Studies suggest that up to a quarter of the buildings that are rated under Leadership in Energy and Environmental Design for New Construction guidelines are substantially less efficient than they were intended to be, writes Mark Winder. Now the U.S. Green Building Council is asking certified buildings to submit 5-year performance reviews in order to maintain their certification. "[B]uilding operators who wish to remain on top of the market need to document their continuing efforts toward the objectives of sustainability," Winder writes.

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