Monrovia, CA as a stand in for Chicago
Some Chicago street scenes in the movie were filmed on Myrtle Avenue in Monrovia, CA.
One scene started with a close-up shot of Box Jewelers then panned to Segal arriving in and parking his Mustang. (I purchased my wife's wedding ring there in 1972.)
(Also, in another Chicago street scene there were tall So Cal palm trees in the background.)