When Kochendorf, Jagstfeld and Hagenbach were merged to form today's Bad Friedrichshall, a connecting town center was missing. As part of an architectural competition, Roland Ostertag developed an urban planning concept that included several infrastructural facilities, as well as the new City Hall of Bad Friedrichshall. It turned out as a one- to four-story reinforced concrete skeleton building, consisting of three cubic bodies pushed into each other. The construction is characterized by exhibiting itself: All concrete columns visible inside and outside are made of exposed concrete and are staged as space-creating elements, which comes into its own especially in the area of the staircase, which is open across all floors. The floor plan is based on a grid system. Between the concrete columns, interchangeable wall partition systems made of wood can flexibly adapt the office spaces. The council chamber, on the other hand, clearly has its defined place in the mainly closed concrete cube that is pushed out towards the fourcourt which is decorated by landscaped water basins and a sculpture by artist Ursula Sax. 

The city hall is designed 1.5 stories higher than the surrounding architecture to stand out dominantly as the center of the town, but is open on all sides with glass fronts in the lower area to relate to the entire surroundings.