The Transbay Tower, also known as the Transbay Transit Tower, is a 1,070 ft (326 m) tall skyscraper under construction in the South of Market district of downtown San francisco. Located at the corner of First Street and Mission Street,  next to the San Francisco Transbay Terminal  site, the tower is the centerpiece of the San Francisco Transbay development.

Ceremonial groundbreaking ceremonies occurred on March 27, 2013^. It is expected to be completed in 2017 and will have 61 floors, with a decorative crown reaching 1,070 ft (326 m). It will be the tallest building in San Francisco, surpassing the Transamerica Pyramid  by more than 200 feet (61 m). The tower would be the seventh tallest building in the United States if standing in 2013,and was expected to become the tallest building in the Western United States,  although by some measures it will be shorter than the Wilshire Grand Tower,  which is planned to open in Los Angeles , also in 2017.

The building was designed by Argentine American architect Cesar Oelli  and is being developed by Bosten Properties , who at the time of groundbreaking paid nearly $192 million for the land to the Transbay Joint Powers Authority.

General information
Status	Under construction
Type	Commercial offices
Location	101 First Street San Francisco, California
Coordinates	37.7899°N 122.3969°WCoordinates: 37.7899°N 122.3969°W
Opening	2017
Height
Antenna spire	1,070 ft (326 m)
Roof	912 ft (278 m)
Technical details
Floor count	61
Floor area	1,370,000 sq ft (127,000 m2)
Design and construction
Architect	Cesar Pelli
Developer	Boston Properties Hines Interests Limited Partnership