Not too tagntial to the story, but what if, they had to tear it down? In fact, some of skyscraper buildings may require reconstruction / rebuild for whatever re

Not too tagntial to the story, but what if, they had to tear it down? In fact, some of skyscraper buildings may require reconstruction / rebuild for whatever reason one century from now. Assuming the world is at least as dense today's, how are they going to tear it down? Vagas's method works fine because those casino buildings are pretty low profile compare to skyscraper, plus between building and building there is always some open space gap, unlike in the busy NY. We know from 9/11 the force is too great to contain.