Urban environments need a balance between many factors in order to have and maintain an attractive, good level of quality. Trying to combine different uses within the same part of the city (what is called mixed use development) is one of the possibilities to renew cities and promote a general improvement of urban quality and social context. According to these principles, in recent years the principal Italian public experiences related to urban renewal have been devoted to programs of constructions - so called ‘Contratti di quartiere’ that means ‘Neighbourhood contracts’ - in which users participation, promotion of job creation and private investments are more underlined and integrated. The aim is focused to provide not only a new built environment but also a ‘piece’ of the city, with a specific attention to productive and social activities, which would guarantee that the intervention can be a vital one.