The objective was to enhance a triplex penthouse for a family's pied-à-terre. Integrating local red brick townhouse aesthetics, the design modernizes the upper addition with distinct window proportions. A double-height living space features expansive windows offering oblique city views, creating a captivating two-story sunroom. The master suite overlooks this space, visually extending its spacious feel. A key design element is the private stair with glass partitions, fostering a continuous space, while the enclosed public stair seamlessly interlocks. Warm wood materials unify the triplex.