San Francisco, CA
499 Illinois Street
The 499 Illinois Street project in Mission Bay is a 500,000 sq ft biotechnology center in two buildings with laboratory, office, retail, and parking. SGH provided structural and building enclosure engineering services for the project that consists of two five-story buildings over two levels of parking with flanking retail and office spaces at grade level.
Highlights of SGH’s work for this project include the following:
- Developed an innovative foundation system incorporating steel H-piles set in an auger-cast secant wall that integrates grouts of two different strength and functions as a shoring wall, a permanent foundation wall, a below-grade groundwater cutoff wall, and a waterproofing barrier
- Incorporated a seismic force resisting system with buckling-restrained braces and composite concrete-encased steel columns designed using nonlinear response-history analysis
- Designed floors to limit walking-induced vibration to 2,000 micro-inches per second
- Designed a mat foundation that was placed in a continuous fourteen hour effort that involved an 11,000 cu yd, monolithic placement of concrete to minimize potential for water intrusion and reduce construction cost
- Designed and observed waterproofing installation below-grade, raised plaza, balconies and roofs
Provided performance criteria and third-party commissioning for design-build curtain walls
Building Enclosures | Structures
DGA planning | architecture | interiors
Building Design | Temporary Construction | Geotechnical | Commissioning | Facades & Glazing | Roofing & Waterproofing
Key team members
Grand Central Air Terminal
Designed by Henry L. Gogerty in the Spanish Colonial Revival style with Art Deco and Moderne features, the historic terminal opened in 1929. As part of a larger adaptive reuse project, SGH assessed the condition of the building enclosure and consulted on the building enclosure rehabilitation.
Salesforce Tower Excavation Support
Standing at 1070 ft, the Salesforce Tower is the centerpiece of San Francisco’s Transit Center District Plan project. At the time of construction, the excavation was one of the deepest in downtown San Francisco. SGH served as the engineer of record for the support of excavation.