The end game is to buy up properties for public and low-income housing.
For example, if landlords cannot evict tenants who refuse to pay rent (while the landlords are still being required to pay property taxes, utilities, and mortgages without any discounts), eventually the buildings will either be abandoned or sold for cheap to progressive non-profit organizations. This is a way to get a foot in the door into areas that would never allow straight-up public housing to be built in their neighborhoods.
That worked real well in Detroit.