禮堂
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 center of the site. He lobbied hard for his project, and asked the younger Brazilian architect, Niemeyer, to support and assist him on his plan. Niemeyer, to help Le Corbusier, refused to submit his own 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 center of the site, though this would eliminate Niemeyer's plan to have a large plaza in the center. Niemeyer agreed with Le Corbusier's suggestion, and the headquarters was built, with minor modifications, according to their joint plan.