This article analyzes the dissemination of expertise as a dominant modality of management of agricultural real estate on rural territories that are in the process of urbanization. It highlights factors that have allowed for the passage of real estate’s government by and for the agricultural profession to more fragmented forms of public action, where actors and very diverse reference tables are mixed. This point of view draws up a reading of the transformation process of the real estate’s actors with a glance that is attentive to the agricultural and urban worlds and to the balance of power present. It is in a way a rural sociology that invites itself to be set at the borders of the city, in the meanders of the urban schemes, by leaning on inquiries covering a diversity of situations, scales and interlocutors.