The Séquoia Tower marks a new turning point in La Défense. Forced to build on increasingly complex sites, architects are abandoning fragmented volumes in favor of pure prisms where curves are the constant elements. The Séquoia Tower thus features a dihedral facade on one side and a circular arc on the other. The latter echoes both the vaulted roof above it and its new facades, designed in 1989.

The two sections are connected by a horizontal elevator spanning the pedestrian walkway. Inside, the office spaces are arranged around a central atrium and are lit by a double glass skin. The building is one of the first smart buildings, integrating all the latest IT technologies.

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.