Here in Austria there's two markets:
1. New buildings that aren't rent controlled, can rent for $1-3k monthly.
2. Alt buildings that are rent controlled and compete with public housing, renting for $400-$700 monthly.
Old/alt buildings sell for at least half the price of new buildings. Around 60% of Vienna's residents live in public housing. I don't think things that work here would ever work in other parts of the world.