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Discontinued Operations Discontinued Operations (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Revenue: |  |  |  |  |
Rents | $ 116,334,000 |  | $ 109,713,000 | $ 231,201,000 | $ 218,704,000
Tenant reimbursements | 19,565,000 |  | 18,229,000 | 39,916,000 | 36,885,000
Termination fees | 410,000 |  | 101,000 | 906,000 | 1,591,000
Other Real Estate Revenue | 1,457,000 |  | 888,000 | 2,330,000 | 2,399,000
Total revenue | 140,919,000 |  | 131,803,000 | 280,742,000 | 265,593,000
Expenses: |  |  |  |  |
Property operating expenses | 39,490,000 |  | 36,363,000 | 78,908,000 | 74,223,000
Real estate taxes | 14,215,000 |  | 13,508,000 | 28,552,000 | 26,977,000
Depreciation and amortization | 49,300,000 |  | 47,476,000 | 98,846,000 | 95,350,000
Total operating expenses | 111,703,000 |  | 104,690,000 | 222,980,000 | 211,193,000
Interest income | 122,000 |  | 1,838,000 | 180,000 | 2,320,000
Income from discontinued operations before gain on sale of interests in real estate | 8,000 |  | 2,535,000 | 780,000 | 5,275,000
Net gain on disposition of discontinued operations | (2,260,000) | [1] | 10,177,000 | 3,044,000 | 24,845,000
Income from discontinued operations | (2,252,000) |  | 12,712,000 | 3,824,000 | 30,120,000
Discontinued Operations, Disposal Closing Costs | 1,100,000 | [1] |  |  |
Discontinued Operations [Member] |  |  |  |  |
Revenue: |  |  |  |  |
Rents | 626,000 |  | 7,322,000 | 4,129,000 | 16,680,000
Tenant reimbursements | 2,000 |  | 719,000 | 331,000 | 1,486,000
Termination fees |  |  | 0 |  | 7,000
Other Real Estate Revenue | 9,000 |  | 164,000 | 123,000 | 188,000
Total revenue | 637,000 |  | 8,205,000 | 4,583,000 | 18,361,000
Expenses: |  |  |  |  |
Property operating expenses | 274,000 |  | 2,137,000 | 1,586,000 | 4,841,000
Real estate taxes | 79,000 |  | 843,000 | 504,000 | 1,977,000
Depreciation and amortization | 278,000 |  | 2,695,000 | 1,715,000 | 6,274,000
Total operating expenses | 631,000 |  | 5,675,000 | 3,805,000 | 13,092,000
Interest income | 2,000 |  | 5,000 | 2,000 | 6,000
Income from discontinued operations before gain on sale of interests in real estate | 8,000 |  | 2,535,000 | 780,000 | 5,275,000
Net gain on disposition of discontinued operations |  |  | 10,177,000 | 3,044,000 | 24,845,000
Income from discontinued operations | $ (2,252,000) |  | $ 12,712,000 | $ 3,824,000 | $ 30,120,000
[1] | The loss of $(2.3) million for the second quarter of 2013 includes $1.1 million of closing costs incurred to sell the properties.

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