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Investments in Real Estate and Real Estate Under Construction (Tables) | 3 Months Ended
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Mar. 31, 2013
Investments in Real Estate and Real Estate Under Construction [Abstract] |
Schedule of Acquired Properties [Table Text Block] | The Company, through property owner subsidiaries, completed the following acquisition and build-to-suit transactions during the three months ended March 31, 2013:
Property Type | Location | Acquisition/Completion Date | Initial Cost Basis | Lease Expiration | Land and Land Estate |  | Building and Improvements |  | Lease in-place Value Intangible
Industrial | Long Island City, NY | February 2013 | $ | 41,872 |  | 03/2028 | $ | — |  |  | $ | 41,872 |  |  | $ | — |
Industrial | Houston, TX | March 2013 | $ | 81,400 |  | 03/2038 | $ | 15,055 |  |  | $ | 57,949 |  |  | $ | 8,396 |
|  |  | $ | 123,272 |  |  | $ | 15,055 |  |  | $ | 99,821 |  |  | $ | 8,396 |
Schedule of Acquisition Development and Construction Arrangements Outstanding [Table Text Block] | As of March 31, 2013, the Company had the following development arrangements outstanding:
Location | Property Type | Square Feet |  | Expected Maximum Commitment/Contribution ($ millions) |  | Lease Term (Years) |  | Estimated Completion Date
Denver, CO | Office | 167,000 |  |  | $ | 39.0 |  |  | 15 |  | 2Q 13
Tuscaloosa, AL | Retail | 42,000 |  |  | $ | 8.8 |  |  | 15 |  | 3Q 13
Rantoul, IL | Industrial | 813,000 |  |  | $ | 42.6 |  |  | 20 |  | 4Q 13
Bingen, WA(1) | Industrial | 124,000 |  |  | $ | 20.8 |  |  | 10-20 |  | 2Q 14
|  | 1,146,000 |  |  | $ | 111.2 |  |  |  |  |
(1) Commitment may be terminated by the tenant prior to the commencement of construction.
Business Acquisition, Pro Forma Information [Table Text Block] | The information presented below is not necessarily indicative of what the actual results of operations would have been had the transaction been completed on January 1, 2012, nor does it purport to represent the Company's future operations:
|  | Three Months Ended March 31, 2012
Gross revenues |  | $ | 89,674 |
Net loss attributable to Lexington Realty Trust shareholders |  | $ | (4,844 | )
Net loss attributable to common shareholders |  | $ | (10,642 | )
Net loss per common share - basic and diluted |  | $ | (0.07 | )

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