Presenting the one-of-a-kind duplex Penthouse gracing the signature south-facing prow of 10 Sullivan Street, where curved walls of oversized windows reveal inspiring downtown panoramas. Comprising 5,503 interior and 1,378 exterior square feet spread over two terraces, this exceptional 5-bedroom, 5-bathroom, 2 powder-room residence sits atop it all. On the lower level, beyond the private elevator vestibule and gracious entry foyer, a formal central gallery ideal for showcasing significant works of art leads to the magnificent double-height Great Room, where soaring ceilings and three walls of floor-to-ceiling glass offer exceptional light and air and open city views, creating the ideal environment for gracious entertaining and luxurious daily living alike. The sprawling Poliform windowed chef's Kitchen with center island breakfast bar is exquisitely appointed with handsome walnut cabinetry and Lugano marble slab countertops and backsplash, and offers top appliances by Sub-Zero, Miele, and Wolf. A windowed parlor with adjacent powder room, and two secondary bedrooms each with windowed en suite baths complete the interiors of this level, while a 404-square-foot private terrace wraps the northwest corner. Upstairs, a central gallery leads past two graciously proportioned secondary bedrooms, each with windowed en suite baths, to the exceptional Master Bedroom Suite, which enjoys an astonishing 303-square-foot walk-in wardrobe and a spa-like windowed master bath elegantly clad in Dolomite white marble, featuring a Maccassar Ebony Poliform double vanity with Lefroy Brooks fixtures, freestanding soaking tub, separate steam shower, and private water closet. The private rooftop terrace is an oasis above it all, offering stunning 360-degree views, an outdoor kitchen, and an additional powder room for the ultimate entertaining space. From oil-rubbed Danish oak floors to oversize windows, a distinctive palette of sumptuous interior finishes inspired by Soho's rich aesthetic heritage lends authentic character to the spaces' modern design. Modern conveniences abound, including radiant heat flooring throughout, a Savant home automation system, and motorized window shades.