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Gain on Sales of Real Estate	12 Months Ended
Gain on Sales of Real Estate	Dec. 31, 2017
Gain on Sales of Real Estate
Gain on Sales of Real Estate	13. Gain on Sales of Real Estate During 2017, we sold 59 properties for $167.0 million, which resulted in a gain of $40.9 million. During 2016, we sold 77 properties for $90.5 million, which resulted in a gain of $22.0 million. Additionally, during 2016 we sold our former corporate headquarters building for $8.6 million. During 2015, we sold 38 properties for $65.8 million, which resulted in a gain of $22.2 million. These property sales do not represent a strategic shift that will have a major effect on our operations and financial results, and therefore do not require presentation as discontinued operations.