Which needs to increase Is the property tax for owning multiple properties, but I'm adraid it would be at this point too late anyway as it will be pushed in big part in already owned properties for rent And without much alternative people Will pay it. Only thing that could imo work would be tax expenses you could write off if you would rent a house for some average rent Price in the Area which would be set up by the municipality.

Add investment renting as the taxes for owning (one, but even multiple) houses/realities Is basically nothing, so it was one of the most Safe And solid investments with low interest rates in last decade.

Talking about Czechia.