via The Wall Street Journal - Estate Sold for $100 Million

Where:  Los Altos Hills, California

Size: 25,500 square feet

Buyer: Yuri Milner,  Russian Investor

A Russian investor has bought a French chateau-style mansion in Silicon Valley for $100 million, marking the highest known price paid for a single family home in the U.S. Yuri Milner is the head of  Digital Sky Technologies and whose investments include Facebook Inc., Groupon Inc. and Zynga Inc.