Ah, true. Reading https://liberal.ca/cstrong/build/ I don't see anything that says these affordable units will be kept off the market, or that ensures they will be rented at affordable rates.
I also think land taxes seem promising, and taxes on uninhabited excess square footage, that are earmarked exclusively for building high quality public housing.
How legal is this kind of activity? Do we not have regulations against CPAC-like activity?