The southern end of the square is formed by the circular buildings, a uniformly designed row of buildings designed by Weinbrenner. The buildings were first used by privileged citizens, officials and officers as homes, later there were some Baden ministries. During the Second World War, the area was severely damaged, so that the buildings were then rebuilt in factual style as government buildings. In the process, the unified archways planned by Weinbrenner for the Schlossplatz were considered again. The uniform building height and continuous front receive the uniform image and the optical relationship to the castle. Today, the premises include the regional council, the district court, the headquarters of the L-Bank and the tax office.