123 Mission Street, Office skyscraper in SOMA district, San Francisco, United States

123 Mission Street is a 124 m (407 ft) office skyscraper of 29 floors in the SOMA neighborhood of San Francisco, completed in 1986. It was developed by Shorenstein Properties and designed by Skidmore, Owings & Merrill, and holds 363,000 square feet of real estate. It is sometimes referenced as the Pacific Gas & Electric Building.

Developed by Shorenstein Properties and designed by Skidmore, Owings & Merrill, the tower was completed in 1986. Northwood Investors bought it in 2018 for about $290–300 million from the Chinese insurer HNA Group. Juul purchased it in June 2019 for a reported $397 million, then laid off 23 employees there that November and considered selling. By May 2023 the vacancy rate reached 89.9%.

The tower's name comes from its address on Mission Street, and its alternate name recalls utility company Pacific Gas & Electric, a former occupant. Since 2019 it has been associated with Juul, which bought it for about $397 million and later cut staff there. By May 2023 the Chronicle reported an 89.9% vacancy rate in the building.

The tower stands at 123 Mission Street between Beale and Fremont streets in the SOMA district, a short walk from the Embarcadero BART and Muni Metro stations. The lobby is not a public attraction; visitors generally have business with tenants. Expect heavy pedestrian traffic on weekdays and quieter sidewalks on weekends.

The building was purchased in 2019 by Juul, the vaping company, in one of San Francisco's largest tech-industry real estate deals at that time. This sale marked a shift in how technology companies were reshaping the city's commercial landscape.