The law of July 10, 1964, voted under Pompidou’s government with the goal of reorganizing the Paris region, led to the creation of seven departments (Paris, Hauts-de-Seine, Seine-Saint-Denis, Val-de-Marne, Essonne, Yvelines and Val-d’Oise) and the disappearance of the Seine and Seine-et-Oise. This was followed by the choice of principal cities and the construction of their new prefectures, including those in the inner suburbs of Bobigny, Créteil and Nanterre... This article studies the capacity of these projects to express the power of the state and their ability to create an adequate framework for local public services, by taking into account the interpretation of the programs made by the architects (respectively M. Folliasson and J. Binoux; D. Badani and P. Roux-Dorlut; A. Wogenscky), the architectural means of the time and other factors that can have an impact on the perception of the buildings. This article will look at, on the one hand the will of the project owner, the nature of the programs, the choice of sites and the quality of the urban environments and on the other, the changes undergone by the buildings and their maintenance. These analyses will finally be confronted with the reception of the public today (agents, users, residents).