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Postwar projects, United Nations headquarters (1947–1952)

Le Corbusier made another almost identical Unité d'Habitation in Rezé-les-Nantes in the Loire-Atlantique Department between 1948 and 1952, and three more over the following years, in Berlin, Briey-en-Forêt and Firminy; and he designed a factory for the company of Claude and Duval, in Saint-Dié in the Vosges. In the post-Second World War decades, Le Corbusier's fame moved beyond architectural and planning circles as he became one of the leading intellectual figures of the time.

In early 1947 Le Corbusier submitted a design for the headquarters of the United Nations, which was to be built beside the East River in New York. Instead of competition, the design was to be selected by a Board of Design Consultants composed of leading international architects nominated by member governments, including Le Corbusier, Oscar Niemeyer of Brazil, Howard Robertson from Britain, Nikolai Bassov of the Soviet Union, and five others from around the world. The committee was under the direction of the American architect Wallace K. Harrison, who was also the architect for the Rockefeller family, which had donated the site for the building.

Le Corbusier had submitted his plan for the Secretariat, called Plan 23 of the 58 submitted. In Le Corbusier's plan offices, council chambers and General Assembly Hall were in a single block in the centre of the site. He lobbied hard for his project, and asked the younger Brazilian architect, Niemeyer, to support and assist him with his plan. Niemeyer, to help Le Corbusier, refused to submit his design and did not attend the meetings until the Director, Harrison, insisted. Niemeyer then submitted his plan, Plan 32, with the office building and councils and General Assembly in separate buildings. After much discussion, the Committee chose Niemeyer's plan but suggested that he collaborate with Le Corbusier on the final project. Le Corbusier urged Niemeyer to put the General Assembly Hall in the centre of the site, though this would eliminate Niemeyer's plan to have a large plaza in the centre. Niemeyer agreed with Le Corbusier's suggestion, and the headquarters was built, with minor modifications, according to their joint plan.