Daisy the cow almost certainly did not start the Great Chicago Fire. But that has not stopped as many as 50 people per week from calling a Chicago real estate agent — they’re curious about a mansion he is selling that he says was built for Catherine O’Leary, the troublemaking cow’s owner. The language in the listing for the 6,270-square-foot, four-story Englewood mansion at 726 W. Garfield Boulevard does not exactly lend itself to myth...