Question: why is it call a building even if it is completely built? 

Answer: Well because a building is never completely built. You are always having to rebuild something when it wears out breaks rots or just doesn't work with your kind of lifestyle.\nIn other words a building is always in the act of changing into something else to be built. It is never finished, if it is to stand for years and centuries it has to always be in a state of repair and that is building it over and over and over.
This question from the Yahoo Q&A forum is categorized in the topic: Business & Finance