Hilton Garden Inn Chicago Downtown/Magnificent Mile. 10 East Grand Ave, Chicago, IL 60611. Call 800-Hiltons or direct to the hotel at 312-595-0000 to make reservations. Hilton Garden Inn is located across the street from our offices. Marriott Chicago/Magnificent Mile. 540 N. Michigan Ave, Chicago, IL 60611. Call 312-836-0100 to make reservations.