Yes, you may audit the class. Audit status cannot be chosen during the telephone registration call. The office is located in the parking structure. No University parking is available at the Water Tower Campus. Students should take public transportation, the University shuttle buses or park in a private lot.
Some discounts are available at lots near the campus.
Parking at the Mallinckrodt campus is free of charge. I'm unfamiliar with the campus. The Schedule of Courses probably has all the information you need. Consult it first to find out where the class will be located and to find a campus map showing you how to find the building. If a classroom has been changed since the printing of the schedule you will find a yellow notice on the original classroom door directing you to the new room.