Designed by the renowned architect Jean Nouvel, the HEKLA Tower stands 220 meters tall (721 ft) over 49 stories, and it features 76,000 square meters (818,000 sq ft) of office space and services designed according to the highest standards.

The design of the first office tower by Jean Nouvel in Paris La Défense is influenced by the Rose de Cherbourg project, Paris La Défense's wide-scale urban regeneration program, and it is a sinuous composition of triangular shapes inspired by the texture of the surrounding urban fabric. Jean Nouvel has designed an aesthetic envelope with many polychrome brise-soleils that, together with the high-performing glass on the building’s façade, regulate the heat. A building that enhances and redefines the skyline of the district through its striking, slender appearance, drawing on a prismatic composition with alternating glass and matte.