Comment by giantg2

It's an illegal operation. Under that sort of restriction, any building occupied would either need to be occupied by the registered owner or have a registered lease. If those aren't found, the people are evicted. The point is to ensure that everyone knows that you need to have a registered document to stay somewhere so nobody takes those deals. Then on the landlord side, you need to enforce substantial fines for any that have offered unofficial leases and surveillance for property owners that have repeat offenses - both to protect the owner from repeated squating and also to catch any owner bypassing the law.