10. 16 empty mansions out of 66
Although most of us are not aware of this, but leaving a property empty for years, especially large estates of this kind, could actually be beneficial for billionaires. If an owner leaves such large properties empty for years, he actually gets certain tax concessions on them. In the UK, properties that are left unattended for more than two years qualify for reduced renovation costs. And the cherry on the cake is if the structure if leveled and newly built, there is no absolutely VAT rate on building costs.