Nearly 800 structures were converted to apartment buildings in the 2010s, the highest number in the past seven decades, according to research by data provider Yardi Matrix. Chicago tops the list of U.S. cities with the most adaptive-use apartment buildings, whereas New York City is home to the most converted apartment units in total.

Idle factories have historically been the most popular buildings for conversion into rentals, but office-to-apartment conversions were the most common type in the 2010s.

+INFO: Urbanland