What started as a modest refurbishment of a penthouse apartment in the hills of Vienna’s 19th district quickly became a major renovation, largely due to an enthusiastic and close working relationship with the client. The space was originally planned for two separate apartments divided by a dark vestibule. The smaller of the two apartments was unoccupied and used as extra storage space. Our design removes most of the non-structural walls and merges the two dwellings. The space is reorganized through a clear division between common and private areas. A generous vestibule buffers the bedrooms from the living room/kitchen area. A built-in storage cabinet running the length of the vestibule acts as a spine from which the two areas are accessed. Large, single pane windows running from the floor to just below the ceiling height take advantage of unobstructed views of the city skyline. A unified material palate runs through the entire space, keeping most surfaces in related tones of gray. All floors and wet walls are monolithic cement-based surfaces. The built-in cabinetry is faced with brushed and stained oak boards. Incandescent light rods are periodically built into the cabinetry or engaged in the walls to provide a warm atmospheric glow.