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Dispositions of Properties (Details) $ in Thousands |  |  |  |  |  | 3 Months Ended | 9 Months Ended
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Oct. 22, 2021 USD ($) | Sep. 23, 2021 USD ($) property | Aug. 31, 2021 USD ($) | Jun. 29, 2021 USD ($) | May 27, 2021 USD ($) property | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Dispositions of properties |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  |  |  | $ 8,632 |  | $ 29,258 |
Office Properties in Atlanta, Georgia |  |  |  |  |  |  |  |  |
Dispositions of properties |  |  |  |  |  |  |  |  |
Number of properties sold | property |  |  |  |  | 3 |  |  |  |
Gain (loss) on sale of property |  |  |  |  | $ 22,800 |  |  |  |
Sale price |  |  |  |  | $ 219,500 |  |  |  |
Office Properties in Atlanta, Georgia | Subsequent event |  |  |  |  |  |  |  |  |
Dispositions of properties |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property | $ 86,800 |  |  |  |  |  |  |  |
Sale price | $ 223,900 |  |  |  |  |  |  |  |
Office Property in Dulles, Virginia |  |  |  |  |  |  |  |  |
Dispositions of properties |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  | $ (2,100) |  |  |  |  |
Sale price |  |  |  | $ 17,300 |  |  |  |  |
Office property in Indianapolis, Indiana |  |  |  |  |  |  |  |  |
Dispositions of properties |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  | $ (1,700) |  |  |  |  |  |
Sale price |  |  | $ 35,000 |  |  |  |  |  |
Office properties in Chesterfield, MO |  |  |  |  |  |  |  |  |
Dispositions of properties |  |  |  |  |  |  |  |  |
Number of properties sold | property |  | 2 |  |  |  |  |  |  |
Gain (loss) on sale of property |  | $ 10,300 |  |  |  |  |  |  |
Sale price |  | $ 67,000 |  |  |  |  |  |  |
Disposal group disposed of by sale, not classified as discontinued operations |  |  |  |  |  |  |  |  |
Operating results for discontinued operations: |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  | 2,820 | $ 10,759 | 20,813 | $ 31,365
Rental operating expenses |  |  |  |  |  | (801) | (3,465) | (6,292) | (9,778)
Real estate taxes and insurance |  |  |  |  |  | 136 | (1,632) | (2,814) | (4,980)
Depreciation and amortization |  |  |  |  |  | (769) | (4,050) | (6,047) | (12,181)
Net income (loss) from discontinued operations |  |  |  |  |  | $ 1,386 | $ 1,612 | $ 5,660 | $ 4,426

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