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181 Fremont Street


Client: Herrick Steel
CAPEX: US$500 Million
Location: San Francisco
Project Duration: 2014 - 2015
Key Services: 3D BIM Modelling

Projects Details

181 Fremont Street is an 802 ft. (244 m) mixed-use skyscraper under construction in the South of Market District of San Francisco, California. The building, designed by Heller Manus Architects, will be located adjacent to the Transbay Transit Center and 199 Fremont Street developments. The slender mixed-use tower, is set to rise 700 ft. (210 m) to the roof with 54 floors of offices and residential condominiums. A parapet/mechanical screen will reach to 745 ft. (227 m), and a spire will bring the total height to 802.5 ft. (244.6 m).

The tower will contain 411,000 sq. ft. (38,200 m2) of office space on the lower 33 floors (from 3 to 35), and 68 condominiums on the upper 15 floors (from 38 to 52). The 36th floor will contain residential amenities and a two-story open air terrace. Mechanical spaces would be on floors 2, 37, 53 and 54. The building will have a direct connection to the rooftop park atop the adjacent Transbay Transit Center from the fifth floor.

Upon completion, the tower will be the tallest mixed-use building in San Francisco, surpassing the nearby Millennium Tower, and the tallest in the Western United States. If completed by 2016, it will be the second tallest building in the city, after the Transamerica Pyramid. However, it is expected to be surpassed by the Transbay Tower in 2017, making it the city's third tallest in the foreseeable future. 181 Fremont joins several other buildings designed to catalyze the San Francisco Transbay development area.

The structure uses a traditional steelwork core for stability in conjunction with the mega frame design and moment frame perimeter steelwork.

Projects Challenges/Highlights

PDC are responsible for detailing of steelwork for all aspects of the build. The scope includes Buckling Restrained Bracings and dampers in the mega frame design due to the seismic conditions of the San Francisco area.