Central Park West stunner in an Emery Roth co-op wants $20M

Among the many Emery Roth-designed buildings along Central Park West, the Ardsley doesn't often get as much ink as, say, the Beresford or the San Remo ; but the Art Deco building, which opened in 1931, is a lovely, understated gem. And now, a triplex penthouse in the storied building is on the market for the first time in 30 years, with an appropriately high price tag of $20 million.