With architect Noah Walker, principal of the Los Angeles–based Walker Workshop Design Build, homeowner Nathan Frankel has created a guesthouse high in a Beverly Hills canyon, featuring a living room that doubles as an 80-seat concert hall. The new volume houses the dining area, which includes stairs to the bedrooms. The table is from Blake Avenue and the walnut chairs are from Room & Board. "You don’t want bright colors to take away from that relationship between the interior and the exterior," Walker says.