Although completely independent, Michelet Galilée adopted the same architectural spirit as Allianz Acacia and Sofitel La Défense. The building stands out from neighbouring towers not only because of its size but also because of its very Parisian appearance. The austerity of its structure is offset by a play of rotunda angles and a large opening from the lobby onto the esplanade.

In collaboration with Vittorio Gregotti, Fernando Urquijo designed all of the individual workspaces. The quality of the interior environment is achieved through the simplification of the furniture, which is made from a single type of wood.

Gino Valle (1923–2003) was one of the most important figures in post-war Italian architecture. A disciple of Carlo Scarpa and Walter Gropius, he was particularly influenced by the work of Frank Lloyd Wright.

Mainly active in the Venice area, he teamed up with Giorgio Macola to design the courthouse in Padua and the Giudecca housing complex in Venice. In 1985, the duo opened an agency in Paris with Fernando Urquijo, an Argentine architect known for IBM's architecture programme. They led the renovation of the Îlot Édouard VII in the 8th arrondissement of Paris.

In La Défense, the team designed the Allianz Acacia building and the Sofitel La Défense. Fernando Urquijo and Giorgio Macola also participated, with Jean Willerval, in the construction of the Descartes Tower for IBM.