For their second joint project, the architects have taken the opposite approach to the vertical logic of the business district. They have constructed a 30,000 m² complex, equivalent to a first-generation tower, with a height of no more than 37 m.

Despite its horizontal design, the building is in keeping with the agency's other projects, with its glass façades, silver aluminium profiles and dark blue spandrels.

Founded in 1936 by Louis Skidmore and Nathaniel Owings, later joined by John Merrill, Skidmore, Owings and Merrill is one of the world's leading architectural firms. Known for its ability to combine design excellence with innovative construction, it has designed numerous office buildings, airports and engineering structures. Its Lever House, built in 1952 in New York, became one of the icons of international modernism. In 2009, the firm designed the world's tallest tower: the Burj Khalifa in Dubai (828 m).

In 1969, it was invited by Epad to act as a consultant for the Fiat Tower, now known as Areva. For the project, it joined forces with French architects Saubot and Jullien. Although the Franco-American duo submitted bids for the EDF and Engie towers, they did not design any more buildings in La Défense until 2004, when Défense Plaza was completed.