An urban environment is a living organism. Overdevelopment causes degeneration, the most visible manifestation of which is the gradual dilapidation of buildings and concomitant issues such as public order, public health, and fire hazard problems that menace people's life and property.
都市環境自有其生命，發展到達極致，退化也隨之而來，最明顯可見的即是建築物日漸破敗，以及衍生的治安、衛生和消防等直接危害居民生命與財產的問題。