@thor which is in itself a stupid idea – if you earned the money for that mansion, you deserve it. You already provided enough productivity to society to fund it. There's no reason to additionally turn it into a bloody tax to society for it to just exist, maintaining it is enough of a constant cost that generates tax revenue.

Also, forcing people to jump through hoops just to maintain their capital, not even increase it, is how you get increasingly worse attempts at working around the system or abandoning it altogether.