The Shinjuku Mitsui Building is an office high-rise in Nishi-Shinjuku, Shinjuku, Tokyo. Mitsui Fudosan owns and developed it. Nihon Sekkei designed it, and Kiyoshi Mutō was the structural engineer. Construction ran from 1972 to 1974, and the building opened in September 1974. It has 55 floors and rises 224.9 meters to its architectural top.
From September 1974 until March 1978 it was the tallest building in Tokyo and Japan, until Sunshine 60 was completed. The design follows 1970s American high-rise styles. Its black facades and black diagonal braces on the east and west sides make it distinctive. A sunken garden and plaza sit at the base, and the lobby is on the second floor.
In 2013 six roof pendulums were installed to counter long-period ground motion. There is no public observation deck.
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