Salesforce Tower during its construction in January 2017
Location within San Francisco
|Former names||Transbay Tower|
|Preceded by||Transamerica Pyramid|
|Type||Commercial offices, retail|
|Location||415 Mission Street
San Francisco, California
|Owner||Boston Properties (95%)
Hines Interests LP (5%)
|Architectural||970 ft (296 m)|
|Tip||1,070 ft (326 m)|
|Design and construction|
|Architect||Pelli Clarke Pelli Architects|
|Engineer||Magnusson Klemencic Associates|
|Main contractor||Clark Construction Group /
Hathaway Dinwiddie (joint venture)
Salesforce Tower, formerly known as the Transbay Tower, is a 1,070-foot (326 m) office skyscraper under construction 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. When completed, the tower will be the tallest in San Francisco. With a top roof height of 970 feet (296 m) and an overall height of 1,070 feet (326 m), it will be the second-tallest building west of the Mississippi River after the Wilshire Grand Center in Los Angeles.
The crown of the tower, once completed, will feature a nine-story electronic sculpture created by artist Jim Campbell that will feature low resolution, abstract videos of San Francisco that will be filmed each day. This will be the tallest public art piece in the world.
Developer Hines, with a proposal by architect César Pelli, was selected as the winner of a global competition in 2007 to entitle and purchase the site. A seven-member jury of development experts assembled by the Transbay Joint Powers Authority (TJPA) selected Hines over proposals from Forest City Enterprises and architect Richard Rogers; and from Rockefeller Development Group Corp. and Skidmore Owings & Merrill. In 2012, Boston Properties acquired a 50% stake in the project and in 2013 acquired most of Hines' remaining interest to become 95% owners of the project.
The site of the tower was in a dilapidated area, formerly used as a ground-level entrance to the San Francisco Transbay Terminal, which was demolished in 2011. The TJPA sold the parcel to Boston Properties and Hines for US$192 million, and ceremonial groundbreaking for the new tower occurred on March 27, 2013. Actual below-grade construction work started in late 2013. The project is a joint venture between general contractors Clark Construction and Hathaway Dinwiddie Construction.
The footprint of Salesforce Tower rests on land fill near San Francisco's waterfront, an area prone to earthquakes. To account for this seismic risk, the tower uses an advanced design that is modeled to withstand the strongest earthquakes expected in the region.
The development was originally contracted on "spec", meaning the developer-owner did not have a major tenant lease secured beforehand (thus being a speculative development). On April 11, 2014, Salesforce.com announced that it signed a lease for 714,000 square feet (66,300 m2) on floors 1, 3-30, and 61 to become the building's anchor tenant. Previously known as the Transbay Tower, the building was renamed Salesforce Tower. The lease was valued at US$560 million over 15 and a half years starting in 2017.
The tower is expected to be completed in 2018 and will have 61 floors, with a decorative crown reaching 1,070 ft (326 m). The original proposal called for a 1,200-foot (370 m) tower, but the height was later reduced. It will be the tallest building in San Francisco, surpassing the Transamerica Pyramid by more than 200 feet (61 m). The tower is expected to become the second-tallest building in the Western United States.
Salesforce Tower's first appearance in film was the 2014 animated film Big Hero 6. Although Salesforce Tower was still under construction when the film was released, it appeared in the film as a completed tower.
Some have criticized the design for being underwhelming and even phallic. A well-known op-ed contributor to the San Francisco Examiner also criticized its lewd shape. 
The Salesforce Tower (left) surpassed the Transamerica Pyramid (right) as the tallest building in the city