The Seattle-Tacoma International Airport C Concourse Expansion added more than 145,000 square feet of new space designed to enhance the traveler experience through improved amenities, dining, retail, inclusive facilities, and public art inspired by the Pacific Northwest. The four-floor expansion features an open atrium, ten dining and retail options, six kiosks, and sustainable design elements including solar panels, all-electric systems, low-flow fixtures, and light-filtering vertical windows. With an estimated cost of $399 million, the project was delivered through the GC/CM method, with Parametrix serving as lead construction manager, and completed ahead of Seattle’s 2026 FIFA World Cup preparations.