Chicago my world...
Chicago also has a very long abandoned underground freight tunnel system (built about 1900) which I have as the site of several villian bases, and the hideout for several hidden refugee paranormal societies. This tunnel system covers most of downtown and was last used to deliver coal and packages in the late 1950's via a small electrical railway. The frieght tunnel system "flooded" about 15 years ago when a piling in the Chciago river was forced through it. It has been repaired. According to the Tribune it is clean, smell free, and creepy quiet. What a great place for monsters to lurk!
Also Chicago has wonderful suburbs. The north shore is very high class and trendy. The south side is more run-down. The western suburbs (I live in Lombard about 20miles due west of downtown) are mostly middle class and full of houses and shopping centers. Of course we have many superhighways (great for chases!).
Our mayor for life Mayor Daley (son of famous mayor, brother to politically connected Billy Daley) runs the city. He recently closed the downtown airport by sending demolition crews in the dead of the night and destroying the main runway! He is quite a character in himself!
The Tribune and Sun Times are the major newspapers. One of my characters has a contact as the society editor of the Tribune! This is a great idea! It allows him to get invites to parties and indirectly know all of the "in crowd".
Chicagoians love to gripe about the city, its politics, the sports teams, and the weather. But most love the city, as do I.