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270 Brannan Street - SKS Partners, LLC

Key Features

  • 213,000 gross square foot, Class A office building in the center of San Francisco’s SOMA district

  • Two structures, 7 stories and 5 stories, separated by a courtyard, with basement parking

  • Incorporates the latest in environmentally sustainable design, targeting LEED Platinum


Geotechnical Challenges

  • Project site straddles historic San Francisco Bay shoreline, located in a complex geologic setting

  • Soil conditions include 30 feet of fill over 30 feet of bay margin deposits with high liquefaction and settlement potential

  • Sharply dipping bedrock surface

  • Adjacent structures

Innovative Solutions

  • Development of a cost-effective foundation system utilizing micropile installations

  • Mitigation of liquefaction and lateral spreading hazards through cement deep-soil mixing


A3GEO worked closely with the developer, structural engineer and contractor to develop a unique foundation support system designed to address the geotechnical, structural and adjacent building considerations. A3GEO evaluated historic use of the project site, conducted site investigation, developed geotechnical design parameters, and provided foundation recommendations. Construction complete in April 2016.


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