Built at the same time as the Engie Tower, the Engie B building complements it. This 50-meter-high triangular building serves to enclose the oval plaza dominated by the tower on the north side. Each of its three facades not only helps to enclose the space and provide it with the best light, but also to define a part of the city, creating a clear boundary between the built environment and public space.

Denis Valode (1946) and Jean Pistre (1951) founded their agency in 1977. Within 20 years, it became one of the most important in France. Their success was due in part to the reconstruction of the Lainé warehouses in Bordeaux and the construction of the L'Oréal factory in Aulnay-sous-Bois.

Today, the two architects are particularly involved in the design of towers in Saint-Denis, Lyon, Beijing, and Mumbai. They make it a point of honor to promote sustainable development in all their constructions. In La Défense, they are carrying out seven projects, including the Engie Tower, Engie B, the Léonard de Vinci university center, and Opus 12.