The theme of the house has always been central to the architectural and urban culture and, at least from the 50s onwards directed and influenced research and the transformation project of the city. Social housing as it is kind, identifying for “neighborhoods” or urban types, it became part of the stratigraphy established the city’s modern and contemporary, with its characters and recognition, rooted in forms of identity and specific urban types. This genetic relationship between architecture and the city had been recognized by the architectural culture since the urban studies, from the typological and Trend, following a line of research that had developed in thought and Italian architecture since the war. The analysis and design always start from this acquisition, referring to themes and templates already substantiated in the fabric of the city, and especially by establishing a constitutive relationship with the urban form and its relation systems. In recent decades, however, the centrality of the house as the root of innovation and core reference for the architectural and urban planning has faded. This phenomenon is also the aspect of a greater spread of ownership, market liberalization and privatization and the gradual erosion of all areas of society and public in the contemporary city.