I am an expert in the rules of falling. The first sign of an old building about to disappear is a snazzy new boundary wall coming up around it. The wall is usually so high that the old building is already invisible. The name announces the character, size and ambition of the new structure that will replace the old building. The old building is wrapped up, like a face under a mask or a hood, for some time.

Source: The Telegraph September 20, 2018 18:22 UTC