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Organization and Ownership (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2020:

Number of
Buildings		Rentable
Square Feet (unaudited)		Number of
Tenants
Percentage 
Occupied
(unaudited) (1)
Percentage Leased
(unaudited)
Stabilized Office Properties (2)
117 14,620,166 447 91.2 %94.3 %
_______________________
(1)Represents physical and economic occupancy.
(2)Includes stabilized life science and retail space.

Number of ProjectsNumber of Units2020 Average Occupancy
(unaudited)
Stabilized Residential Properties2808 72.0 %
As of December 31, 2020, the following properties were excluded from our stabilized portfolio. We did not have any redevelopment properties or properties held for sale at December 31, 2020.
Number of
Properties/Projects
Estimated Rentable
Square Feet (1)
(unaudited)
In-process development projects - tenant improvement31,080,000 
In-process development projects - under construction (2)
3856,000 
____________________
(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.