Would $20,000 actually be decent compensation for having to move in this case? They'd either have to start paying huge rents locally, or move pretty far away. In the former case, the $20,000 won't last too long, and in the latter case they're being uprooted from their community, they might have to find new jobs. (Or be unable to!)

Certainly it would be a nice thing to do and would ease the blow. And I wouldn't fault the owner for selling. But I don't know if distributing that amount would really make it up to the tenants.