Pyramidion and Adamas, located on either side of a garden, together with Building B, enclose the northern area of the Danton development zone. Built on a triangular base, the two buildings stand out from the ordinary thanks to their slightly irregular layout. One of the facades is delicately curved, while the other, particularly Pyramidion, features an extension and a canopy. The latter has a load-bearing facade embellished with vertical windows rather than a traditional curtain wall.

Adamas, for its part, features rounded corners, reminiscent of the style of buildings from the 1950s. Through these architectural elements, the two buildings create a delicate transition between La Défense and the city of Courbevoie.

Founded in New York in 1955 under the name I.M. Pei and Associates, the Pei, Cobb, Freed and Partners agency changed its name in 1989, the year in which Ieoh Ming Pei (1917) completed the Louvre Pyramid.

Considered one of the most important American firms of the post-war period, it has carried out projects all over the world: the extension of the National Gallery in Washington, the design of the Miho Museum near Tokyo, the construction of the John Hancock Tower in Boston, and more.

The agency has been involved in the Tête Défense project since 1973. After Peï's retirement in 1990, his partner, Henry N. Cobb, took over the reins. At the head of Peï, Cobb, Freed and Partners, he designed two office buildings near the GDF-Suez tower: Adamas and Pyramidion.