Mexico and the United Nations headquarters in New York City and to the other main UN agencies based in Geneva, Nairobi, Paris, Rome and Vienna. Mexico and the United Nations Mexico is one of the 51 founding members of the United Nations and was admitted into the organization in 1945. Since then, Mexico is a full member of all the UN agencies and participates actively within the organization and has diplomatic relations with most member states. On 26 June 1945, Mexico was represented in San Francisco by Ezequiel Padilla Peñaloza, Francisco Castillo Nájera and Manuel Tello Baurraud in the signing of the United Nations Charter.
Headquarters of the United Nations UN had completely moved out of its Lake Success headquarters by May. The construction of the General Assembly Building was delayed due to a shortage of limestone for the building, which in turn resulted from a heavy snow at the British limestone quarries that were supplying the building's limestone. The erection of the building's framework began in February 1952. The Manhattan headquarters was declared complete on October 10, 1952. The cost of construction was reported to be on budget at $65 million. In 1953, twenty-one nations donated furnishings or offered to decorate the UN headquarters. A new library building for