St. Regis Museum Tower is a highrise in the South of Market district of San Francisco, California, adjacent to Yerba Buena Gardens, Moscone Center, PacBell Building and the San Francisco Museum of Modern Art. The 42-storey, 484 ft (148 m) tower is bounded by Mission Street, 3rd Streets and is operated by Starwood Hotels & Resorts Worldwide. The hotel recently attained five-star status.
The tower was designed by Skidmore, Owings and Merrill and constructed by Webcor Builders. Construction began on the highrise sometime around 2001. The project was completed in 2005 along with the retrofit of historic nine-story The Williams Building, which was incorporated and annexed to the tower. The tower houses 102 luxury Condominiums, 269 hotel rooms, a 4-story subterranean parking garage, and Yerba Buena's newest museum, the Museum of the African Diaspora.