At the end of the nineties of the last century the town of Sant Celoni was creating new areas to receive housing since the demand for it was growing after a long time of almost no new developments. One of these new neighbourhoods is 'Les Torres'. It's urban planning has been based on the continuation of the structure of the old town: blocks -with their perimeter fully filled with (apartment-) buildings consisting of three floors- organised along a local interpretation of a beaux arts street pattern and with here and there a deserted little square. Our plot in 'Les Torres' is a rectangle of 30 by 15 buildable square meters with a free strip in the backyard and a maximum amount of 15 apartments to be raised there (as was stipulated by the local building code). Among other municipal obligations was the fact that the ground floor had to be situated at least one meter from street level thus causing an uncomfortable obstacle for getting properly to the elevators by wheelchair, but on the other hand we could take advantage of it by leaving open the space between the street and the ground floor in the facade to have a naturally ventilated car park in the basement . The 15 apartments are distributed over the three floors in three equal groups of five with two units of elevators and staircases. On each floor three dwellings are organised transversally -facing the street on one end and the backyard on the other-, leaving the other two to be oriented sideways towards the free lateral end facade. The organisation of the apartments is simple and clean: a centrepiece of service elements (kitchen, bathroom, shafts) as to separate a big diaphanous living/dining from the bedrooms. The concept of the elevation is an abstraction of a renaissance facade with its strongly rusticated base and an almost dematerialised upper part. The windows become almost invisible in their dark continuous bands and the only horizontal interruptions allowed are the two overall cuts to mark the entrances and to give natural daylight to the public staircases.