[W3zzy]

Who's talking about 1900? We have a part in the city that was built in the 1600's. These buildings have thick stone walls that are prone to condensation during the summer. It's easy to deal with when you open a window in the morning or keep the bathroom door open after showering.

These buildings will have ventilation eventually but the code needs about 20 years to take full effect.

Mind you that people have been living in those buildings for hundreds of years without issues but tennants these days don't seem to have the basic skill of airing their place.