The building was heavily damaged by Allied bombing in World War II and rebuilt to the original plans between 1951 and 1956. The "Neues Stadthaus", which survived the bombing and had been the head office of the Berlin city fire insurance company in Parochialstraße was the temporary city hall for the post-war city government for all four sectors of Berlin until September 1948. Following that time, it housed only those of the Soviet sector. The reconstructed Rotes Rathaus, then in the Soviet sector, served as the town hall of East Berlin, while the Rathaus Schöneberg in Schöneberg borough was seat of the West Berlin Senate. After German reunification, the administration of reunified Berlin officially moved into the Rotes Rathaus on 1 October 1991.