As of 2011, it manages 107 office facilities in Japan and China, with a total of 1,160,000 m2 (12,500,000 sq ft) of space.

[3] Taikichiro Mori, the founder, quit his job as an economics professor and entered the real estate business.

He became the richest man in the world in 1992 with the net worth of $13 billion U.S. dollars.

At the time his net worth was double that of Bill Gates and $3 billion more than Yoshiaki Tsutsumi.

Taikichiro Mori died of heart failure on January 30, 1993, at the age of 88.