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$13.25 million
Manhattan
Four bedrooms, 4½ bathrooms
A wood-and-metal staircase in this 3,600-square-foot duplex penthouse evokes a 1920s luxury ocean liner. The apartment sits atop Barbizon 63, a tiered, landmarked building that served as a noted residential hotel for women from the late 1920s until it was converted in 2006. It also has…