Check out Bob's exclusive breaking-news alert that ran on the Chicago Tribune's "Breaking Business" website today that broke the story of Nicholas Pritzker of Chicago's (highly secretive) billionaire Pritzker family listing his 45-acre estate in Covert, Mich. -- complete with a 7,325-square-foot, contemporary-style mansion and 425 feet of frontage along Lake Michigan -- for $4,950,000.