Located in the Pacific Palisades, the original structure (left) had been virtually untouched for over 40 years; architect Kevin Southerland recently renovated it with an eye for preserving its "good bones" and gently updating it with eco-friendly materials. A new layer of painted cement board (right) now coats the exterior, lending it long-term durability and resistance to decay.  Photo 2 of 6 in A Mid-Century Modern Makeover in Los Angeles