Société Générale Building, Banking headquarters in 9th arrondissement, Paris, France.

The Société Générale Building occupies a quadrilateral block between Boulevard Haussmann, Rue Halévy, Rue Gluck and Place Jacques-Rouché. Its rusticated ground floor has round-arched openings, above which rise floors of tall rectangular windows behind continuous wrought-iron balconies; the corner curves under a steep grey mansard roof with dormer windows. A central pavilion at 29 Boulevard Haussmann, added by architect Jacques Hermant, carries a triangular pediment sculpted by Jean Luc.

Société Générale, founded in 1864, moved from rue de Provence and formalised the purchase of a seven-building block on 2 April 1906, after competing with the neighbouring Galeries Lafayette. The block had been built in 1867–1871 by Charles Rohault de Fleury as part of Haussmann's works around the Opéra Garnier. Jacques Hermant rebuilt the interiors, and the headquarters was inaugurated on 26 June 1912 in the presence of Baron Hély d'Oissel; the bank made it its official seat in 1915.

The central hall displays detailed mosaics by Gentil and Bourdet, with a steel-framed glass dome by Jacques Galland showcasing French craftsmanship. The decoration reflects the wealth that Paris banking houses embodied in the early 1900s.

The building is open to visitors during European Heritage Days in September, providing access to the main hall and underground levels. Plan enough time to explore the different floors and their architectural details.

The vault door, made by Fichet with steel from the forges of Le Creusot, is 40 cm thick, 2.76 m in diameter and weighs 18 tonnes; a second armoured drum grille behind it weighs 5 tonnes. The four reinforced-concrete levels hold 8,134 compartments in 399 cabinets and 22 strongrooms, the lowest 11 m down.