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

Project Summary



Completion Date


Project Size
New Construction
Building Enclosures | Structures
DGA planning | architecture | interiors
Specialized Capabilities
Building Design | Temporary Construction | Geotechnical | Commissioning | Facades & Glazing | Roofing & Waterproofing

Key team members

Christopher Decareau
Christopher Decareau
Ronald Hamburger
Ronald Hamburger
Consulting Principal
Kenneth  Tam
Kenneth Tam
Associate Principal