Ruby of Siam is pretty much across the street, more than decent Thai.
If you want to eat at Old Orchard, the Bagel provides pretty good (though pricey) deli, and I still like California Pizza Kitchen there too, but there are folks who sneer at it.
EJ's Place I haven't been to for a while, but it's pretty good faux diner experience, just north of Old Orchard.
A couple blocks east on Golf is Charcoal Oven, it's a step back into the 60's supper clubs. Great friendly service.
All those are walking distance from the theater, and there's lots more.
What is patriotism, but the love of good things we ate in our childhood?
-- Lin Yutang