Midcentury architect John Lautner's Harpel house in the Hollywood Hills was written off by some preservationists after previous owners added a second story and installed stucco walls, track lighting, aluminum window frames and other features ill-suited for the 1956 design. After two years of renovation, however, current owner Mark Haddawy has revived Lautner's original vision, peeling away misguided additions and studiously re-creating the architect's light fixtures, doorknobs and other details.