I am wondering what protects normal people. I hear a proposal what prevents the ultra wealthy from hoarding, but I am not seeing how this doesn't negatively impact normal, single family residences.

It seems the goal is maximizing tax revenue, punishing hoarders of land, and pushing for communal living. The exact case I think it is imperative to avoid is removing the elderly (cough, less useful) from their forever home in the guise of progress.