Plus it is the tallest concrete building in the world I think. All other tall buildings are usually steel frame. For this they had to develop new technology for pouring concrete; as the old way of doing it where they mixed it at ground level and pipe it up; wasn't working as the concrete started setting before being poured! Because it is concrete; they were able to get it nicely structured too, as it is easy to shape concrete. Aqua tower is another building that uses this property of concrete. Plus all the offsets in the building reference other buildings in the neighborhood. I hate the TRUMP sign, because of aesthetics. Bad font and the gaps aren't proportional etc. But the building itself is a gem.