The delivery of the Chassagne and Alicante towers, now known as the Société Générale towers, was the result of a long consultation process. To consolidate all of its services, the bank decided to move to La Défense, in the Valmy district. The Chaix et Morel agency was then put in charge of the project. However, a dispute between the architects and the bank led the latter to choose another site: the Paris Rive Gauche urban development zone in the Austerlitz area. A new consultation was organized in 1990. Société Générale then selected the twin tower project for which the Andrault et Parat agency, with the participation of Nicolas Ayoub, had just submitted a building permit application.

Despite its off-center location, the complex stands out from its surroundings due to its height of 167 m. Its original shape consists of bevelled half-cylinders connected by a central volume housing the agora and trading rooms.

The perfect symmetry of the two towers, used for banking and administration respectively, nevertheless conceals a few differences. Chassagne has white limestone interior cladding, while Alicante is adorned with red marble. As befits its presidential status, one tower is twice as high as its neighbor.

Particularly exposed, the facades were designed to withstand winds of 350 km/h. The entrance is marked by a spiral by sculptor Tom Carr.

Michel Andrault (1926) and Pierre Parat (1928) joined forces in 1957 and occupied a prominent place on the French architectural scene for nearly forty years. Known for their work on housing (the Pyramides d'Epernay and Evry), they also designed major facilities such as the Palais Omnisports de Paris-Bercy.

In 1985, they entered La Défense and, like Henry La Fonta, established themselves as the most influential architects on the site. They accompanied its transformation for nearly ten years and designed several master plans. In terms of achievements, Michel Andrault and Pierre Parat participated in a dozen projects, including the restructuring of the CNIT and Le Michelet-Gan Groupama. In 1997, the Renaissance Hotel marked their last collaboration. Michel Andrault then continued his career by founding the Conceptua agency with Nicolas Ayoub.