Empty real estate buildings used purely as an investment vehicle while the city below suffers a housing, affordability, and homeless crisis.

http://www.vacantnewyork.com/

Henry George predicted that these exact conditions would worsen as societies grow richer, as a product of the economics of land speculation. If you're interested the what Georgism recommends to remedy this crisis and create the conditions for broad prosperity, I strongly recommend checking on this primer:

https://www.astralcodexten.com/p/your-book-review-progress-a...