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County of San Mateo SSF Health Systems MOB
South San Francisco, CA
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County of San Mateo SSF Health Systems MOB

New, three-story, 78,000 s.f. mass timber HCAI-3 medical office building for the County of San Mateo.


South San Francisco, CA


County of San Mateo


SmithGroup JJR


77,600 sq. ft



Market Sector


Delivery Method

Construction Management At Risk (CMAR)


  • Mass Timber
  • Under Construction


  • LEED Gold Certification

California’s first mass timber healthcare facility is underway. This new, three-story, 78,000 s.f. facility will be home to HCAI-3 clinical care spaces on the first floor and County administrative and support services on the upper floors. With sustainability top of mind, the County of San Mateo is targeting LEED Gold for this primarily electric building that includes recycled materials and, being mass timber, will emit significantly less embodied carbon than a concrete and steel building. The building features raised access floors for power and data instead of a more traditional above ceiling configuration.

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XL’s partnership with the County of San Mateo is based on trust and reliability. I would use them for any of our large and challenging projects.

Sam Lin
Assistant Director, County of San Mateo

XL’s preconstruction services on the San Mateo County South San Francisco Wellness Center has been invaluable. Their ability to provide on-demand cost and schedule input on design decisions has allowed the team to make better holistic decisions. Their understanding of market forces and labor market conditions has had a positive impact on making better system and material selections for the project.

Tyler Krehlik
Principal, SmithGroup

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