Named after the pleasure palace in Citizen Kane, Gates's roughly 66,000-square-foot compound reportedly includes a 2,500-square-foot library, a trampoline room with a 20-foot ceiling, and an early custom home-automation system.
The automation adjusts lighting and temperature as guests move through the house — futuristic for its time and still notable decades later.
Construction alone reportedly ran about $127 million in the late 1990s, and the estate's current market value is estimated well above that today.
The man who built the software empire also built one of software money's most expensive physical monuments.
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