The Westin Resort Hotel is an all–precast concrete building that emulates flat-slab, post-tensioned construction. Constructed in Avon, Colo., about 100 mi (160 km) west of Denver, Colo., the project demonstrates that a precast concrete alternative can be constructed in winter conditions on a confined site. The building was completed two weeks ahead of schedule using four basic precast concrete components: elevator and stair cores, columns with integral capitals, beam slabs, and rib slabs. About 3700 precast concrete pieces were required to complete the project. This paper describes the structural concept, alternative details, fabrication, and construction of the building project.