The entire seventh floor of The Strathmore in Morningside Heights just hit the market for a whopping $16 million. The floor consists of two separate 10-room apartments that can be combined into one 20-room mega-apartment with around 100 feet of Hudson River frontage. The floorplan presented with the listing, impressive in size, basically just jams the two units together, though, so there are a total of six-bedrooms and also two [edit: make that three] kitchens, two foyers, two dining rooms, etc. With a renovation, however, the apartment could feature, essentially, any kind of room you could imagine. Want to make one of those dining rooms into a giant ball pit? Go for it. You've got rooms to spare.