Chicago is blessed to have many authentic art deco and art moderne buildings. It even has a society and a magazine for these sorts of things.
There's enough art deco and art moderne in Chicago that it squishes out of the Loop and into buildings in neighborhoods all around the city. One of my favorites is just north of Division Street.
The Fisher Studio Houses are crammed between a CVS/Pharmacy and a residential skyscraper, but manages to hold their own against these indignities.
The building at 1209 North State Parkway is actually a group of residences that share a courtyard. It's a wonderful architectural expression, and a textbook example of art moderne. If your friends don't know what the term means, take them here and they will understand.