JOHN ARRILLAGA

$2.5

BILLION  SELF-MADE SCORE: ( SOURCE: REAL ESTATE AGE: 82 RESIDENCE: PORTOLA VALLEY, CA PHILANTHROPY SCORE: He and his business partner Richard Peery (No. 306) started their Silicon Valley real estate firm Peery-Arrillaga by buying up farmland in the 1960s; tenants now include Facebook and Google. They sold several buildings in Mountain View to Google for $250 million in April and are now looking to develop a residential and commercial project near Sacramento. As an undergraduate at Stanford, Arrillaga worked six jobs—including delivering mail and gardening—just to get by, despite having a basketball scholarship.