Pirineos 125 is a department building that answers to the neediness of households in Mexico City. The project maximizes all the areas reducing the circulations and giving the priority to the living spaces. The building is spread in four levels, has eleven departments and a roof garden. The departments, with 67 m2, have two bedrooms with bathrooms, living-dining room and kitchen. The design provides natural light to all the rooms and the curtain wall facade creates a shadow play through the living room.