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The nickname actually comes from the title character’s estate in Citizen Kane. It cost $63 million to construct and took 7 years to build. In 2009, the total value of the home and property was $147.5 million. The Xanadu has a modern design in the Pacific Lodge style. It has a large library with a domed roof and an oculus. An oculus is a round window at the top of a dome.
The mansion boasts heated floors and a heated driveway. Guests are given buttons that upon entering a room will adjust the temperature, music, and lighting of the room to suit the guest’s preferences. No telling what happens when several guests enter a room, though.
(Source)