(NASDAQ: RDFN) —A Bel Air estate was the most expensive home sale of May, fetching $110 million, according to a new r epo r t from Redfin ( redfin.com ), the technology-powered real estate brokerage. Another Los Angeles home, a Spanish villa in neighboring Holmby Hills, came in second, with a sale price of $57.3 million. All in all, four of last month’s most expensive home sales were in Southern California, four were in coastal Florida, and two were in Manhattan. Four of the homes sold for...