The first building in the business district revitalization program launched in 2005, Euronext replaces the Bostik-Tetris building constructed in 1983 by Henri La Fonta. Located at the foot of the CBX tower, this small building has no load-bearing points inside the offices. This design choice favors natural lighting. The metal staircases are designed for regular use. The upper part of the glass facades and spandrels are screen-printed with a plant motif. Above the entrance door, this screen printing is cut out to form a gigantic portal, creating the illusion of a second skin.

Founded in 1969 by Jean-Marie Charpentier, the Arte Charpentier agency has nearly 130 employees. Relatively low-key in the 1970s, it made a name for itself with the design of the Météor Saint-Lazare station in 2003.

In 1997, the agency began a series of collaborations with Robert Lewis Turner, known for his work with Skidmore, Owings and Merrill on the development of London's Canary Wharf. Turner, a specialist in office buildings whose concept is based primarily on flexibility, designs all his projects using metal frames. This has become an increasingly prominent feature in La Défense since the 1980s.