The Council on Tall Buildings and Urban Habitat (CTBUH) has certified the 86.6-m (284-ft), 25-story Ascent building in Milwaukee, Wisconsin, as the tallest mass timber structure in the world in two categories—the tallest timber building overall, and the World’s Tallest Timber-Concrete Hybrid Building. In 2019, CTBUH certified Mjøstårnet in Brumunddal, Norway, as the tallest timber building at 85.4 m (280 ft). …Milwaukee architect Korb & Associates designed Ascent, with New York engineer Thornton Tomasetti providing structural design services. Swinerton Builders was the supplier for the structural timber used in the project. …While Ascent broke ground in August 2020, it took approximately two years of research, testing, planning and collaboration with external stakeholders to get it there. The process has established a model for tall timber projects. It is estimated the use of mass timber for the structural system decreased construction time by approximately 25 percent, compared to a conventionally constructed concrete building of the same scale.