This paper deals with the influence of territorial context on the intervention of treatment centers for adolescents (“ Maisons des Adolescents”). A particular example is used to demonstrate the existence of this relationship: the Avicennes center (“Maison des Adolescents”) in Bobigny. The paper studies the local particularities of the Seine-Saint-Denis department from the points of view of history, specific problems, and local public policies in the fields of social, health, and youth affairs. It then shows how these elements impact the choices made for the “ Maisons des Adolescents” functioning where the types of care or the innovations are concerned. More broadly, the paper attempts to explain the reasons for the specificities that currently characterize treatment centers for teenagers in France.