The NEC Super Tower , often known as "NEC Supertower, SuperTower or simply Supertower", headquarters of NEC Corporation, is a 180-metre (590 foot) tall skyscraper in Minato, Tokyo, Japan. It was completed in 1990 and was designed by Nikken Sekkei. Its primary use is as a commercial office space. Forty-three stories high and five underground, it was constructed at a cost of some ¥60 billion (1999), according to Nikkei Business, January 5, 2007 edition.