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A cedar screen adds an openness to the staircase.

The previous owners had created the duplex by linking two apartments with a spiral staircase. A pendant lamp by Muuto now overlooks the staircase, which has been reinvigorated with a new birch plywood surround. The material is a unifying motif: The shelves and cabinets designed by Delaunay, including those in the kitchen, are made of it.

The Leroy Setziol front door now hangs in a place of honor in the living room, across from the piece by his daughter. The new flooring is walnut, and the stairs were redesigned in fir and walnut.

The partial basement holds storage and an entertainment room. A skylight over the stairs floods the area with natural light.

The stairs and guard rail are made of Ash. Vertical beams are connected to the white, steel substructure with hex-head screws that have been concealed with putty—a simple technique that makes a strong impact. “There are barely any other decorative elements in the interior space,” explains Sonja. “It is all about the play of forms, plans, surfaces, and the patterns of the different wooden coatings under the light.”

The underwater pool window not only adds a touch of whimsy, but helps illuminate the basement.

Large windows and skylights provide ample natural light which is reflected off the larch interiors and white ceilings.