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Organization of The Parent Company and The Operating Partnership (Details) | Jun. 30, 2011
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Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Ownership in the Operating Partnership | 93.20%
Office Properties [Member] |
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Total number of properties owned | 209
Industrial facilities [Member] |
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Total number of properties owned | 20
Mixed-use properties [Member] |
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Total number of properties owned | 6
Mixed-use properties [Member] | Unconsolidated real estate ventures [Member] |
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Net rentable square feet | 25,700,000
Parent Company [Member] |
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Net rentable square feet | 25,700,000
Unconsolidated real estate ventures [Member] |
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Number of unconsolidated real estate ventures | 16
Net rentable square feet | 6,100,000
Wholly-owned management company subsidiaries [Member] |
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Net rentable square feet | 33,700,000
Third Parties and Unconsolidated Real Estate Ventures [Member] |
Organization of The Parent Company and The Operating Partnership (Textuals) [Abstract] |
Net rentable square feet | 8,000,000

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- Definition The consolidating entity's interest in net assets of the subsidiary, expressed as a percentage. + Details
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