Sizing up the homes of Bill Gates and other top members of the new Forbes 400 list

Surprise, Bill Gates, with a net worth of $81 billion, is ranked No. 1 for the 23rd year running

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Meanwhile, his friend Warren Buffett fell to third place for the first time in 15 years with a net worth of $65.5 billion

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Mr. Bezos, 52, in the process of building his e-commerce empire, scooped up a vast amount of real properties over the years, earning him the No. 26 spot

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Mr. Gates, 60, spends most of his time at his 66,000-square-foot Medina, Washington, mansion, nicknamed Xanadu 2.0

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Although the shrewdest investor on earth holds multiple real estate investments, Mr. Buffett, 86, is known for living humbly

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The youngest richest entrepreneur docks most of his wealth in schools, health and other philanthropies

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Oracle executive chairman Larry Ellison, 72, has an extensive real estate portfolio. He has bought up large parts of whole neighborhoods in Malibu

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