The sloping topography and the possibility of opening to different landscapes – mountains at one side and the city and its lights at the other – defined the organization of the house. A subtle ramp reaches an interior plaza that houses the parking area and offers an undulating staircase that connects with the upper level, where to glass rooms define a semi interior courtyard. The frontal social spaces open to the mountain, while the leisure areas connect with the kitchen and allow the use of a grass flat area behind the house. Laterally, facilities and circulation are located in a discrete way.At the third level the intimate spaces are located, offering to the master bedroom the night views of the lights of the city. The pos-tensioned concrete structure associated with thin steel tube columns allowed larger spans with a considerable reduction of the mass of the structural elements.