Hôtel de préfecture et du département de Seine-Saint-Denis, Administrative building in Bobigny, France

The Hôtel de Préfecture et du Département de Seine-Saint-Denis is an administrative building with a distinctive asymmetrical pyramid shape clad in dark concrete panels and featuring continuous horizontal window bands. The structure houses public reception areas on lower levels alongside administrative offices and private residential spaces in the upper floors.

Seine-Saint-Denis was created on 10 July 1964 from parts of Seine-et-Oise and Seine-et-Marne. A decree of 23 December 1964 tasked Henri Bouret, its first prefect, with building a new administrative centre; rural Bobigny was chosen for its large land reserves. Architect Michel Folliasson, picked by the Ministry of Culture, built the prefecture between August 1968 and July 1971, replacing prefabricated offices used for six years.

The building's name links the prefecture and the departmental council, both housed here since the site opened in 1971. The long banner across the facade, reading "Clichy-sous-Bois" and "Montfermeil", recalls the two towns whose 2005 unrest led to a national debate on the banlieues. The esplanade Jean Moulin, named after the Resistance leader, is the address.

The building stands on the esplanade Jean Moulin along rue Carnot, in Bobigny's town centre, next to the town hall and the Bobigny 2 shopping centre; the Bergère departmental park lies to the south. The prefecture and the departmental council headquarters share the site, so check which service you need before going. The ground level is recessed behind glass doors, with a sign of blue, white and red panels.

The building replaced prefabricated structures that housed prefecture services for six years. Its base measures about 70 metres and it rises to 34 metres. It was built by the SEMARBO, a mixed-economy company run by the municipality, and inaugurated in 1971.