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Organization and Basis of Presentation (Tables)
 9 Months Ended
Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of real estate properties
Our stabilized portfolio of operating properties was comprised of the following office properties at September 30, 2015:

 
Number of
Buildings
 
Rentable
Square Feet
 
Number of
Tenants
 
Percentage 
Occupied
Stabilized Office Properties
101

 
13,050,947

 
509

 
95.6
%


As of September 30, 2015, the following properties were excluded from our stabilized portfolio:

 
Number of
Properties/Projects
 
Estimated Rentable
Square Feet
Development projects in “lease-up”
1
 
108,539

Development projects under construction (1)

7
 
2,322,000

________________________
(1)
Estimated rentable square feet upon completion.