in 1959 the school was moved out of the castle to a newly built school. by the 1970s the last renter moved out of the building, leaving it empty. in 1968 the city offices were removed and the severely neglected building was used as a local art gallery. starting in 1986, a series of renovations took place to clean up and improve the building. at one point the castle had an octagonal tower in the south east corner, but that has been removed