Hey MAG,
Oak Park has the fancypants (for OP) Cafe Le Coq (though maybe it's a little too delicate) or Marion Street Grill (upper mid-level chow, nice enough room), or Cucina Paradiso (white tablecloth Italian, a little more stylish) , but I think you might do better going to Forest Park (right next door) to either Jimmy's Place (red sauce Italian bar cum restaurant) or La Piazza (much nicer, higher-end Italian, what you could fairly label "cuisine"). Any of these places could be suitable for a business lunch, and most have sites -- if any in particular catch your interest, I can tell you more.
Hammond
"Don't you ever underestimate the power of a female." Bootsy Collins