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404 W. Harrison St.
Old Main Post Office Garage
Affordable parking garage at Chicago's Old Main Post Office in West Loop Gate. Just a quick walk to Chicago Amtrak, Union Station, and Willis Tower.
For Pedestrian Re-entry:
The only exit for the public is the Historic North Lobby where there is 24/7 security guard ready to assist to let the public In/Out through the turnstiles. Customer needs to show ticket or online reservation.
The South lobby exit leading to Harrison street is open until 9PM, while the North lobby leading to Van Buren is open 24/7 by using the far west entrance.