McDonald's followed up its investment in Chipotle with several more moves beyond the burger business. In March 1999 the company bought Aroma Café, a UK chain of 23 upscale coffee and sandwich shops. In July of that year McDonald's added Donatos Pizza, a midwestern chain of 143 pizzerias based in Columbus, Ohio. Donatos had revenues of $120 million in 1997. 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. At the time, there were more than 850 Boston Market outlets, which specialized in home-style meals, with rotisserie chicken the lead menu item. Revenue at Boston Market during 1999 totaled $670 million. McDonald's rounded out its acquisition spree in early 2001 by buying a 33 percent stake in Pret A Manger, an upscale urban-based chain specializing in ready-to-eat sandwiches made on the premises. There were more than 110 Pret shops in the United Kingdom and several more in New York City. Also during 2001, McDonald's sold off Aroma Café and took its McDonald's Japan affiliate public, selling a minority stake through an initial public offering.