Gray is a timeless color, but it could also be considered drab if not accessorized with bold colors. Anyone who has grown tired of looking at white paint on walls for years should consider gray tones. Gray paint is cooler than its white counterpart and more versatile, as it manages to blend well with most decorations. It is an ideal color for all interior spaces and provides the perfect backdrop for color bursts.
I never heard of Oak Glen before, but do recognize the mountain names. I wouldn't expect to find any towering Sequoias and Redwoods there because neither species is native to that part of California, and they do take some time to become towering. And I've never heard of any overlapping of their ranges. A more suitable house for this location might get inspiration from the Monolithic Dome in Yucaipa which survived a direct hit from a wildfire.