I want to take a basic Economics course (macro) at a college in
downtown Chicago (either a 2- or 4-year university is fine).  Also, I
am not enrolled in a degree program, so I need information on classes
(preferably evening classes) that people may take a la carte--some
schools refer to this as continuing education or student-at-large
programs.  Thanks.

Although not in Chicago, COD (College of DuPage) offers a Macro and
Micro Econ classes.  Classes are available in remote campuses, in the
evening and online. You can take just the one class and don't have to
have a plan or enrolled in any other classes. Hope this helps...

The University of Chicago's Graduate School of Business has produced a
large number of Nobel Prize winners in Economics in the past 20 years.
 It also has
an excellent downtown facility and a large number of students start
part-time in the program (including me -- way back last century):
http://gsb.uchicago.edu/parttime/index.aspx

Best regards,

Omnivorous-GA

Loyola University has a downtown campus (Water Tower), and most of
their Econ courses are taught at that campus.  They frequently have
night classes their, as well.