In case you missed the recommendations on facebook, here is the official comments from those in the know as to what buildings to see in Chicago:
The Art Insitute, Opera House, Museums, both the Science & Industry and Field's Museum, Wrigley Building. -per Becky
The Water Tower, Marshall Fields Building, All the buildings on Dearborn, New Trump Tower, take the Architectural Tour on the river, also churches, Presbyterian on Michigan Ave. -per Karen.
Haven't heard from any one else, but these will keep us busy enough, if I ever make it back there again.!