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Organization of The Parent Company and The Operating Partnership (Textual) (Details) | Mar. 31, 2016 ft² a property Real_Estate_Investments real_estate_venture Building Apartment_unit | Feb. 04, 2016 property
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Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 121 |
Office Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 106 |
Rentable Square Feet | ft² | 4,787,475 |
Industrial Properties [Member] | MAP Venture [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 6 | 20
Nine Real Estate Ventures [Member] | Office Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | Building | 88 |
Number of unconsolidated investments in Real Estate Ventures | real_estate_venture | 9 |
Rentable Square Feet | ft² | 8,100,000 |
Mixed Use Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 9 |
Retail Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 1 |
Core Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 116 |
Development Property [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 3 |
Redevelopment Property [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 1 |
Re-entitlement Property [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 1 |
Undeveloped Land [Member] | Two 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_venture | 2 |
Acreage of land | a | 4.3 |
Under Active Development Land [Member] | Three 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_venture | 3 |
Acreage of land | a | 2.2 |
Residential Tower [Member] | One 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_venture | 1 |
Number of Property units | Apartment_unit | 345 |
Apartment Complex [Member] | One Other 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_venture | 1 |
Number of Property units | Apartment_unit | 398 |
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 | ft² | 18,200,000 |
Area Owned by Company of Undeveloped Parcels of Land | a | 292 |
Area of Additional Undeveloped Parcels of Land With Option to Purchase | a | 50 |
Total Potential Development Capacity | ft² | 6,400,000 |
Unconsolidated Real Estate Ventures [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Unconsolidated Real Estate Ventures | Real_Estate_Investments | 16 |
Unconsolidated Real Estate Ventures [Member] | Nine Real Estate Ventures [Member] | Office Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of unconsolidated investments in Real Estate Ventures | Real_Estate_Investments | 9 |
Rentable Square Feet | ft² | 8,100,000 |
Unconsolidated Real Estate Ventures [Member] | Undeveloped Land [Member] | Two 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_Investments | 2 |
Acreage of land | a | 4.3 |
Unconsolidated Real Estate Ventures [Member] | Under Active Development Land [Member] | Three 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_Investments | 3 |
Acreage of land | a | 2.2 |
Unconsolidated Real Estate Ventures [Member] | Residential Tower [Member] | One 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_Investments | 1 |
Number of Property units | 345 |
Unconsolidated Real Estate Ventures [Member] | Apartment Complex [Member] | One Other 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_Investments | 1 |
Number of Property units | 398 |
Wholly-owned Management Company Subsidiaries [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Net Rentable Square Feet | ft² | 29,300,000 |
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 | ft² | 11,100,000 |
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 | ft² | 18,200,000 |
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 | ft² | 11,100,000 |

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