International audienceThe recent emergence of a housing supply for the lower middle classes has profoundly transformed the outskirts of Mexico City's metropolis. The first mass real estate operations in Mexico are now about twenty years old: this temporal hindsight makes it possible to understand the diversity of local configurations and arrangements, between developers, public authorities and inhabitants, around the processes of settlement and consolidation of these "pieces of the city". Through the analysis of official data on resident populations as well as on the production of housing on the one hand, and exploratory surveys of residents and stakeholders involved in this production on the other, the integration of this stock at differen...