The Living Building Challenge (LBC)— designed by the International Living Future Institute (ILFI)—is considered to be the world's most rigorous green-building standard. The LBC is organized into seven performance areas called Petals: Place, Water, Energy, Health & Happiness, Materials, Equity, and Beauty. Each Petal is then subdivided into Imperatives, which set specific objectives within those categories. The "Desert Rain" compound was the first house to achieve all 20 Imperatives as required by the LBC.
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