Source article: http://www.bizjournals.com/sanjose/news/2013/07/19/tesla-buys-big-chunk-of-fremont-land.html (cites Alameda County Clerk Recorder's office)
Derivative article: http://jalopnik.com/tesla-just-bought-a-test-track-next-to-their-factory-840621863
Derivative article: http://jalopnik.com/tesla-just-bought-a-test-track-next-to-their-factory-840621863