Old houses in the city. And some old neighborhoods. The final outcome is demolition. Then re-plan this place and build a new residential or commercial area. You can't transform these old houses and communities. The foundation of the old house. And walls. As time goes on, it will basically collapse. You can't change it. So we must tear it down and rebuild it.

In the process of demolition and reconstruction, there may be some economic disputes, such as developers wanting to pay less. The residents of the old house want more money. In short, it is entangled in economic interests.