St. Elisabeth's was converted into a prison (Arresthaus) in 1807 when the number of attendees dwindled. By 1896 it was used as an administrative building of the Prussian Army and during the Weimar era it was a library for Wehrkreis I. In 1933 the nearby square, Arresthausplatz, was renamed Elisabeth-Platz. The former church finally served as a pension office before the destruction of Königsberg during World War II.