Estimated home value: $116.2 million
Title: Co-founder, Microsoft; Chairman, Vulcan
Microsoft co-founder Paul Allen owns homes in Malibu, New York, and St. Jean Cap-Ferrat, France, but perhaps the most magnificent of his estates is the one on Mercer Island, Washington, close to where he grew up. Allen owns not just one, but nine homes on eleven parcels of land on the island near Seattle, according to the King County Department of Assessments.
Allen mainly occupies one of the homes. The others are occupied by family members or reserved for guests. The homes come with some pretty fantastic features, including a floating helipad, an NBA regulation-sized basketball court, an enormous fitness center, a ballroom, a gorgeous swimming pool with a waterslide, and thousands of square feet of water frontage.
According to the King County public assessor records, Allen's Mercer Island properties are valued at $38.9 million, $26.7 million, $21.3 million, $20.2 million, $2.8 million, $1.8 million, $1.5 million, $1.2 million, $847,000, $650,000, and $283,000, totalling about $116.2 million.
To estimate the approximate current value of the homes, we looked at recent sales and public assessors' records, and we spoke to expert realtors and appraisers in these homes' markets.