 His most notable buildings are the main building with the entry hall at the Berlin fairgrounds in 1936 and the Strandbad Wannsee, with fellow architect Martin Wagner, in 1929–1930, where he developed a row of long, low buildings that appear to grow out of the underlying sandhills.Further buildings include several housing projects in Spandau and the Tiergarten city hall in 1935–1936.After World War II, together with Karl Bonatz he presented a plan for the rebuilding of Berlin.