To the south, the limestone curtain wall is broken up in favor of a large glass surface with sun protection in front of it, while to the west, all three upper floors have traditional ribbon windows. Between these windows, however, the façade consists of overlapping slabs of polished black granite in the ceiling area. Both external elevations have the same emphatically horizontal structure, which is clearly reminiscent of the surrounding copper band.
On one of the rare opportunities to visit, visitors can discover a beautiful staircase: in the midst of concrete, stone and glass stands a real work of art in reddish wood.