In the city, a gap between central and peripheral areas has always been present: basically, in the former were concentrated service industries, and in the latter residential and industrial activities. With the city growth, the gap increased: more request for services produced a higher density in the core of the city. This paper stresses the need for a new model of urban organization, in order to overcome the core-periphery dichotomy; this new model could be based on community, and its relation with physical space and its activities. So, some intervention steps must be planned to weigh on the whole population. Re-organizing the city, the creation of integrated areas seems the best solution; so, not only industry service or executive activities, but also other ones that are the essence of city (commerce, culture, recreation, etc.). Such activities could integrate the vocations of urban context; in this way, a fermentative reaction and a new urban quality are possible.