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Designing construction for sustainability Taking a sustainability approach to an existing building can provide significant payback. New York City's landmark Empire State Building recently completed an extensive retrofit. One task involved replacing all 6,500-plus windows (more than 26,000 glass panels) on-site with high-tech, dual-panel windows, resulting in a net energy savings of $410,000 annually. And all of the building's glass was reused, not thrown into a landfill.
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