The 25 story 484,376-SF corporate headquarters tower was designed to house 2,400 employees within the existing eclectic urban fabric of a Paris suburb. The tower is organized around a center core, with the surrounding area dedicated to meeting rooms and office support. The elliptical form expands the building’s footprint for office space by widening in the center to accommodate the core, and narrowing towards the ends resulting in a large floor plate, with maximized perimeter offices. At the urban design level, the composition addresses the duality of the site. The elliptical shape gives the form direction and a dynamic facade. There is no front or back, yet its directional quality conveys movement from Issy to Paris, from the streets to the peripheries, from land to river. Its softly rounded form avoids hard edges and corners, implying a democratic space, and a certain sensuality in its relationship to the green landscape that surrounds the building. Efficient spaces allow for optimal performance of the building and its energy consumption, focusing in particular on use of renewable energy. The building was one of the first in the country to receive the High Environmental Quality label for an office tower, with more than 40 percent energy saving, compared to other structures built at this time. The glass skin of the tower is articulated by a series of recesses that imply a rotational force. Like speed lines or gills, they also provide occasional terraces and executive offices at selected locations throughout the building and add depth and dynamic interest to the otherwise pure prismatic volume. An organic message is projected subtly and mysteriously, yet clearly sculpted and shaped by the technology of man, the form is abstracted to its essence, and wrapped in the modernity of glass and steel.