I would like to see a tax on third properties and above that sit vacant for more than 6 months a year then 10% of the property value as a fine which would go to a ministry supporting unhoused people.

There would probably have to be some provision that if the property is rented out then for tax purposes the rent must be considered at the market rate -15% at the time the agreement was made. Eg a corpo couldn’t rent a bunch of units to a subsidiarity and call them occupied since they are rented arrive they would have to pay income tax on the income.