The building's anchor tenant is the international law firm Clifford Chance.

Until 1979 no investor had been found to finish the building because of high construction costs and a lack of prospective tenants for the office space.

Later the ECE project development company stepped in and reached an agreement with owners and artisans, and developed a construction program for completion and technical improvement as well as a rental concept.

In 1981 the tower was finally finished and comprised approximately 52,000 m2 (560,000 sq ft) of gross floor area.

As of end of April 2007 approximately 17,000 m2 (180,000 sq ft) of office space on the lower 20 floors were not let.