W'stemann's plan recalls those that Mies van der Rohe developed in his elegant linear-court house projects of the 1930s and '40s'only here, as the architect puts it, 'much of the program for the house is hidden on the periphery.' Its concrete frame with white plastered masonry infill walls gives it an implacable and impenetrable solidity. Following the outline of the property'a parallelogram in a compact residential area'you might say the 6,200-square-foot house evokes, on a small scale, fortresses such as the nearby 10th-century Moorish Sohail Castle.

The neighbors at first didn't see this historic connection. Since it diverged from the Spanish Mediterranean or classical-style vocabulary typical of Marbella's villas, they asked the client if it was going to be a hotel or a department store. As the owner tells it, they even expressed concern to the local government that the design represented a violation of the residential zoning. No, it was simply a house.

Stepping through the protective entrance behind the thick walls enclosing the site, you are surprised to find yourself in a light-filled living and dining area contained in a glazed bar. It extends the width of the house, stretching from the entrance vestibule on the north to a minimal kitchen on the south wall'so minimal, in fact, that it is hard to find the stove (concealed by a movable counter) or other culinary appurtenances.

Long sliding glass walls open the indoor living spaces to a patio and a small pond immediately to the east, and to a grassy lawn and swimming pool to the west. Looking in this direction, where the house's receding columns and beams frame vistas and define the various interior and exterior areas, you can catch a glimpse of the Sierra Blanca Mountains. As the spaces unfold, boundaries blur between inside and out. 'We just move the furniture outdoors when it gets warmer,' says the client on a 65-degree winter's day. Not all of it moves, however: W'stemann has created nooks with built-in benches and podiums of masonry covered with a smooth cementitious coating'as integrated with the architecture as built-ins are in the habitations of Le Corbusier.

Leaving the living area and walking west to the lawn and garden, you pass through an open court, a spatial void that is the center of the house. Bound on the four sides of the second level by expansive grills of slender precast-concrete brick, the court seems enclosed by modern-day Moorish mashrabiyas, which filter light into the corridors leading to the bedrooms, library, and media room. Where the upper bedroom wing overlooks the lawn, an L-shaped pool, and a lemon grove, W'stemann has carved deep niches, much like the syncopated crenellations of a medieval fort, to provide secluded sunporches for the occupants and guests.

In boiling down the elements of both historic and modern motifs to their essentials, W'stemann avoids obvious replications of any particular style. His unremitting approach to clean details reveals his architectural training at Zurich's rigorous Swiss Federal Institute of Technology. Yet the fact that he has offices in Barcelona as well as Zurich explains his more casual Mediterranean sensibility and underlies the house's subtle combination of control and la buena vida.

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Size: 6,200 square feet

Construction Cost: withheld

Completion date: July 2014