XML 52 R37.htm IDEA: XBRL DOCUMENT
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Organization of The Parent Company and The Operating Partnership (Textual) (Details) | Jun. 30, 2016 | Jun. 30, 2016 property | Jun. 30, 2016 ft² | Jun. 30, 2016 Real_Estate_Investment | Jun. 30, 2016 a | Jun. 30, 2016 Building | Jun. 30, 2016 Apartment_unit | Feb. 04, 2016 property
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Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Number of Properties | property |  | 120 |  |  |  |  |  |
Office Properties [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Number of Properties | property |  | 102 |  |  |  |  |  |
Rentable Square Feet |  |  | 4,984,700 |  |  |  |  |
Mixed Use Properties [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Number of Properties | property |  | 9 |  |  |  |  |  |
Retail Properties [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Number of Properties | property |  | 1 |  |  |  |  |  |
Core Properties [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Number of Properties | property |  | 112 |  |  |  |  |  |
Development Property [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Number of Properties | property |  | 4 |  |  |  |  |  |
Redevelopment Properties [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Number of Properties | property |  | 2 |  |  |  |  |  |
One Real Estate Ventures [Member] | Office Properties [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Net Rentable Square Feet |  |  | 172,286 |  |  |  |  |
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment |  |  |  | 1 |  |  |  |
Assets Held-for-sale [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Number of Properties | property |  | 2 |  |  |  |  |  |
Unconsolidated Real Estate Ventures [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment |  |  |  | 16 |  |  |  |
Unconsolidated Real Estate Ventures [Member] | Eight Real Estate Ventures [Member] | Office Properties [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Number of Properties | Building |  |  |  |  |  | 73 |  |
Unconsolidated Real Estate Ventures [Member] | Eight Real Estate Ventures [Member] | Office And Industrial Buildings [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment |  |  |  | 8 |  |  |  |
Rentable Square Feet |  |  | 7,900,000 |  |  |  |  |
Unconsolidated Real Estate Ventures [Member] | Two Real Estate Ventures [Member] | Undeveloped Land [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment |  |  |  | 2 |  |  |  |
Acreage of land | a |  |  |  |  | 4.3 |  |  |
Unconsolidated Real Estate Ventures [Member] | Three Real Estate Ventures [Member] | Under Active Development Land [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment |  |  |  | 3 |  |  |  |
Acreage of land | a |  |  |  |  | 2.2 |  |  |
Unconsolidated Real Estate Ventures [Member] | One Real Estate Ventures [Member] | Residential Tower [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment |  |  |  | 1 |  |  |  |
Number of Property units |  | 345 |  |  |  |  | 345 |
Unconsolidated Real Estate Ventures [Member] | One Other Real Estate Ventures [Member] | Apartment Complex [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment |  |  |  | 1 |  |  |  |
Number of Property units |  | 398 |  |  |  |  | 398 |
1000 Chesterbrook [Member] | One Real Estate Ventures [Member] | Office Properties [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Net Rentable Square Feet |  |  | 172,286 |  |  |  |  |
Number of Unconsolidated Investments in Real Estate Ventures | Real_Estate_Investment |  |  |  | 1 |  |  |  |
Equity method investment percentage | 50.00% |  |  |  |  |  |  |
MAP Venture [Member] | Industrial Properties [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Number of Properties | property |  | 6 |  |  |  |  |  | 20
Parent Company [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Ownership in the Operating Partnership | 99.10% |  |  |  |  |  |  |
Net Rentable Square Feet |  |  | 18,100,000 |  |  |  |  |
Area Owned by Company of Undeveloped Parcels of Land | a |  |  |  |  | 285 |  |  |
Area of Additional Undeveloped Parcels of Land With Option to Purchase | a |  |  |  |  | 50 |  |  |
Total Potential Development Capacity |  |  | 6,300,000 |  |  |  |  |
Wholly-owned Management Company Subsidiaries [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Net Rentable Square Feet |  |  | 29,200,000 |  |  |  |  |
Wholly-owned Management Company Subsidiaries [Member] | Partially Owned Properties [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Net Rentable Square Feet |  |  | 11,200,000 |  |  |  |  |
Wholly-owned Management Company Subsidiaries [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Net Rentable Square Feet |  |  | 18,000,000 |  |  |  |  |
Wholly-owned Management Company Subsidiaries [Member] | Office and Industrial Properties [Member] | Partially Owned Properties [Member] |  |  |  |  |  |  |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |  |  |  |  |  |  |
Net Rentable Square Feet |  |  | 11,200,000 |  |  |  |  |

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