Dinner near Beacon Theater (74th & Broadway)
You will have a lot more options if you are willing to walk several blocks north or south of the Beacon. Especially if you go down to the Lincoln Center area.
Salumeria Rosi - their OpenTable Page indicates they'll take a reservation up to 11pm
Nice Matin - open until midnight
Boulud Sud - until 11:30pm
Bar Boulud - open until midnight
The Smith - 1am