If you wanted to buy a fun-filled New York City penthouse, you lost out — and you’ll have to take it in slide. Now, the only question a forthcoming owner will have to ask in the morning is whether they to go head or feet first down a four-story slide in this penthouse quadruplex, nestled in the crown of a 19th century landmarked Beaux-Arts building. Indeed, this aerie comes equipped with a massive stainless steel slide, and it only took a few months for the $20 million listing to find a buyer.