Bill Gates, Microsoft co-founder and the world’s second-richest man, took seven years to custom-build Xanadu 2.0, a modern-yet-rustic, high-tech estate valued at $125.5 million. According to luxury website The Pinnacle List, Gates bought the lot in 1998 for $14 million. It’s named after the home of the title character in “Citizen Kane.”
The 66,000-square-foot “smart” complex is built into the side of a hill and looks out over Lake Washington. Electronic pins worn by residents and visitors trigger their personal preferences, like the temperature and lighting of a room or even the art that will appear on high-definition monitors throughout the property. It features a 3,900-square-foot pool building, 2,500-square-foot gym, a 2,100-square-foot library with a dome ceiling, a 2,300-square-foot reception hall, a 6,300-square-foot underground garage and many other amenities.