One of Manhattan's most unusual condo buildings is 455 Central Park West, the former New York Cancer Hospital that was converted to residences a decade ago. The landmarked building is home to only 16 residences, and considering the structure's design—it basically looks like a tiny castle—it's pretty exciting when one of those hits the market. The latest unit, a maisonette, is asking $8.75 million, and occupies two of the building's turrets, which are connected by a nearly 24-foot gallery. The apartment itself has over 4,200 square feet of space and features a massive private courtyard. Everything about this elegant apartment screams spaciousness. The living room has a 13-foot tall ceiling and comes fitted with oak floors, a custom-designed marble fireplace, and six windows overlooking Central Park. The master bedroom in this four-bedroom apartment is no less grand with access to the courtyard, and large windows that fill the room with sunlight. Amenities in the building include a swimming pool, a fitness and spa center, and a common garden. All said and done, this castle-style apartment is definitely fit for a king.