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Acquisitions, Dispositions, Impairment, and Discontinued Operations | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Acquisitions, Dispositions, Impairment, and Discontinued Operations [Text Block] | 8. Acquisitions, Dispositions, and Discontinued Operations Asset Acquisition of Operating Properties. In September 2018, we acquired one operating property comprised of 299 apartment homes located in Orlando, Florida, for approximately $89.8 million. In February 2018, we acquired one operating property comprised of 333 apartment homes located in Orlando, Florida, for approximately $81.4 million. In January 2018, we acquired one operating property comprised of 358 apartment homes located in St. Petersburg, Florida, for approximately $126.9 million. In June 2017, we acquired one operating property comprised of 250 apartment homes, located in Atlanta, Georgia, for approximately $58.3 million. There were no asset acquisitions of operating properties for the year ended December 31, 2016. Acquisitions of Land. In April 2018, we acquired approximately 1.8 acres of land in Orlando, Florida for approximately $11.4 million for the development of a community with 360 wholly-owned apartment homes which started construction during the quarter ended June 30, 2018. During the year ended December 31, 2017, we acquired approximately 8.2 acres of land in San Diego, California for approximately $20.0 million. During the year ended December 31, 2016, we acquired an aggregate of approximately 4.6 acres of land located in Denver, Colorado and Charlotte, North Carolina for approximately $19.9 million. Land Holding Dispositions. In September 2018, we sold approximately 14.1 acres of land adjacent to two development properties in Phoenix, Arizona for approximately $11.5 million. During the year ended December 31, 2017, we did not sell any land. During the year ended December 31, 2016, we sold approximately 6.3 acres of land adjacent to an operating property in Tampa, Florida for approximately $2.2 million and recognized a gain of approximately $0.4 million. Sale of Operating Properties. We did not sell any operating properties during the year ended December 31, 2018. During the year ended December 31, 2017, we sold one operating property, comprised of 1,005 apartment homes, located in Corpus Christi, Texas for approximately $78.4 million and recognized a gain of approximately $43.2 million. During the year ended December 31, 2016, we sold one dual-phased property and six other operating properties comprised of an aggregate of 3,184 apartment homes with an average age of 24 years, located in Landover and Frederick, Maryland; Fullerton, California; and Tampa, Altamonte Springs, and St. Petersburg, Florida for an aggregate of approximately $523.4 million, and recognized a gain of approximately $294.9 million. Discontinued Operations. During the years ended December 31, 2018 and 2017, we did not have any discontinued operations. During the year ended December 31, 2016, we had discontinued operations related to the sale in April 2016 of 15 operating properties, comprised of an aggregate of 4,918 apartment homes, with an average age of 23 years, a retail center and approximately 19.6 acres of land, all located in Las Vegas, Nevada, to an unaffiliated third party for an aggregate of approximately $630.0 million and recognized a gain of approximately $375.2 million, net of closing costs. The following is a summary of income from discontinued operations for the year ended December 31, 2016 relating to the 15 operating properties and the retail center sold in April 2016:
|  | Year Ended December 31,
(in thousands) |  | 2016
Property revenues |  | $ | 19,184 |
Property expenses |  | (6,898 | )
|  | $ | 12,286 |
Property management expense |  | (242 | )
Depreciation and amortization |  | (4,327 | )
Income tax expense |  | (112 | )
Income from discontinued operations |  | $ | 7,605 |
Gain on sale of discontinued operations, net of tax |  | $ | 375,237 |

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