Updated 09/07/11 – 4:46 p.m.

CHICAGO (CBS) — Starting Wednesday, downtown Chicago is being transformed into Metropolis, and the Chicago Board of Trade and the Willis Tower reportedly will serve as the offices of the Daily Planet.

As WBBM Newsradio’s Regine Schlesinger reports, in case you haven’t figured it out already, the new “Superman” movie is beginning filming in the Loop.

LISTEN: WBBM Newsradio’s Regine Schlesinger reports

Around downtown for about the next 10 days, signs of filming for “Man of Steel” will be everywhere. Crews have moved to the Loop after wrapping up a month of shooting in and around far west suburban Sugar Grove and Plano.

According to multiple published reports, the movie will film at the Chicago Board of Trade, which will double as the exterior of “The Daily Planet,” the Metropolis newspaper where Clark Kent works. The movie will also film at the Willis Tower, which will serve as the interior of the newspaper.

Amy Adams, who plays Lois Lane, and Laurence Fishburne, who plays “The Daily Planet” editor-in-chief Perry White, were spotted at a parking lot at the Willis Tower set on Wednesday. No sign yet of Henry Cavill, who plays Superman himself.

Unlike the filming of “Transformers 3” last year, which was a huge public spectacle, the “Man of Steel” producers are being very secretive about the plans. They are still referring to the movie by the code name “Autumn Frost.”

But don’t be surprised if you see stars such as Russell Crowe, Kevin Costner or Diane Lane hanging around.

For now, “Man of Steel” is due in theaters in the summer of 2013.