This apartment building with 28 social housing units is part of the Fauvelles urban regeneration zone in Courbevoie, a stone’s throw away from the towers of la Défense. Consisting of 2 blocks with somewhat blurred outlines, hidden behind the forest of ‘green’ concrete bars that shape the many walkways and loggias. It brought transparency, opened up vistas and extended visibility, and also came closer to the user quality standards and more intimate scale of a single-family house. These four-room apartments have an additional room in the shape of a white cantilevered cube placed at random on the façade and ‘plugged’ onto the sitting-room. Bringing modularity and flexibility to the accommodation, the use of this extra room will develop along with the family unit’s own wishes and requirements. Loggias, balconies and landings are all external spaces that extend the useful surface area and provide this invaluable impression of living outdoors.