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Organization, Ownership, and Basis of Presentation (Tables)
 9 Months Ended
Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Real Estate Properties
Our stabilized portfolio of operating properties was comprised of the following properties at September 30, 2025:
Number of
Buildings		Rentable
Square Feet		Number of
Tenants
Percentage 
Occupied (1)
Stabilized Office Properties (2)
121 16,811,767 483 81.0 %
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(1)Represents economic occupancy for space where we have achieved revenue recognition for the associated lease agreements.
(2)Includes stabilized life science and retail space.
Number of
Properties
Number of
Units		2025 Average Occupancy
Stabilized Residential Properties3 1,001 94.1 %

As of September 30, 2025, the following properties were excluded from our stabilized portfolio:

Number of Projects
Estimated Rentable
Square Feet (1)
In-process development project - tenant improvement1871,738
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(1)Represents estimated rentable square feet upon completion.
Schedule of Consolidated Property Partnership Ownership Percentage
Consolidated Property PartnershipProperty Address
Ownership Interest (1)
100 First Street Member, LLC100 1st Street, San Francisco, CA 9410556%
303 Second Street Member, LLC303 2nd Street, San Francisco, CA 9410756%
Redwood City Partners, LLC900 Jefferson Avenue, Redwood City, CA 9406393%
900 Middlefield Road, Redwood City, CA 94063
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(1)The remaining interests in all three property partnerships were owned by unrelated third parties.