Portland, Ore., builders have turned to ecological roof design to earn extra height on high-rise buildings. A city bonus allows up to 3 square feet of extra floor area for every square foot of eco-roof­. A new building, called The Beacon, is taking full advantage: Its 13-story and nine-story towers will be covered by a total of 6,668 square feet of eco-roof. The roof will use grass, plants and other vegetation to offset roughly 60% of the building's energy consumption, according to a city Bureau of Development Services report.

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