On Tuesday, the Contra Costa County Board of Supervisors opened the new County Administration Building in the City of Martinez.
This new facility stands on the historic grounds previously occupied by a taller, outdated office tower and a jail dating back to around 1902, both of which were demolished to make way for modern development.
The new building showcases state-of-the-art architecture that harmonizes beautifully with the surrounding historic buildings, rejuvenating the public plaza. It embodies sustainability with on-site photovoltaics for high-performance energy use, responsibly sourced finishes, and low embodied carbon materials.
The development significantly enhances community space by adding a new public law library, ground-floor retail spaces, and a parking garage. It also includes street improvements and an advanced stormwater system tailored to the site’s unique groundwater challenges and topography. Internally, the building acts as a hub for several County administrative departments, including the Office of Racial Equity and Social Justice, the Law Library, the Public Defender, and the County Sheriff’s Civil Division, consolidating essential services under one roof to improve service delivery and enhance community interaction.
According to the county, the new building is a significant contribution to Contra Costa County, where modernity meets tradition and community service meets innovation.
The Contra Costa County Administration Building is located at 1025 Escobar St, Martinez. A video tour of the new building is available — click here.
