Following his death in 1993, his two sons Minoru Mori and Akira Mori disagreed as to how to continue the business, with Minoru wishing to continue the company's focus on existing properties and new large-scale urban projects, and Akira wishing to expand the company's portfolio into more small-scale office and leisure properties.
Mori Building, which spent years planning and completing the Roppongi Hills complex in central Tokyo, focuses on multibillion-dollar complexes; Mori Trust sticks to single or twin structures.
[2] Mori Trust announced in December 2015 that it would begin investing in the United States, starting with the $658 million acquisition of two office buildings in Boston from Liberty Mutual.
The company was also reportedly examining potential investments in New York, Washington and other East Coast cities, with a total budget of 100 to 200 billion yen.
[3] As of 2024 Mori Trust owns commercial properties in Boston, New York, Washington, and Northern Virginia.