Opening on Friday will be Japan's tallest living structure, the 1083 feet tall Mori JP Tower, replacing Osaka's Abeno Harukas.  Just bit shorter than Tokyo Tower. The lower floors will be for commercial facilities and the Keio University Center for Preventive Medicine.  The upper floors will be residences run by the Aman Group. Remember Aman?   The most expensive hotel in Tokyo .  The Ritz Carlton is #3. Mori Building was started in 1955 by an economics professor, who went on to build a real estate empire and become the RICHEST MAN IN THE WORLD.   Taikichiro Mori 's net worth in 1992 was $13 billion, double that of Bill Gate's that year.  Mori passed away the following year at the age of 88. Each building in Japan is named according to its chronological building date.  Mori Buildings was not only responsible for Roppongi Hills ( 2003 ) in Tokyo, but also the  Shanghai World Financial Center  ( 2008, 1614 feet, which at that was the second tallest in world ) and  Jakarta