The building is a trapezoid of 62,15 x 15,20 m whose shape is determined by the shape of the plot of land. The structure is a 4.62 m grid of 22 cm reinforced concrete walls, which optimizes the area of the parking (parking places of 2.25 m width). The structure optimizes also the dwellings area, and the floor slabs of 30 cm thick avoids the longitudinal beams. On the long sides, 1.20 m width galleries girdles the building. These galleries, as well as the lateral sides of the building, are closed by vertical terracotta shutters on metal structure. Behind this protective skin which allows to filter the light and to regulate the ventilation, the building is closed by sliding panels of glass over the whole height. The terracotta, material easy to find, is warm and familiar, can be produced in a traditional way and is well known in the Spanish architecture. The structure of the apartments is designed in such a way as to create a day area as large as possible, in open space, integrating the kitchen, and a separate night zone, grouping the bedrooms and the bathroom. All the apartments have a double orientation. The apartments on the ground floor have generous private terraces of 20 m2 each. Solar panels are placed on the building's terrace to reduce energy consumption.