The National Basketball Players Association (NBPA) is a labor union that represents National Basketball Association (NBA) players. It was founded in 1954, making it the oldest trade union of the four major professional sports leagues in the United States and Canada. However, the NBPA did not get recognition by NBA team owners until ten years later. Its offices are located in the historic Park and Tilford Building in New York City. It was briefly a trade association after dissolving as a union during the 2011 NBA lockout.