It is notable for the black diagonal braces on its east and west facades.

At the base of the skyscraper is a sunken garden and a surprisingly large plaza.

In 2013, Mitsui Fudosan and Kajima Corporation began installing six massive pendulums on the roof of the building to counter long period ground motion.

[3] The top 55th floor was formerly occupied by a Chinese restaurant called the Mandarin Palace, but now it houses tenant offices.

Media related to Shinjuku Mitsui Building at Wikimedia Commons