(Bloomberg Businessweek) -- Stephen Starr is one of the most powerful restaurateurs in America today, with an empire that ranges from D.C.’s political hangout Le Diplomate to the neighborhood-making Buddakan and high-styled Le Coucou in New York. Bloomberg Pursuits’ food editor Kate Krader sat down with the former music promoter-turned-dining room hitmaker to find out the key questions to ask yourself if you’re looking to open your o...