The way this is likely to play out is this:
The city will let tenants make complaints about their landlord on whatever.
The city will simply slap fines or other bureaucratic nonsense on those landlords for not doing whatever the tenants demand.
Once the fines, penalties, etc., pile up, the city moves in, seizes the property for lack of payment of the massive fines.
They hand the property to a friendly, but totally incompetent, NGO nonprofit to run, or let the tenants form a union, collective, etc., and run it themselves.
The property devolves into a crime ridden, totally unfit for habitation nightmare in short order.
The city comes in seizes the property again promising to run it better.
The city finds there's neither money nor time to fix the disaster so they put the property on a wait list to fix it as they get money.
The tenants wish the original landlord ran things.
The property ends up abandoned and the city washes their hands of the whole thing.