LEED certification is gaining speed, even if only a fraction of U.S. buildings have qualified. The total inventory of LEED-certified buildings is 4,825. "We're at a fraction of a percent of the built environment," said Scot Horst, Green Building Council senior vice president. Still, some green-building advocates say that developers are increasingly seeing LEED certification as a necessity to attract tenants or buyers -- not a luxury.

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