The Empire State Building gets an Art Deco–inspired restaurant on the ground floor, decked out in chrome and serving an American menu including Berkshire pork chops atop stone-ground grits and an assortment of oysters (Caraquet Bay, Olympia).
I work in the ESB and came here for restaurant week one year for the lunch special. Usually I try and avoid eating in midtown because it's overpriced and gross BUT this place was really good. It's never too busy, and they move pretty quickly as most lunch places in midtown do so I would definitely suggest coming here for a nice break from your office routine.