Property estimations are going up in the ultra-extravagance market. Of the 20 Most Expensive Homes In The World possessed by individuals from the FORBES Billionaires List, just six were estimated at not exactly $100 million. A few either exchanged hands or gloat a surveyed quality at more than twice that figure. The minimum costly of these ultra-pricey homes exchanged hands for $88 million. FORBES tallies down the Top 20.