v3.3.1.900
Organization and Ownership (Tables)
12 Months Ended
Dec. 31, 2015
Real Estate Properties [Line Items]  
Schedule of Real Estate Properties [Table Text Block]
Our stabilized portfolio of operating properties was comprised of the following office properties at December 31, 2015:

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

 
13,032,406

 
517

 
94.8
%
As of December 31, 2015, the following properties were excluded from our stabilized portfolio:

 
Number of
Properties/Projects
 
Estimated Rentable
Square Feet (unaudited) (1)
Properties held for sale (2)
4
 
465,812

Development projects in lease-up"
1
 
73,000

Development projects under construction
5
 
1,910,000

_______________
(1)
Estimated rentable square feet upon completion.