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Notes Payable (Details Textual) (Details) (USD $) | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2013 Terminus One Hundred LLC [Member] | Feb. 28, 2013 Terminus One Hundred LLC [Member] | Sep. 06, 2013 Post Oak Central [Member] sqft | Sep. 06, 2013 Promenade D Atlanta GA [Member] sqft | Sep. 06, 2013 Post Oak Central Mortgage Note [Member] Post Oak Central [Member] | Sep. 06, 2013 Promenade Atlanta Mortgage Note [Member] Promenade D Atlanta GA [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Notes Payable [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 82,000,000 |  |  |  | $ 188,800,000.0 | $ 114,000,000.0
Area of Real Estate Property |  |  |  |  | 1,300,000 | 780,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 4.26% | 4.27%
Ownership Percentage of Partner in Joint Venture |  |  |  | 50.00% |  |  |  |
Debt Instrument, Fair Value Disclosure | $ 746,400,000 | $ 456,000,000 |  |  |  |  |  |

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