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Top 10 green buildings

May 20, 2010, 2:39 p.m.
rooftop with fire pit, seating

Photo: Eckert & Eckert

11 of 12

Twelve|West, Portland, Ore.

Rising 23 stories above the intersection of Twelfth and [skipwords]Washington[/skipwords] streets in Southwest Portland, Twelve|West is a mixed-use building designed with sustainability and ongoing learning as integral goals. Twelve|West was designed to achieve the highest levels of urban sustainability, and is expected to earn a Platinum rating under LEED NC overall and LEED CI for the office floors. An emphasis was put on selecting low-impact materials, including salvage, reclaimed and FSC-certified wood. Much of the concrete building structure is exposed on the interior, minimizing the use of finish material and providing ample thermal mass. Energy use reduction was a primary driver of the design. Simulations predict energy savings of 45 percent over a baseline code building. (Zimmer Gunsul Frasca Architects LLP)