Being from UK: stop multi home ownership for private companies/persons. Move to majority council owned houses, which then feeds money back into the communities. Follow right to buy, where the money goes back to the council.
I think they'd suggest something like: "single family homes cannot be rented, only bought or sold to individuals or families which must live there some minimum percentage of the time."
If zoning codes can make it effectively impossible to build anything but single family homes, we clearly have a legal framework for distinguishing single-family from multi-occupancy apartment buildings. Thus, apply this requirement to single-family homes (or at least homes in single-family zoned areas).
There are a lot of unintended consequences and edge cases to this though, clearly. For example, I live in a building that is "technically" an apartment building right in the middle of nothing but single family homes. You couldn't build an apartment building like this here, now. This is because it was originally a single family home but was converted into a duplex ~100 years ago (2 different electrical services) and has remained a duplex legally ever since. I purchased the land and home jointly with a family member so that each of our families could live in one half of the duplex, which is how we currently live. A home like ours could end up being classified in very different ways depending on the specifics of a law like we're discussing.
Regardless, I still want my home price to crater if it means everyone else I know can buy a home. I hope home prices go down massively and the residential speculative bubble in this country dies a violent death. The only reason we even bought this house was because buying a home cost so much money that we had to buy half a home to make it a possibility. Even if I'm upside down on this house, I'd still rather be stuck paying off the mortgage or going bankrupt than hold everyone else financially hostage. Housing is too important.
The drastic solution is you ban long term rentals - all 'rental agreements' must return shares in the underlying real estate and structure proportional to length of stay. The rent payments would be distributed pro rata to the existing share holders.
Of course you could also allow people to build homes at market clearing prices, so investments would just be undercut.