The Rathaus was built between 1861 and 1869 in the style of the Northern Italy High Renaissance by Hermann Friedrich Waesemann. It was modelled on the Old Town Hall of Thorn (today Toruń, Poland), while the architecture of the tower is reminiscent of the cathedral tower of Notre-Dame de Laon in France. It replaced several individual buildings dating from the Middle Ages and now occupies an entire city block.