County of San Mateo

County Office Building 3 Headquarters

Redwood City, CA

The new San Mateo County Government Center headquarters will stand as a testament to environmental stewardship and provide benefits for generations. The iconic structure will be the first Net Zero Energy, mass timber civic building in the nation. Configured into an H-shape the 208,000sf, five-story structure consists of a mass timber and glulam as well as CLT deck structure. The building incorporates two generous public plazas, flexible office space, a gym, café, multi-purpose rooms, and board chambers for the San Mateo County Board of Supervisors. 

The interior features many areas of exposed wood, while the facade compliments with copper anodized aluminum panels alongside sizable glass segments, inviting natural light throughout the building. COB3 will achieve LEED Platinum and Net Zero Energy by utilizing the power produced by solar arrays on the 368,000sf, seven-story parking structure. The parking structure includes 1,200 stalls, 124 EV chargers, and will meet the parking needs of COB3 employees and the other facilities in the County Government Center.

Truebeck provided preconstruction services, target value design, Construction Technology & Innovation (CTI) services including BIM and 4D scheduling, self-perform work, construction management, and jobsite safety on the project.  

  • Architect
  • Skidmore Owings & Merrill LLP (COB3)
  • Watry Design (Parking Stucture)
  • Total Square Footage
  • 208,000 (COB3)
  • 368,000 (Parking Structure)

COB3 is first civic building in the United States that boasts mass timber construction and Net Zero Energy, a reflection of the County’s unwavering commitment to sustainability and leading by example. 

A benchmark

Truebeck provided preconstruction, including extensive value engineering that saved the client more than $60 million dollars without sacrificing aesthetics and function.

Mass timber reduced structural embodied carbon by


Prioritizing best sustainable design practices and performance optimization, including solar panels on both structures, supports the project’s goal of Net Zero Energy and LEED Platinum—making COB3 one of the first Net Zero Energy, ultra-low-carbon civic buildings in the county.