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In Seattle, the Bullitt Center (see also page XX) is striving to become the first U.S. commercial office building to earn Full Certification through the Living Building Challenge. Helping achieve its net-zero energy performance goals, the building’s IGUs are triple-paned and weigh up to XX kg (468 lb). Most of these units are 51 mm (2 in.) thick, comprising a spacer and two lites of glass with low-e coating.