The Westin Building Exchange is a major telecommunications hub facility located downtown Seattle, Washington. The building was constructed in 1981 as the Westin Building, housing the corporate offices of Westin Hotels, which was then based in Seattle. It is also home to the Seattle Internet Exchange (SIX) and Pacific Northwest Gigapop's Pacific Wave Exchange. In 2020, real estate investment trust Digital Realty acquired a majority stake in the building and assumed management responsibilities.