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Organization of the Parent Company and The Operating Partnership (Details) ft² in Millions | Jun. 30, 2015 a ft² property real_estate_investment | Jun. 30, 2014 ft²
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Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 9 |
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 | 25.2 |
Area Owned by Company of Undeveloped Parcels Of Land | a | 430 |
Area Of Additional Undeveloped Parcels Of Land With Option to Purchase | a | 63 |
Total Potential Development Capacity | ft² | 7.2 |
Unconsolidated Real Estate Ventures [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Net Rentable Square Feet | ft² | 5.6 | 5.9
Number of Unconsolidated Real Estate Ventures | real_estate_investment | 18 |
Wholly-owned Management Company Subsidiaries [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Net Rentable Square Feet | ft² | 33.0 |
Third Parties and Real Estate Ventures [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Net Rentable Square Feet | ft² | 7.8 |
Total Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 199 |
Office Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 167 |
Industrial Facilities [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 20 |
Mixed Use Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 5 |
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 | 193 |
Development Property [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Properties | 4 |
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 |
Wholly Owned Properties [Member] | Parent Company [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Net Rentable Square Feet | ft² | 25.2 |

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