This article focuses on the use of interchange station in real estate of the Lille metropolitan area. Two interchange stations are particularly studied in the suburban area. The interchange stations involve at least two modes of public transport and also have urban and service functions. The contemporary evolution of urban planning tools in the Lille metropolitan area is described in the first part. The tools are less and less sectoral and combine housing and transport issues more closely. Their objective is to contain urban sprawl near interchange stations. The methodological elements are explained in a second part. These elements correspond to the coding of real estate ads for four years and a protocol of interviews with intermediaries in the real estate markets (real estate agencies, developers...). The methodology could be used again in sectors where public transport projects are planned. In the last part, the results show that the effects of spatial planning policy, although less sectoral than before, are linked to its appropriation by intermediaries in the real estate markets. Their speeches shape the interchange station for commercial purposes, sometimes in contradiction with the limitation of urban sprawl. The interchange stations are masked by the vocabulary of centrality. They are used to maintain an argument relating to the duality between automobile and public transport. They can promote urban sprawl. A public policy, shared before its implementation with intermediaries, could make it more effective in terms of habitat and mobility, in metropolitan area.