These 30 flats for young people are located in a linear block of ground floor and three floors. On the ground floor there is the car park and on the other floors there are 10 apartments each, all of which are arranged on each side of the central corridor that has the core of vertical communication at the bottom. This building was designed to take the maximum advantatge of the prefabricated building systems. Since these building systems are more difficult to resolve than the traditional ones in case of complications, it was necessary a previous study of estimated problems. Thanks to the rational design it was possible to erect 30 apartments of high quality standards and confort.