Limited lunch options in the area? Really?
Walk east on Jackson from Dearborn and you'll find plenty of decent lunch options that are not national chains. They include (in the order you'll encounter them) Chicken Planet, Lai-Lai Oriental/Korean Express, La Cocina, Fontano's, and Tokyo Lunch Boxes. Oh and the pseudo-Berghoff reincarnation a block north on Adams is actually pretty good.
P.S. None of these places are worth a special trip, but if you're already working in the area, they're good enough for lunch.
Chicken Planet
21 W Jackson Blvd
Chicago, IL 60604
(312) 360-1409
Lai Lai Oriental/Korean Express
15 W Jackson Blvd
Chicago, IL 60604
La Cocina Mexican Grill
11 W Jackson Blvd
Chicago, IL 60604
(312) 427-2094
Fontano's Subs
20 E Jackson Blvd
Chicago, IL 60604
(312) 663-3061
Tokyo Lunch Boxes
60 E Jackson Blvd
Chicago, IL, 60604
(312) 360-1555
Berghoff Cafe
17 W Adams St
Chicago, IL 60603
(312) 427-7399