Two or three years after he opened his namesake Chicago-style pizzeria in 1998, Anthony “Rocco” DiGrazia knew he needed more space. “We’ve been too small for a long, long time. We are in our own way,” he said on Thursday, days before he plans to close the original location of his 26-year-old Rocco’s Little Chicago Pizzeria and move to a space nearly three times as big and just a few hundred yards down East Broadway. “If we are busy in the summer, that means we can’t even approach the amount of business we can accommodate in the busy tourist season.”