Where does the displaced person who can't afford market rate go? They could afford it at one point, just their wage increases were dwarfed by housing price increases. All it asks is that landlords have a %cap on how much they can increase their rents each year. It's just not sustainable to displace all your tenants every pop of the housing market. It's not like the landlords property tax gets affected when market value goes up, landlords are encouraged to hold and not build on their properties right now because property tax burden is assessed when you sell or build, doesn't matter what realtors can get for your property or how much you ask from your tenants every month.