Number of buildings | 4 |
Development projects | San Diego and South San Francisco, California |  |
Real Estate Properties [Line Items] |  |
Rentable square feet (unaudited) | ft² | 1,109,509 |
Development projects | Hollywood, California |  |
Real Estate Properties [Line Items] |  |
Number of units | residential_unit | 193 |
Development project in the tenant improvement phase | Washington |  |
Real Estate Properties [Line Items] |  |
Number of properties | 1 |
Number of buildings | 1 |
Development project in the tenant improvement phase | TEXAS |  |
Real Estate Properties [Line Items] |  |
Number of properties | 1 |
Number of buildings | 1 |
Future development project | Washington |  |
Real Estate Properties [Line Items] |  |
Number of properties | 1 |
Number of buildings | 1 |
Development properties |  |
Real Estate Properties [Line Items] |  |
Number of property partnerships | property_partnership | 3 |
Development properties | 101 First LLC and 303 Second LLC |  |
Real Estate Properties [Line Items] |  |
Number of property partnerships | property_partnership | 2 |
Building | San Diego and South San Francisco, California |  |
Real Estate Properties [Line Items] |  |
Number of buildings | property | 6 |
Development sites |  |
Real Estate Properties [Line Items] |  |
Number of future development sites | 6 |
Area of undeveloped land | a | 59 |
Stabilized Office Properties |  |
Real Estate Properties [Line Items] |  |
Number of buildings | property | 120 |
Rentable square feet (unaudited) | ft² | 15,456,528 |
Stabilized Office Properties | Washington |  |
Real Estate Properties [Line Items] |  |
Number of properties | property | 9 |
Number of buildings | property | 9 |
Properties and development projects |  |
Real Estate Properties [Line Items] |  |
Property ownership percentage | 100.00% |
Office Properties Owned by Consolidated Property Partnerships |  |
Real Estate Properties [Line Items] |  |
Number of properties | property | 4 |
Number of buildings | property | 4 |

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