430 N. Michigan Ave., 3rd Floor
Chicago, IL 60611
Toll-free phone: 800.462.8841
If you have general questions and questions about designation email the CRS Customer Services or call 312.321.4400 or 800.462.8841.
The Customer Service Center is open weekdays from 8:45 a.m. to 4:45 p.m. CST.