Then it becomes cheaper, and the middle class can afford to come back. People like living in dense areas near other people. Walkability, a multitude of restaur

Then it becomes cheaper, and the middle class can afford to come back. People like living in dense areas near other people. Walkability, a multitude of restaurants and cultural institutions, etc. Unfortunately there is a limited amount of it so the rich take it, and the middle class struggle, and it becomes undesirable, and cheap then the middle class can move back. Repeat.