The definitive design by Iofan, Vladimir Shchuko and Vladimir Helfreich was conceived in 1933–1934 and took its final shape in 1937. The staggered stack of ribbed cylinders crowned with a statue of Vladimir Lenin blended Art Deco and neoclassical influences with contemporary American skyscraper technology. Work on the site commenced in 1933; the foundation was completed in January 1939. The German invasion in June 1941 ended the project. Engineers and workers were diverted to defense projects or pressed in the Army; the installed structural steel was disassembled in 1942 for fortifications and bridges.