 Most of the industry's major companies had moved in by World War II, and building manager Helmsley-Spear restricted new leases exclusively to toy companies starting in the 1960s.By 1981, the complex covered of leasable space, with its 600 tenants accounting for 95% of toy transactions in the United States that year, amounting to $4 billion.The American International Toy Fair, held jointly at the Toy Center and at the Javits Center each February, brings up to 10,000 buyers from the United States and around the world.