dinner near Beacon Theater
What sort of food/atmosphere/price range are you looking for?
If you're looking for a great meal, with a price tag to match, I'd recommend Compass on 70th between West End and Amsterdam. If you're looking for a tasty steak in an unexpected environment you could try the Fairway Cafe above Fairway supermarkets (on Broadway between 75th and 74th). For Latin food in a fun environment, there's Calle Ocho on Columbus between 82nd and 83rd. For a great wine bar that also serves food, I would suggest Bin71 on Columbus and 71st. For italian that is like Grandma (if she were italian) would make, go to Celeste on Amsterdam and 83rd.
If you have any particular cuisine or price range in mind, let me know and I can brainstorm other ideas for you!