Parker says the Green party and NDP in Ontario and nationally have put forward practical solutions to tackle different aspects of housing and why it's become unaffordable, including building non-profit housing on public lands, implementing vacant home taxes and using inclusionary zoning, which require private developers to include a certain percentage of affordable units within new, multi-unit housing developments.
Those all sound fine. The article doesn't dig too deeply into what those solutions would actually look like, but I don't think anyone would disagree that starting with them is a good idea.
Inclusionary zoning is interesting. The City of Ottawa has been doing that for a while (not really, but there are affordability requirements that builders will agree to in order to get zoning exemptions), and I haven't seen any stats or anecdotes saying it makes a difference or helps anyone.
Maybe they exist and I missed them. I hope that's the case.