It is possible to distinguish between home occupiers and renters, and were a law made like this some method of distinction would be needed.

The entire purpose of a law like this would be to force renters to keep their lots occupied or sell them if they cannot afford to do so. Either way, you either see a drop in rent costs from a market increase, or you see a drop in real estate costs as the market increases. And either way you do not have tens of thousands of vacant homes while homelessness is on the rise.