Erich Mendelsohn designed the Einstein Tower. It is an astrophysical observatory  located in the Albert Einstein Science Park in Potsdam, Germany. The building is one of Mendelsohns first projects, built from 1919 to 1921. The observatory become function in 1924, and it is still in use today.  The facade of the building was first constructed with concrete, but due to various complexity issues and shortage from the war the building was finished with brick and then covered with stucco. The building was even damaged by bombing during WWII. In 1999, The building went under a full renovation to bring it up to date.