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Organization and Ownership (Tables)
12 Months Ended
Dec. 31, 2021
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 December 31, 2021:

Number of
Buildings
Rentable
Square Feet (unaudited)
Number of
Tenants
Percentage 
Occupied
(unaudited)(1)
Percentage Leased
(unaudited)
Stabilized Office Properties (2)
120 15,456,528 422 91.9 %93.9 %
_______________________
(1)Represents economic occupancy.
(2)Includes stabilized life science and retail space.

Number of ProjectsNumber of Units2021 Average Occupancy
(unaudited)
Stabilized Residential Properties31,001 78.0 %
We did not have any properties held for sale at December 31, 2021. As of December 31, 2021, the following properties were excluded from our stabilized portfolio.
Number of
Properties/Projects
Estimated Rentable
Square Feet (1)
(unaudited)
In-process development projects - tenant improvement (2)
31,604,000 
In-process development projects - under construction 2946,000 
In-process redevelopment projects - under construction (3)
196,000 
____________________
(1)Estimated rentable square feet upon completion.
(2)Includes the development property acquired in Austin, Texas during the year ended December 31, 2021. Refer to Note 3 “Acquisitions” for additional information.
(3)Excludes the two committed redevelopment projects at December 31, 2021, which are included in the stabilized portfolio since construction has not commenced.