752 feet above the ground. it means the top of the building might have been obscured. >> yeah, i think that's absolutely right. and for geography purposes let's remind the audience as well the midtown heliport is not that far away. and we don't know the answer to this -- was this chopper trying to get to or was it coming from the midtown heliport on the east river and did that play a role? given the low ceiling and the fact the helicopter was not supposed to be -- unless it had permission -- not supposed to be over midtown, was there some disorientation involved there, did the pilot lose track of where he was? that will be a question for investigators. atc, here are the rules we believe for helicopters over the area. they can fly in visual flight corridors where they can talk to