Many of the office buildings downtown (and this probably true of the 'burbs as well) have small restaurants or snack bars that serve principally the "captive" clientele from the floors above, people who can't get away from their desks for more than a few minutes. People from outside the building don't know they exist, as their advertising usually consists of, at most, a small sign in the lobby.
Most of what they offer is pretty predictable--routine sandwiches and salads. But once in a while they'll have something remarkable. A really good burger or soup or, since many of them are owned by Koreans or Latinos, occasionally something ethnic.
Anything good in YOUR building?