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American Airlines - Midway Airport Chicago, IL 100,000 square foot training center. Amoco Corporation Downers Grove, IL 45,000 square foot earning center MMI Companies, Inc. National Safety Council 100,000 square foot corporate office. National Safety Council Itasca, IL 100,000 square foot corporate office. Towers Perin Chicago, IL 100,000 square foot office. Tribune Company Chicago, IL 110,000 square foot corporate office. |