Sharon Johnston, who runs the Los Angeles firm Johnston Marklee & Associates with her husband Mark Lee, told me a couple of years ago that there was one key difference between their work and the mannered, loosely flamboyant designs of Thom Mayne, Frank Gehry, Eric Owen Moss and other famous L.A. architects a generation or two older.

In developing a design, she said, she was most pleased when she hit upon an architectural gesture that could accomplish two or three goals at the same time -- that could fold several priorities into a single move.

Now that the firm’s design for a new building on the campus of the Menil Collection art museum in Houston has been unveiled, it’s easier to see what she meant.

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It’s also clear that Johnston Marklee, founded in 1998, is poised to break through the malaise that seems to have settled over many midcareer L.A. firms -- in part because of the insistent shadow cast by those famous older architects -- and take on increasingly prominent public work. 

The architects' design for the $40-million Menil Drawing Institute, due to break ground next year and open in 2017, appears very simple at first glance. The flat-roofed, pavilion-like building, wrapped around three courtyards, looks to be a self-effacing white object sliding between -- and even hiding behind -- a group of large oak trees.

But once you take a closer look, it becomes clear that the architecture is not so much spare as it is efficiently layered with ideas and comfortable with contradiction.

The design is a sustained negotiation between public and private spaces. It is dedicated to display and to keeping objects protected or hidden from view.

In some places it opens up to sunlight. Elsewhere it shuns it. Its geometry is simple and complex.

The building will occupy a location on the Menil campus that is now peripheral but soon to be central. Its scale is bigger than a house but smaller than most museum buildings.

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Even the roof, a thin plane of half-inch plate steel that the architects developed with the structural engineer Guy Nordenson, isn’t quite what it seems. From afar the building has a direct and modern silhouette. The design essentially sketches a straight roofline floating atop the landscape.

But inside its main gathering and circulation space -- a part of the building the architects call the Living Room -- is a faceted ceiling that looks from certain angles like a pitched roof.

The architects have smuggled a gable inside the building.

And that ceiling, true to Johnston’s word, accomplishes a number of architectural goals at once. The gabled form recalls the small bungalows that the Menil has acquired in recent years on the perimeter of its campus and painted a matching shade of "Menil gray." It reduces the scale of a room that the architects want to feel approachable, even explicitly domestic.

It hints at the fact that drawings occupy much the same place in the art world that houses (and other compact single-story buildings, like this one) do in architecture, as a locus of experimentation.

And it suggests that complex geometry -- or strong form-making more broadly -- is not something Johnston Marklee is incapable of or uninterested in doing but rather something it wants to deliver in measured, concentrated doses.

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The Drawing Institute, according to the Menil, is the first ground-up building in the United States dedicated to modern and contemporary drawings. Johnston Marklee was selected to design it after an unusually well-run competition that also included London architect David Chipperfield, the prominent Tokyo firm SANAA and Mexico City’s Tatiana Bilbao.

The new building, with a total of 30,000 square feet on two floors, one of them below ground, will be located near the southern edge of the Menil campus. It will be adjacent to the 1995 Cy Twombly Pavilion, designed by Renzo Piano, and a short walk from Piano’s main building for the museum, which was completed in 1987 and remains the Italian architect’s best museum project in the U.S. by a significant margin.