PORTLAND, Oregon — The second and final phase of the Portland International Airport (PDX) main terminal expansion is now open. Designed by ZGF for the Port of Portland, the 1 million-square-foot project is the largest public infrastructure project delivered in Oregon’s history. Since phase I opened in 2024, the terminal has received multiple international honors, including the Prix Versailles World’s Most Beautiful Airport award, Fast Company’s Best Design in North America distinction, and recognition from the Holcim Foundation for Sustainable Construction. Featuring a 9-acre mass timber roof, the terminal evokes the feeling of walking through a Pacific Northwest forest. …The $2 billion terminal renovation and expansion is the largest mass timber project of its kind. The Port of Portland and ZGF decided to expand in place, keeping the airport fully operational throughout five years of phased construction. The strategy was made possible, in part, by a prefabricated wood roof that spans the entire terminal.