It's unclear exactly what has changed since 2011, when this 3BR/3.5BA, 2,975-square-foot apartment in The Plaza sold for $10.2 million, to warrant a $8 million price jump. Nevertheless, it's back on the market less than three years later for $17.95 million—a staggering $6,033 per square foot. Because, uh, you never know? If somebody will just want to give you a whole bunch of money? Come on, at least Jeff Gordon went into the trouble of renovating his park-facing three-bedroom pad before trying to flip it for a ridiculous amount.