The Denver Union Station Transit Improvements project transformed 20 acres of blighted former rail yards into the vibrant centerpiece of a bustling downtown Denver, anchoring and facilitating connections between the region’s transit system with all modes of public transit: an iconic, eight-track commuter rail train hall; new light rail station; and an airy, airport-like underground bus concourse with 22 bays for regional and commercial bus service. At $374.8 million and spanning 20 acres and seven city blocks, it was the largest multimodal project to seek LEED Silver certification from the USGBC. The project was a Public-Private Partnership (P3) successfully delivered under a design-build contract model, requiring intensive collaboration and deep trust among the owner, architect and contractor on a public project.