During the 12 years of Nazi rule, the "Reichstag" building was not used for parliamentary sessions. Instead, the few times that the "Reichstag" convened at all, it did so in the Kroll Opera House, opposite the "Reichstag" building. This applied particularly to the session of 22 March 1934, in which the "Reichstag" surrendered its powers to Adolf Hitler in the Enabling Act, another step in the so-called "Gleichschaltung" ("coordination"). The main meeting hall of the building (which was unusable after the fire) was instead used for propaganda presentations and, during World War II, for military purposes. It was also considered for conversion to a flak tower but was found to be structurally unsuitable.