Contact Us Corporate Headquarters: OEC Business Interiors 900 North Church Road Elmhurst, IL 60126 Phone: (630) 589-5500 Fax: (630) 589-5637 Driving Directions Business Hours: 8:30 am-5:00 PM (Mon.-Fri.) Chicago Sales Office: OEC Business Interiors 205 West Wacker Drive Suite 800 Chicago, IL 60606 Phone: (312) 364-5611 Fax: (312) 364-5637 Driving Directions Business Hours: 8:30 am-5:00 PM (Mon.-Fri.) Click On a Star to get more Detailed Location