This roughly 400-square-foot studio is yet another log to add to the fire of our fascination with very, very small apartments. The Murray Hill co-op has a copious number of built-ins: shelves, closets, cabinets, and a queen-sized Murphy bed to boot. It also has what the brokerbabble calls "a private spa." There's a window, a Jacuzzi tub, and a marbled hand-painted ceiling, so if that's what makes up a spa, then this apartment has it. Every inch is maximized to the fullest, and the kitchen's pass-through window and flip-down custom steel table make for easy entertaining despite the limited room. It even manages to pack in a "home office nook." Building amenities include private storage for rent, bike storage, and a communal garden. All this for $355,000 plus $967/month in maintenance. Can the bevy of design touches compensate for the lack of square footage?