Tokyo Tatsumi International Swimming Center  The swimming complex was designed by the Environment Design Institute, a Tokyo architecture firm. It was commissioned by the Bureau of Port and Harbour, a unit of the Tokyo Metropolitan Government. The building is built largely of steel-reinforced concrete except for the roof, which is a steel pipe space-truss structure. The structural design was by Kozo Keikaku Engineering. The complex was substantially completed in March 1993. It will be used at the 2020 Summer Olympics in Water polo.