New Zealand is definitely an example that a lot of international human rights experts tend to draw on. It's a good one.
What I am proposing is, frankly, any sort of disincentivizing action that would stop people from wanting to park their capital in additional investment properties. An incremental tax makes sense. I've been reading tons of articles about folks who own multiple properties and who say themselves that they should be taxed and that there should be more regulation. They're just utilizing a market that has made it easy for them to accrue huge amounts of profit very quickly by leveraging their previous equity and then reinvesting it.
If we genuinely believe in the human right to housing, this is an obvious space to intervene in some way. It could be taxes. It could be some other sort of regulatory measures, but if we truly want every Canadian to have access to housing, we cannot just let a few people hoard wealth and property. Whether that's through a tax or something else is up to you folks.