he building was designed by Kenzo Tange and finished in December 1990 at the expense of ¥157 billion (about US$ 1 billion) of public money. It replaced the former Tokyo Metropolitan Government Building at Yūrakuchō, which was built in 1957 and also design by Tange. The former Tokyo Metropolitan Government Building is now the site of the Tokyo IIt was the tallest building (by roof height) in Tokyo, at 243 meters [797 ft],[3] until the Midtown Tower was completed in 2006.nternational Forum.