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While inner city neighbourhoods undergo gentrification and urban redevelopment attempt to improve social mix in public housing projects, other areas that concentrate people from the working-class appear in France in “decayed condominiums”. This article gives account of this phenomenon through the study of a condominium project emblematic of this problem: “Les Bosquets” built in 1965 in Clichy-sous-Bois-Montfermeil (a Parisian suburb). The socio-demographic study of this private estate of 1 500 appartments shows that the households are mainly immigrant families with very little economic security. Their residential itineraries reveal that this kind of decayed condominium is not a refuge that brings them more stability. On the contrary, the condominium difficulties (especially the high condominium fees) increase their insecurity and put a strain on their economical resources. “Les Bosquets” is a case-study of a larger phenomenon that is now recognized in France as a new public problem.