[KUcxrAVrtI]

Honestly, seems like a bad idea.

If the rich are willing to pay a premium for the top floors of a building forcing them to share the building with the poor will make them just build their own.

Better yet, have incredibly punitive taxation for this so it becomes even more of a social symbol. Then use that money to improve the lives of people living in the lower floors instead of doing meaningless gestures.