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What sort of image comes to mind when you hear the phrase "green architecture"?

If you're like most people, it's a forgettable one. For nearly all of its history, green architecture has been associated in the public imagination with earnest, uninspired designs that put ecological concerns ahead of aesthetic ones. The result is an architectural affliction critics dubbed "eco-banality": houses with misshapen sod roofs or office buildings with solar panels hidden away behind blandly conventional facades.

The gulf between high-design architects and ecologically minded ones has been, more than anything, a matter of divergent priorities. For their part, the leaders of the green-design movement in the 1980s and most of the 1990s paid little if any attention to the high-design or academic sections of the architecture world. Instead, they were determined to pay most of their attention — and perhaps quite rightly, given who makes the decisions about how and where to build in this country — to persuading lawmakers and corporate America that green design was a mainstream pursuit rather than an eccentric or radical one.

The architects most often celebrated in the design media and popular press, meanwhile, especially academics and self-styled members of the avant-garde, wasted few opportunities to denigrate green design. For them, as writer Susannah Hagan put it, green architecture had "no edge, no buzz, no style"; it was not only "populated by the self-righteous and the badly dressed" but "a haven for the untalented, where ethics replace aesthetics and get away with it."

Peter Eisenman, long a member of the architectural vanguard, had this to say on the subject as late as 2001: "To talk to me about sustainability is like talking to me about giving birth. Am I against giving birth? No. But would I like to spend my time doing it? Not really. I'd rather go to a baseball game."

Happily, though, the distance between the two camps has nearly disappeared over the last few years. Green architects are now paying noticeably more attention to style, understanding that without it they'll struggle to build a broad reputation in a design world that is increasingly preoccupied with image. Cutting-edge architects are coming around just as quickly, realizing just how much environmental damage the building trades are responsible for — and, more practically, that clients and building codes are demanding energy efficiency in new construction. The list of architects whose firms are now pursuing sustainability in good faith includes Renzo Piano, Norman Foster, Glenn Murcutt and the Swiss duo Herzog & De Meuron, each of whom has won the Pritzker Prize, the field's highest honor.

Perhaps most important, a new generation of young architects has emerged with little patience for the old enmities between environmentalists and designers; for them, the idea of a contradiction between architectural achievement and ecological progress makes little sense. As a result of these shifts, sustainability is being embraced by the same architects who set the field's stylistic and theoretical agendas.

The new traffic between the realm of green and cutting-edge architecture is particularly notable, and particularly busy these days, in residential design. Since houses are small and self-contained, and often funded by progressive private clients instead of bottom-line-oriented commercial ones, they offer an ideal testing ground for new green strategies.

The most remarkable aspect of sustainable residential design these days is its diversity: of size, type, style and location. Green houses now rise from tightly packed city streets as well as hillsides and rocky seashores. They are single-family dwellings and subsidized apartments, primary residences and weekend getaways. They are sheathed in glass, in bamboo, in synthetic panels made from recycled newspaper. They take their aesthetic cues from primitive dwellings, from organic forms and, significantly, from architectural predecessors who include the founders of the Bauhaus as surely as Thomas Jefferson, Paolo Soleri or Frank Lloyd Wright.

Indeed, it's becoming impossible to ignore how many green houses are being designed in the sleek, ornament-free style that has once again become the prevailing approach among high-end architects, particularly younger ones in America and Europe.

Not surprisingly, Southern California, long home to the architectural cutting edge, especially in residential design, is helping to redefine sustainable design to new heights. Three recent projects in particular suggest the new aesthetic variety, and the new ambition, of green residential architecture.

The largest and most prominent of the three stands near the beach in Santa Monica, its grid of 199 bright blue solar panels glinting in the sun. Colorado Court, a five-story, 44-unit apartment complex that welcomed its first tenants in early 2003, is the first large residential complex in the United States to combine advanced sustainability with low-income housing.

Designed by the Santa Monica firm Pugh + Scarpa, Colorado Court produces enough energy to satisfy 92% of its power needs. And it includes a list of sustainable features as long as any building in America, from age-old gestures like natural ventilation to recycled materials to keeping its tenants within walking or biking distance of their jobs and shopping.

The building's single-residency studio apartments, though small at 300 to 375 square feet, are a bargain by Santa Monica standards, renting for less than $400 a month. Pugh + Scarpa partner Angela Brooks suggests that low-income tenants are precisely the kind of residents whom green architecture ought to be serving — particularly in California, where the utility markets have been prone to huge price upswings in recent years.

"This group of people is the least able to pay for things like water and power," she says. "When utility bills go up, it hurts them much more than others."

From the beginning, it was important to the architects, who work squarely in the Modernist vein, that the building have some architectural panache. In plan, Colorado Court is made of three arms — two long ones on the outside and a shorter one in the center — that reach out to catch the prevailing ocean winds. In elevation, it has a precise, squared-off look, with outdoor hallways connecting the units on each floor. The deep-blue solar panels, made up of 5-inch square receptors, make the building immediately recognizable even from a distance of several hundred yards away. Inside, natural light, breezes and 10-foot ceilings help the units feel open to the outside and less cramped than their square footage might suggest.

Venice architect David Hertz, best known for pioneering the use of a "green" concrete called Syndecrete, hasn't built residential projects at the scale of Colorado Court, but his work has been no less important in suggesting that handsome design and sustainability can be comfortably combined.

A perfect case in point is Hertz's recent addition to his own family's house in Venice, which enlarged it from 2,500 to about 4,400 square feet. Inspired by Indonesian architecture, it is executed in a style that might be called Balinese Modern, with mahogany wood stairs, trellises and other elements complementing exterior walls of concrete.

As a staunch proponent of green design, Hertz thought the mere fact of adding that much space, however much his wife and children seemed to need it, troubling. "There's no getting around the fact that on a purely ecological level 4,400 square feet is a lot of house by most of the world's standards," he says.

His solution was to try to make the house the greenest house of its size he'd ever seen. "I employ green techniques in all my work," he says, "but I've thought of my own house — both the original and now this addition — as a kind of case study, even a working laboratory, for me to live with environmental systems, materials and methodologies."