Winner of a competition in 1968, the building combines a band-like structure (including a steel truss bridging Fennstraße with a deck level and four office floors built on top) with a tower of 16 floors hanging from two concrete shafts carrying elevators and staircases. While the office floors have a facade of stainless steel elements, the exterior of the lower entrance building is made of structured concrete elements. Special thanks to Andor Wagner.

The masterplan for the redevelopment of the site (by Barkow Leibinger, chosen in a 2010 competition) provides for the replacement of the old headquarters by a new office tower at the opposite corner of the site (design by Sauerbruch Hutton). While the progress of the project was temporarily halted for some time, the preparation of works for the new tower seems to make progress now. Although both buildings might coexist for a few years, the plan is to eventually take the old building down.