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Organization and Ownership - Narrative (Details) | 12 Months Ended
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Dec. 31, 2024 a ft² property development_site building property_partnership | Dec. 31, 2023
Real Estate Properties [Line Items] |  |
Lease-up properties occupancy percentage | 95.00% |
Lease-up properties occupancy duration | 1 year |
Rentable square feet | ft² | 17,142,721 |
100 First LLC and 303 Second LLC |  |
Real Estate Properties [Line Items] |  |
Company owned general partnership interest | 56.00% |
Redwood LLC |  |
Real Estate Properties [Line Items] |  |
Company owned general partnership interest | 93.00% |
Operating Partnership |  |
Real Estate Properties [Line Items] |  |
Ownership interest (percent) | 99.00% | 99.00%
Operating Partnership | Non-Affiliated Investors and Certain Executive Officer and Directors |  |
Real Estate Properties [Line Items] |  |
Ownership interest (percent) | 1.00% | 1.00%
San Francisco, California |  |
Real Estate Properties [Line Items] |  |
Number of properties | 1 |
Redwood City, California | Redwood LLC |  |
Real Estate Properties [Line Items] |  |
Number of properties | 2 |
Future Development Site |  |
Real Estate Properties [Line Items] |  |
Number of future development sites | development_site | 8 |
Area of undeveloped land | a | 64 |
Stabilized Office Properties |  |
Real Estate Properties [Line Items] |  |
Number of buildings | building | 123 |
Rentable square feet | ft² | 17,142,721 |
Stabilized Office Properties | Washington |  |
Real Estate Properties [Line Items] |  |
Number of properties | 10 |
Stabilized Office Properties | Texas |  |
Real Estate Properties [Line Items] |  |
Number of properties | 1 |
Future development project | Washington |  |
Real Estate Properties [Line Items] |  |
Number of properties | development_site | 1 |
Future development project | Texas |  |
Real Estate Properties [Line Items] |  |
Number of properties | development_site | 1 |
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 | 4 |
Consolidated property partnerships |  |
Real Estate Properties [Line Items] |  |
Number of property partnerships | property_partnership | 3 |
Consolidated Property Partnerships Owning Office Properties Through REITs | 100 First LLC and 303 Second LLC |  |
Real Estate Properties [Line Items] |  |
Number of property partnerships | property_partnership | 2 |

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- Definition Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482987/272-10-50-3 + Details
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