A ROOF FALL ABOVE THE ANCHORAGE OCCURREED AT 39 WALL ON 3-NORTH # 2 BELTLINE WHICH AFFECTED VENTILATION ON THE BELTLINE. THERE WERE NO INJURIES & THERE WAS NO ENTRAPMENT. THE FALL OCCURRED IN THE INTERSECTION AT 39 WALL & WAS APPROX. 25 FT. LONG BY 20 FT. WIDE AND 15 FEET ABOVE THE ROOF LINE.