There a number of smaller restaurants on the north side of Chicago Avenue, west of Rush, for a few blocks. Cheaper, I am sure, quality......unsure.
I only know this because I live in the south suburbs with two daughters and am thus expected to chauffeur them as required to American Girl Place a block east or so every once in a while, and we pass those restaurants on the way from the parking garage over there.
Be sure to do some window shopping at the Bentley dealer a half-block north of Chicago on Rush if you get over that way. Actually Bentleys are in the minority there....they also sell new Saleens, Lambos, Bugattis, and seemed to have as many used exotics of other makers, too.
Try PM'ing randyruiz.......I think he still lives in the John Hancock Center a couple of blocks away and might know if any of those are good, or Billy (bhd812)--either of them would probably direct you to the best choices.