What is your solution? Have internal passports? Government owned housing? Price controls?
Tax housing income as normal income. Remove 1031b exchange. Remove depreciation of homes. Tax all housing sale gains.
Housing would then be affordable.
And by proportional I mean like income tax, so the first $1m is 0%, $1m - $3m is 1%, etc
Not sure the best numbers but should be something were most people dont pay, even can have an investment property to cover need for a rental market, but if you have significant holdings it kicks in, and people with residential empires should basically be untenable unless it is short term holding to renovate etc.
Also could apply top rates to residential property with corporate or foreign ownership so residential is for people to live in.