Osaka was chosen as the site for the 1970 World Exposition by the Bureau of International Expositions in 1965. 330 hectares in the Senri Hills outside Osaka had been earmarked for the site and a Theme Committee under the chairmanship of Seiji Kaya was formed. Kenzo Tange and Uzo Nishiyama were appointed to produce the master plan for the Expo. The main theme would be Progress and Harmony for Mankind. Tange invited 12 other architects to elucidate designs for elements within the master plan. These architects included: Arata Isozaki for the Festival Plaza mechanical, electrical and electronic installations; and Kiyonori Kikutake for the Landmark Tower.[1]