The project investigates an infill prototype on a twenty-five-by-eighty-foot lot typical of the South of Market neighborhood. The three units are each characterized by volumetric space and floating mezzanines; the top unit is our office. The party walls are thickened to a depth of five feet, becoming service zones along the windowless walls. They house access stairs, kitchens, bathrooms, storage, and fire escapes, which double as small outdoor balconies. The fifteen-foot-wide open space in the center is structured by a basilica frame constructed of Parallam wood, which acts as a scaffold supporting floor space and mezzanines; these can be added or removed using truss joists. A four-by-eight-foot module, based on a standard piece of sheet material, establishes all dimensions. Electrical, sprinkler, and water pipes run vertically and are fed into the space horizontally. Everything is exposed, the essential elements and construction creating the aesthetic. The street level contains parking. The main stair continues the street into the building, evoking the hills of San Francisco. The front facade is a revitalized bay window constructed of horizontal aluminum siding woven with sliding windows. The roof, free of the constraints of codes and restrictions, folds to provide clerestory lighting for the top unit. The new scale of the building in the streetscape recognizes the shift in program from the domesticity of Victorian rooms to the contemporary space of the loft. Selection of building materials was purely economic, providing a model of affordable, quality construction. Reconstituted materials were selected where possible, with a goal of finding products without surface that over time will show the traces of wear rather than delaminate.