During the reconstruction, the building was first almost completely gutted, taking out everything except the outer walls, including all changes made by Baumgarten in the 1960s. Respect for the historic aspects of the building was one of the conditions stipulated to the architects, so traces of historical events were to be retained in a visible state. Among them were graffiti left by Soviet soldiers after the final battle for Berlin in April–May 1945. Written in Cyrillic script, they include such slogans as "Hitler kaputt" and names of individual soldiers. However, graffiti with racist or sexist themes were removed, in agreement with Russian diplomats at the time.