A unique structural system made of folded steel plates and concrete girders supports the building. The strength of the materials minimizes the need for vertical supports and allows for a mostly open floor plan, while the height of the structure allows for a spectacular variety of ceiling conditions in the interior spaces. According to the architects, the structural scheme is especially adept at coping with the lateral forces of seismic movements, a necessary precondition of buildings of its size in Japan. [2]