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Organization (Details)
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Mar. 31, 2015
Property
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| Debt in default of payment terms | Northern Virginia | Wholly owned subsidiary |
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| Investments in real estate |
|
| Number of real estate properties |
2 |
| Operating office properties |
|
| Investments in real estate |
|
| Number of real estate properties |
178 |
| Square footage of real estate properties (in square feet) |
17,700,000 |
| Office properties under, or contractually committed for, construction or approved for redevelopment |
|
| Investments in real estate |
|
| Number of real estate properties |
12 |
| Square footage of real estate properties (in square feet) |
1,400,000 |
| Partially operational properties |
|
| Investments in real estate |
|
| Number of real estate properties |
1 |
| Land controlled for future development |
|
| Investments in real estate |
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| Square footage of real estate properties (in square feet) |
1,402 |
| Developable square feet |
17,600,000 |
| Partially operational, wholesale data center |
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| Investments in real estate |
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| The expected stabilization critical load after completion of development (in megawatts) |
19.25 |