Basement den of a 1950s Hollywood Hills, Los Angeles, home renovated by Christopher Cahill of CASC Design Inc. and The Curator with a large flat screen TV mounted against a black-painted brick wall and above a fireplace, two textured black coffee tables set side by side over a dark Persian rug, a long medium-toned wood bench with textured cream cushions set beneath a large, wall-to-wall window, and medium-toned wood stairs leading up through split-level plan.

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For the lower-level den, “Sean wanted something that felt really cozy,” says Alves. She and Echeverry covered the walls with Portola’s deep-green Timberline limewash and installed a built-in sofa to enclose a retreat from the rest of the open-plan house. They kept the home’s original hardwood floors, layering them with vintage Turkish rugs, and installed recessed shelving after discovering a hidden crawl space behind one of the walls.