Five years in the making, a new contemporary estate in Bel Air might make even Midas jealous. The mythical king with the ability to turn anything he touched into gold would probably feel quite comfortable in the mansion known as “La Fin,” with its gold marble, fixtures and accents. Not to mention the 44-foot chandelier with 50,000 crystals, a 23-foot outdoor LED screen, bar with light-up swings, and the show-stopping entertainment room that could double as Midas’s penthouse.  Somewhere between sublime and ostentatious, the home has just gone on the market at $139 million.