555 Mission Street is a 33 story, 147 m office tower in the South of Market area of San Francisco, California. Construction of the tower began in 2006 and the tower was finished on September 18, 2008. It is the tallest office building constructed in San Francisco since the 1980s. The building is the part of a new generation of skyscrapers in San Francisco's downtown built on Mission Street since 2000, including The Paramount, the St. Regis Museum Tower, Millennium Tower, 101 Second Street, and JP MorganChase Building.