After doubling as Gotham City in Christopher Nolan's The Dark Knight trilogy and as Metropolis in last year's Man of Steel, Warner Bros. is using the city of Chicago once again for the highly-anticipated Batman v Superman: Dawn of Justice.
Chicago's Fox 32 reports that the production will shift from Detroit to downtown Chicago in early November, with a shoot lasting four or five days, where both Ben Affleck's Batman and Henry Cavill's Superman are said to be "duking it out." The city will be doubling for Metropolis in these scenes, although it isn't known yet if they plan on shooting any Gotham sequences while they're in town as well. The shooting will then shift to surrounding areas of the Windy City for a week and a half.
It isn't known yet which "surrounding areas" of Chicago will be used in Batman v Superman: Dawn of Justice. It's worth noting that when we visited the Man of Steel set back in 2011, the town of Plano, Illinois, which is located outside of Chicago, was used for Clark Kent's hometown of Smallville, so it's possible they may return to that location for Batman v Superman: Dawn of Justice.