Lease-Up Properties, Maximum Stabilized Occupancy, Duration

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- Definition

Lease-Up Properties, Maximum Stabilized Occupancy, Percentage

+ References

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- Definition

Number of Buildings

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- Definition

Number of Development Projects Added During the Period

+ References

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- Definition

Number of Future Development Sites

+ References

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- Definition

Number of Property Partnerships

+ References

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- Definition

Property Ownership Percentage

+ References

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- Definition

Area of land held.

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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

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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- Definition

Net rentable area for properties owned.

+ References

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

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- Definition

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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Organization and Ownership - Narrative (Details)	12 Months Ended
Organization and Ownership - Narrative (Details)	Dec. 31, 2023 a ft² development_site property development_project property_partnership building	Dec. 31, 2022
Real Estate Properties [Line Items]
Lease-up properties occupancy percentage	95.00%
Lease-up properties occupancy duration	1 year
Rentable square feet \| ft²	17,044,128
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	121
Rentable square feet \| ft²	17,044,128
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
Development Project - Stabilized Office Property \| San Diego, CA and Austin, Texas
Real Estate Properties [Line Items]
Number of development projects added during the period \| development_project	2
Number of buildings \| building	2
Rentable square feet \| ft²	829,591