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 

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

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 

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

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

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

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