This research aims to design the paths through is possible to improve historical buildings located in centers which show signs of abandonment by original inhabitants and where a large part of the inhabitants are immigrants . The Italian population which remains generally lives in the “best” areas of these run down historical centers. In Italy there are 6.989 municipalities having fewer than 10.000 inhabitants (86% of all municipalities); with a population 0f 19.000.000, they represent 32,7% of the population of Italy. In many of these centers “a chain of degradation” is showing. Their properties thus run down, they can obtain only lower rents, the only ones affordable for many immigrants. Often the private owners expect the municipal administration to upgrade the public spaces near their properties in order to enhance their value. In many of these centers “a chain of degradation” is showing. Often the private owners expect the municipal administration to upgrade the public spaces near their properties in order to enhance their value. To regenerate and increase the value of the real estate it is possible to follow two approaches at same time: on the one hand economizing on the costs of the physical rehabilitation (social housing, self-recovery, etc.) and on the other improving territory with roads, parks, infrastructures, etc. while creating services. In this way the immigrants and their culture may be considered a revitalisation resource.