Who doesn't love the idea of living in a penthouse? A press of the button marked "PH" and you're at the top of the building in its largest, most private home, outfitted with top-of-the-line finishes and appliances. These apartments have the best views in the building, and some are lucky enough to have private outdoor space to better enjoy them. The term "penthouse" is often synonymous with "pricy," but the following penthouse listings all over Manhattan come in below $1 million.