Since relocating to Los Angeles from New York, former Mast Brothers creative director Nathan Warkentin has devoted time to the gut renovation of the Eagle Rock home he shares with his wife and infant son. It was the first time, he says, that he’s had the chance to translate his interest in interiors fully into his own space, which is a 1,500 square-foot study in agreeable contrast: indoor collides with outdoor, antique combines with contemporary, minimalism mingles with warmth.