A sold sticker is displayed on a for sale sign outside of a home in Palo Alto, California, U.S., on Wednesday, June 8, 2011. Silicon Valley property booms start in Palo Alto, which is adjacent to the Stanford University campus, and Cupertino, home of Apple Corp., because of those institutional links and the areas' coveted public schools, said economist Stephen Levy. Photographer: David Paul Morris/Bloomberg
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