Organization and Ownership (Tables)

12 Months Ended

Dec. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of real estate properties

As of December 31, 2019, the following properties were excluded from our stabilized portfolio. We did not have any redevelopment properties or properties held for sale at December 31, 2019.

	Number of Properties/Projects	Estimated Rentable Square Feet (1) / Units (unaudited)
In-process development projects - tenant improvement (2)	2	846,000
In-process development projects - under construction (3)	6	2,291,000
Completed residential development project (4)	1	237 units

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(1) Estimated rentable square feet upon completion.

(2) Includes 96,000 square feet of retail space.

(3) In addition to the estimated office and life science rentable square feet noted above, development projects under construction also include 564 residential units.

(4) Represents recently completed residential units not yet stabilized.

Our stabilized portfolio of operating properties was comprised of the following properties at December 31, 2019:

	Number of Buildings	Rentable Square Feet (unaudited)	Number of Tenants	Percentage  Occupied (unaudited)		Percentage Leased (unaudited)
Stabilized Office Properties	112	13,475,795	451	94.6	%	97.0	%

	Number of Buildings	Number of Units	2019 Average Occupancy (unaudited)
Stabilized Residential Property	1	200	82.4	%