[gruez]

>For example in France, 200k empty dwellings are in Paris alone

Source? A quick search only turns a figure half of that: https://www.statista.com/statistics/1290578/number-homes-par...

Also, just because it's "vacant" doesn't mean it can actually be used to house homeless people. It could be undergoing renovations, or on the rental market.

[Ekaros]

10% doesn't seem entirely reasonable. Maybe bit high, but still if the vacancy is because renovation, waiting for new tenants either renters or owners. You want some slack in any market. And ofc, there is some number of second or third properties in cities like Paris. Maybe part of solution would be to ban these and AirBnB entirely. Only allow hotels and like to exist.