Bay Area single-family home prices hit a record high last month, reaching $750,000 for the nine-county region, according to CoreLogic, the Irvine-based real estate information services firm. That marked a 7.1 percent increase from a year ago and surpassed the Bay Area’s previous record of $738,500, set nearly nine years ago. “Job growth and low mortgage rates are continuing to fuel a healthy demand” for homes, said Andrew LePage, a research analyst for CoreLogic, in a report