Make owning more than two homes illegal.

Give current owners/holders of more than 2 homes 20 years to sell any extra homes beyond those two, if they don’t, the extra homes automatically default to state ownership (and then are later sold to disabled, underemployed and low income people at a massive discount.

This would garantee a certain amount of deflation, which could be dolled out by the government as needed whilst resolving the housing crisis.