Portland's Platinum high-rise: Oregon architects also are promoting sustainable design in Denver.

• Author: Cote, Mike
• Position: COTE'S [colorado]

On a Sunday night in Portland, Ore., people stream in and out of the lobby of Twelve West, a 23-story building that serves as headquarters for Zimmer Gunsul Frasca Architects. It seems like something special is going on--why else would twentysomethings be streaming in and out of an office building on a weekend?

At Twelve West, however, nothing is unusual about this scene. The young woman stepping outside to walk her French bulldog lives here. So do the people entering through the doors near the ZGF nameplate, unless they happen to be dining at the trendy restaurant on the first floor.

I discovered Twelve West by accident in September while wandering several blocks from The Nines hotel on my first night in Portland during the Denver Metro Chamber Foundation's Leadership Exchange trip. I wanted to know what occupied that high-rise with the four wind turbines spinning atop the roof, especially since Portland is the U.S. home for Vestas, the wind energy company building its manufacturing operations in Colorado.

What I found was not the home of Vestas but a mixed-used building constructed to "Platinum" standards under Leadership in Energy and Environmental Design. Twelve West--ranked among the 2010 Top Ten Green Projects by the American Institute of Architects--features such LEED energy-saving measures as natural daylighting, underfloor air, and radiant heating and cooling. The wind turbines on the roof produce about 1 percent of the building's energy. Solar thermal panels heat 24 percent of the hot water used.

"This is a building where the aspirations we had as a tenant were high," Bob Packard, managing partner at ZGF, told me after a social gathering of business leaders the next day. "The developer that was involved wanted to make it a special building, and the rest of the investment group wanted to make it a special building."

Architects at ZGF wanted to work in a neighborhood that was 24/7, not in an office complex that shut down at 5 o'clock, Packard said: "The mix of uses in the building was a part of the way to make that happen, in addition to being in a neighborhood that is a real neighborhood, not just an office neighborhood."

Portland prides itself on promoting the use of bikes, light rail, street cars and other forms of alternative transportation. More than half of ZGF's 250 employees leave their cars at...