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Organization, Ownership and Basis of Presentation (Tables)
 3 Months Ended
Mar. 31, 2022
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 March 31, 2022:
Number of
Buildings		Rentable
Square Feet		Number of
Tenants
Percentage 
Occupied (1)
Percentage Leased
Stabilized Office Properties (2)
118 15,221,912 415 91.3 %93.1 %
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(1)Represents economic occupancy.
(2)Includes stabilized life science and retail space.

Number of
Projects		Number of
Units		2022 Average Occupancy
Stabilized Residential Properties3 1,001 93.7 %
As of March 31, 2022, the following properties were excluded from our stabilized portfolio. We did not have any properties held for sale at March 31, 2022.
Number of
Properties/Projects
Estimated Rentable
Square Feet (1)
In-process development projects - tenant improvement31,604,000 
In-process development projects - under construction2946,000 
In-process redevelopment projects - under construction3330,000 
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(1)Estimated rentable square feet upon completion.