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"Shiba-koen"(Shiba park), Minato-ku, Tokyo, Japan Tokyo Tower Main Observatory,1F "Lookdown Window" Looking down at the ground from a height of 145 m, wow what a view! Automobiles look like minicars or toy cars! Enjoy a breathtaking walk in the sky! Tokyo Tower Data Height of the Tower. 333m Since its opening in 1958, the Tokyo Tower has been the world's tallest self-supporting steel tower. The Eiffel Tower in Paris is 320 m high. The Tokyo Tower weighs about 4,000 tons. It is much lighter than the Eiffel Tower, which weighs 7,000 tons, a result of remarkable advances in steel manufacturing and construction technology.