crazybrit: Yes, but there’s no Yichud when you get in. And elevators break down so rarely that that would be a complete Ones, not a P’shia of any sort.
ziplock: Actually, in the T’shuvah R’ Moshe says B’feirush that even the tallest elevator in the world (which at the time was the ESB) isn’t long enough for a Shiur Yichud. So yes, maybe if a Jew could get in to Dubai then taking an express elevator to the top of the Burj might be Yichud. But probably not, because you’d be dead before you got there anyway.