 In 1999, McDonald's 25,000th unit opened, Greenberg took on the additional post of chairman, and Jim Cantalupo was named company president.Cantalupo, who had joined the company as controller in 1974 and later became head of McDonald's International, had been vice-chairman, a position he retained.In May 2000 McDonald's completed its largest acquisition yet, buying the bankrupt Boston Market chain for $173.5 million in cash and debt.