Loft Apartments Lederergasse is a minimalist roof extension located in Vienna, Germany, designed by Triendl und Fessler Architekten. In addition to numerous technical specifications, the specific structure of the historic building, a very tight budget and local building regulations constitute a strict corset for this roof extension. The basic idea for the design was to reinterpret the spatial qualities of a classical attic. Due to the limited corridor space the apartments have been designed as a zoned on two levels. Deep cut in terraces, stairways, and spatial requirements of the existing structure (chimneys, fire walls, etc.) give every apartment its own individual quality. From the public entrance floor up to the private gallery level, the functions organize self-explanatory within each unit.