High-quality residential structures are much more than merely a series of different floor plans. First and foremost, the urban apartment house mediates between the private refuge and the public space of the city. In the process, boundaries between inside and outside are negotiated on a wide variety of scales. Housing + focuses on investigating spatial and architectural as well as social and communicative interfaces in residential construction. The publication is divided into four chapters - "Urban Planning," "The Ground Floor," "Building Structure" and "Facade" - to which sixty-seven international projects are assigned.