I am a longtime financial district luncher.
I only go to the (relatively) inexpensive places, so no Les Halles or Roy's for me.
Here is my short list:
Veronica's (Jamaican cart on Front St)
Seh Ja Meh (Korean on John St)
Diwan E Khaas (Indian on Nassau)
Tokyo Kitchen (Japanese (not sushi) on John St)
Sophie's (Cuban on New St- and other locations)
Tajin (Mexican on Greenwich)
Big Al's (Pizza on Thames)
White Horse Tavern (Bar on Stone st)
Adriennes (Pizza on Stone st)
Any other good places I'm missing?