I agree that zoning laws need to be changed and that corporations need to be restricted from buying houses. And I also think we need a lot more building of housing by both the government and private investment. However l, if you don't think millions of immigrants coming into this country is not causing a major housing crises you are just denying the obvious. When millions of people come into the country legally and not legally they all need housing and this causes a housing crises.

And this housing crisis hurts the poor hardest.

You are just ignoring the obvious.