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Corps and foreign investors shouldn't be able to own housing (multi unit should be co-op/market rate nonprofits)
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Individuals should not be able to own more than 5 homes. (The number is semi arbitrary, but at a certain point it is very clearly hoarding, and therefore shouldn't be allowed)
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AirBNB and similar should be heavily regulated. (They turn permanent residences into short term, which reduces capacity, and drives up prices all around)
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Shift to a land value tax system as the primary means of tax collection. What few landlords/scalpers exist after the above changes will have even less room to breathe. And it would punish vacancy, which would put pressure to keep as much housing available as possible.
There may need to be some exceptions. But if changes like this were to occur, we wouldn't have this problem.