Ban corporate ownership of single family home and plexes. If they want to rent something out, they can buy/build appartment complexes. If a corporation is found to dodge the ban through a citizen proxy, crackdown hard. After multiple infractions, seize the home.
Change zoning laws to allow denser housing.
Crackdown hard on short term rental.
Build more public housing. Simple, clean and basic housing.
It is a tragedy not a crisis as Vancouver, BC and Canada could easily solve it by building a lot more homes, some public.