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Gain on Sales of Investment Properties	3 Months Ended
Gain on Sales of Investment Properties	Mar. 31, 2013
Gain on Sales of Investment Properties
Gain on Sales of Investment Properties	13. Gain on Sales of Investment Properties During the first three months of 2013, we sold 17 investment properties for $60.0 million, which resulted in a gain of $38.6 million. In comparison, during the first three months of 2012, we sold five investment properties for $3.6 million, which resulted in a gain of $611,000. The results of operations for these properties have been reclassified as discontinued operations.