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Organization and Basis of Presentation (Tables)
9 Months Ended
Sep. 30, 2011
Organization, Consolidation and Presentation of Financial Statements [Abstract] 
Summary of stabilized portfolio of operating properties
The following table of office buildings (the "Office Properties") and industrial buildings (the "Industrial Properties") summarizes our stabilized portfolio of operating properties as of September 30, 2011. As of September 30, 2011, all of our properties and all of our business is currently conducted in the state of California with the exception of the operation of six office properties located in the state of Washington.
 
 
Number of
Buildings
 
Rentable
Square Feet
 
Number of
Tenants
 
Percentage Occupied
Office Properties(1)
105

 
11,574,244

 
422

 
90.6
%
Industrial Properties
40

 
3,605,407

 
64

 
100.0
%
Total Stabilized Portfolio
145

 
15,179,651

 
486

 
92.8
%
________________________
(1) Includes nine office properties acquired during the nine months ended September 30, 2011 for a total amount of $516.3 million (see Note 2 for additional information).