Salesforce Tower, San Francisco

Salesforce Tower, formerly known as the Transbay Tower, is a 1,070 foot (326 m) office skyscraper in the South of Market district of downtown San Francisco. It is located at 415 Mission Street between First and Fremont Streets, next to the Transbay Transit Center site. Salesforce Tower is the centerpiece of the San Francisco Transbay redevelopment plan. The plan contains a mix of office, transportation, retail, and residential uses. This was the last building designed by Cesar Pelli to be completed in his lifetime.

The tallest skyscraper in the San Francisco skyline, with a top roof height of 970 feet (296 m) and overall height of 1,070 feet (326 m), surpassing the 853 feet (260 m) Transamerica Pyramid. It is also the second-tallest building west of the Mississippi River after the 1,100 feet (335 m) Wilshire Grand Center in Los Angeles. While the Salesforce Tower is taller than the Wilshire Grand if decorative spires are excluded, the Salesforce Tower has a shorter roofline than Los Angeles' U.S. Bank Tower, meaning that the Salesforce tower is also second tallest according to roofline.

The footprint of Salesforce Tower rests on land fill near San Francisco's original waterfront, an area prone to soil liquefaction during earthquakes. To account for this seismic risk, the tower uses a design that is modeled to withstand the strongest earthquakes expected in the region. Its foundation includes 42 piles driven down nearly 300 feet (91 m) to bedrock and a 14 foot (4.3 m) thick foundation mat.

The architectural firm chosen to design the Salesforce Tower were also the designers of the Gran Torre Santiago, the tallest building in South America to which the building is heavily influenced. The Salesforce Tower consists of a glass and steel curtain wall, surrounding a structural steel frame, which surrounds a reinforced concrete core.