The most expensive apartment sold in New York City last year went for $71.3 million—but this isn't last year, and 2015's most expensive home is officially a whopping $91.5 million. (And it doesn't even have an occupant! Madness!) With the help of our friends at PropertyShark, we're taking a look at the 20 biggest home sales (including apartments and townhouses) in New York City this year. They include seven (yes, seven) apartments at One57, a townhouse that doesn't even exist, and a fancy co-op that's since returned to the market. Welcome to New York real estate in 2015.