More for Uncledave.
River North b'fast:
--Tempo, a 24 hour Greek diner type place, cash only, corner of Chestnut and State I think. OJ squeezed to order, homemade marmalade and stewed prunes (sometimes you have to ask for these two) with every b'fast. Good pancakes (but synthetic syrup), very good ham carved from the bone, very good home fries. Good assortment of fresh fruit. Owned by relatives of Santorini's. I've tried Lou Mitchell's, and for my money I'll take Tempo.
Not for business dinner:
--Chicago has some grrrrrrrreat Thai food. The Chicago hounds have led me to Thai Ave, and TAC Quick--both in the same league as, although not quite the equal of, Sripraphai in Queens. Only problem is these are not near downtown, although several, like Thai Avenue at Broadway and Argyle, are accessible from the Red Line. If you go, be firm, ask for the the authentic 'Thai' menu at each of these places. Both BYOB.
--The Chicago hounds rave about Little Three Happiness and Ed's Potsticker House in Chinatown--an easy taxi shot from the loop. Many postings here for you to peruse, but haven't yet been yet myself.
Santorini's comment: mea culpa--I've never ordered the roasted whole fish (sense of economy and lack of nearness to salt air). Love the thin sliced shoulder lamb chops by the pound, most all the soups (they rotate daily)and the lentil soup especially; the long stewed string beans, the half broiled chicken (after too many days on the road its pretty much the equal of home cooking!), the bread, and the high end Greek cabernet by the glass or bottle--I think its something like 'Hazimakis'. The combo plate is generally pretty good so long as the place is busy. I like to order one for the table. The loin lamb chops look great, but I'm a big guy and the portion is moderate while the price (and deservedly so) is immoderate.