For several decades until 2024, it served as the headquarters for DekaBank; other tenants are Deutsche Bundesbank (since 2015) and Franklin Templeton.

The Trianon's layout is roughly the shape of an equilateral triangle, the corners of which are formed by three-sided towers.

In 2007, DekaBank sold the building to the Morgan Stanley European Office Fund (MSEOF).

In June 2015, Morgan Stanley and Madison Real Estate sold the building to the US investor NorthStar Reality Europe for the equivalent of US$540 million.

[8] In June 2024, Trianon's owner Geschaeftshaus am Gendarmenmarkt filed for insolvency in a Frankfurt court.