From 1920 to 1925 he was managing director of the School of Arts and Crafts at Cologne (later known as the Kölner Werkschulen). In 1925, Ernst May, then government building surveyor in Frankfurt am Main, made him chief of the city's municipal building department which was responsible for the New Frankfurt project. Elsaesser kept that post until 1932. His largest construction during his time at Frankfurt was the Grossmarkthalle.