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Rockefeller eventually became involved in the project and, in 1928, leased the Columbia site for 87 years. Rockefeller's lease excluded land along the east side of Sixth Avenue, to the west of the Rockefeller property, as well as at the site's southeast corner. Rockefeller hired Todd, Robertson and Todd as design consultants and selected Corbett, Harrison & MacMurray; Hood, Godley & Fouilhoux; and Reinhard & Hofmeister as architects for the new opera complex. However, the Met was unsure about moving to the new complex, and the Wall Street Crash of 1929 put an end to the plans. Rockefeller instead entered into negotiations with the Radio Corporation of America (RCA) to create a new mass-media complex on the site. A new plan was released in January 1930, and an update to the plan was presented after Rockefeller obtained a lease for the land along Sixth Avenue. Revisions continued until March 1931, when the current site-design was unveiled. A late change to the proposal included a complex of internationally themed structures along Fifth Avenue.
All structures in the original complex were designed in the Art Deco architectural style. Excavation of the site started in April 1931, and construction of the first buildings began that September. The first of the complex's edifices was opened in September 1932, and most of the complex was completed by 1935. The final three buildings in the original complex were built between 1936 and 1940, although Rockefeller Center was officially completed by November 2, 1939. The construction project employed over 40,000 people and was considered the largest private construction project at the time. It had cost the equivalent of $1.4 billion in 2016 dollars to construct. Since then, there have been several modifications to the complex.
