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The Oregon Convention Center in Portland opened April 18, doubled in size. It now ranks as the largest center in the Pacific Northwest, with 255,000 square feet of exhibit space, two ballrooms, and 50 meeting rooms. As befits its Northwest setting, the expansion was built with environmental concerns in mind: More than a quarter of all building materials are made from recycled material. Runoff from the roof is collected into the park-like Rain Garden, where it is cooled and filtered before returning to the nearby Willamette River.
