This is pretty much the same as banning non-resident owners, bit it's formally a punitive tax rate rather than a ban. The problem is still the same problem, re

This is pretty much the same as banning non-resident owners, bit it's formally a punitive tax rate rather than a ban. The problem is still the same problem, rent markets collapse.. so, public housing would have to plug that hole. I think it's important, in the context of public debate, to keep things simple. If an idea approximately transposes into another one... address them as a single idea. I'd catalogue this one under. "Owner-occupancy and public housing only." This is not realistic in most places, but maybe in the context of Berlin it's possible.