With limited natural light, the challenge for this three-story vacation townhome—nestled into the Ketchum, ID, mountainside—was to create a warm, modern interior that would integrate with the existing stone-clad regional architecture. For warmth in both look and feel, the main level features articulated radiant-heated concrete floors with inlaid stones, fossils, and copper strips. The fireplace hearths in the Great Room and Master Bedrooms were site-cast using the CHENG Geocrete finish method, while some fireplace surrounds were made with pre-cast concrete panels that feature a “wood-board” effect creating a textured, three-dimensional…