Right across from the convention center. It's not gourmet and it's not even very authentic NY style pizza, but it's relatively quick, inexpensive, and decent enough. Think 1980s mall food court pizza and you've got the picture. My cheese pizza was above average and so were the garlic knots. The service is mostly friendly and moves the line quickly. If there's any fault, it's the lack of any artificial sweeteners for the unsweet tea.
But for a quick lunch near the convention center, you can do a heck of a lot worse.