In current market, owning dozens of properties is not a good investment. Owning thousands is. And, in my opinion, which does not mean much, is one of the problems. I have a friend living somewhere in the UK. He wants to buy an apartment. He has the conditions for it, but he cannot because every single building in his city belongs to the same company who keeps them to inflate the prices.

Why there is no exponential taxes for owning that many properties after they are finished?