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Organization, Ownership and Basis of Presentation (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2021:
Number of
Buildings		Rentable
Square Feet		Number of
Tenants
Percentage 
Occupied (1)
Percentage Leased
Stabilized Office Properties (2)
117 14,049,585 436 91.5 %93.3 %
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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 Properties2 808 69.1 %
As of March 31, 2021, the following properties were excluded from our stabilized portfolio. We did not have any redevelopment properties or properties held for sale at March 31, 2021.
Number of
Properties/Projects
Estimated Rentable
Square Feet (1)
In-process development projects - tenant improvement31,576,000 
In-process development projects - under construction (2)
2200,000 
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(1)Estimated rentable square feet upon completion.
(2)In addition to the estimated office and life science rentable square feet noted above, development projects under construction also include 193 residential units.