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Organization, Ownership and Basis of Presentation (Tables)
 9 Months Ended
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of real estate properties
Our stabilized portfolio of operating properties was comprised of the following properties at September 30, 2021:
Number of
Buildings		Rentable
Square Feet		Number of
Tenants
Percentage 
Occupied (1)
Percentage Leased
Stabilized Office Properties (2)
121 15,199,178 430 91.5 %93.9 %
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(1)Represents physical and economic occupancy.
(2)Includes stabilized life science and retail space.

Number of
Projects		Number of
Units		2021 Average Occupancy
Stabilized Residential Properties3 1,001 74.0 %
As of September 30, 2021, the following properties were excluded from our stabilized portfolio. We did not have any active in-process redevelopment properties or properties held for sale at September 30, 2021.
Number of
Properties/Projects
Estimated Rentable
Square Feet (1)
In-process development projects - tenant improvement (2)
42,025,000 
In-process development projects - under construction2946,000 
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(1)Estimated rentable square feet upon completion.
(2)Includes the development property acquired in Austin, Texas during the nine months ended September 30, 2021. Refer to Note 2 “Acquisitions” for additional information.