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The proposed contribution is based on research conducted between 2019 and 2021. It focuses on the analysis of the evolution of the role of a social lessor widely established in the Rennes metropolis (Brittany) that experiments new missions beyond the classic missions of housing supply. This is a limited public action experiment on a priority neighbourhood called “City Policy”. This experiment takes into account a reality other than the housing issue, to be interested in the insertion through employment of inhabitants. The logic that mobilizes the social bailor and is relayed by its agents is based on the notion of “proximity”. In this article, we will analyze how this notion of “proximity”, beyond a single institutional creed, is transformed into the acts implemented by the city’s political professions, as a process of transformation of social intervention on a precarious neighbourhood. This process brings out the work of the boundaries between the different actors involved in their intervention at the scale of this social space. We will present the objectives of the research, its methodology (interviews, observations, documentary corpus analysis) and the main results obtained in terms of the questions of the boundaries of social intervention and proximity.