First time on market, this custom-built 3 bed 2 1/2 bath penthouse duplex is a gut renovation by a premier builder in a rare, double-wide brownstone. Enter immediately up the front steps to the most glamorous open-concept kitchen, living, and dining area w/ bay windows overlooking the square's fountains and flowers. Featuring rich hardwood floors and a dramatic gas fireplace that anchors the space and begs to host grand parties. The sleek designer kitchen features a waterfall stone island, striking countertops, and professional chef upgrades, and leads to a sizable walkout deck for year-round BBQs. A classy curved staircase adds architectural edge, leading you to two large bedrooms as well as the opulent primary bedroom with an ensuite bath and custom-designed walk-in closets. An easy, full staircase leads to a fully outfitted roof deck with the best city views. Deeded parking. As a 2-unit association, this home stands out as a design-driven, one of a kind masterpiece in city living.