Exterior view of a $100 million mansion in Los Altos Hills, Calif., Thursday, March 31, 2011. A Russian billionaire investor has purchased a lavish, 25,500-square-foot mansion in Silicon Valley for ... more 
Exterior view of a $100 million mansion in Los Altos Hills, Calif., Thursday, March 31, 2011. A Russian billionaire investor has purchased a lavish, 25,500-square-foot mansion in Silicon Valley for $100 million, believed to be the most ever paid for a single-family home in the United States. The Wall Street Journal reports that 49-year-old Yuri Milner, an investor in Facebook, Groupon and Zynga, has no immediate plans to move into the home. less 
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Associated Press | Photo By Paul Sakuma
Thu, Mar 31, 2011 6:17 PM EDT