Until the 1920s, there were no significant changes to the building. Neither World War I nor the November revolution of 1918 caused damage to it. In 1920, the administrative burden was considerably increased by the incorporation of several outlying towns and villages into the city of Berlin in the Greater Berlin Act. As a result, some departments and units had to be housed outside the building. In 1929, the Magistrat commissioned the city planning division to develop a concept for a new administrative building encompassing two city blocks that would also link the Stadthaus to the City Hall. This plan also included the existing main city library and the city savings bank. It would have been part of a wideranging plan to redevelop the area of the Molkenmarkt, including replacement of the old and substandard housing along Am Krögel, an alley leading to the Spree. These plans had to be abandoned in 1931 because of the political and economic situation of Berlin after World War I.