Its a beautiful building, but I sure has heck wouldn't work on top of it. Hope the UAE has good relations with the crazies, cause they would get a kick out of knocking something like that down if they got half a chance.
I'm pretty sure the jihadists hate the UAE almost as much as they hate us.
Rule of thumb, falling more than 40 feet (four ZERO feet), and you are dead. vSoooo. what's the difference if you are on the fourth floor of Macy's, or the 140th floor of any other building. Your drop velocity will be the same. And when you hit the ground, there will be the same repercussion.