I'm close to ORD so normally rent cars out of there, but sometimes their rates are out of hand so I'll try National's downtown Chicago location. It is very close to the El's Clark/Lake stop so I can take the Blue line from ORD (or Rosemont or Cumberland) downtown I'm right there. The office has limited hours and are usually closed on holidays. Sun 09:00 am 05:00 pm Mon-Fri 07:00 am 08:00 pm Sat 07:30 am 03:30 pm There obviously isn't the selection as there is at the airport locations, I wouldn't expect a huge upgrade here. I've rarely seen higher end cars here. as stated the rates can sometimes be much better at this location and also the taxes are not as bad as the Chicago airport locations.