A Wall Street Journal story about modern additions highlights one by Mark McInturff to the Stein-Miller House in Potomac. I think I have driven by this house in the Timberwood of Potomac neighborhood. The original house looks like an early 1970s Matthews and Schwartz model near this one (since sold) that combines modern and traditional architecture. The house has a lot glass, including clerestory windows, and mid-century style colored panels on the exterior. It also has a center hall layout and traditional roof line. The addition of glass, corrugated metal and mahogany addition kind of looks like a robot attacking the original house (sorry), but the interior space looks very cool. See images here.