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Steven T. Mattas

Headshot of Steve Mattas
Steven T. MattasPrincipal510.808.2000Bio PDF


Steven Mattas is the City Attorney for the City of Walnut Creek and Town of Los Altos Hills, and Assistant City Attorney for the City of South San Francisco. He also serves as General Counsel for the Tri‐Valley Transportation Council, Santa Cruz County Regional Transportation Commission, Ventura County Transportation Commission, Sunol Smart Carpool Lane Joint Powers Authority, South San Francisco Conference Authority and Monterey County Housing Development Corporation, as well as Special Counsel to several public agencies (including Alameda County Transportation Commission and San Francisco County Transportation Authority) and private developers. Steven focuses his practice on land use, transportation, environmental law, public agency elections and municipal law.

Recognized statewide for his land use work, Steven is the managing co-editor and an update coauthor of numerous chapters in the leading comprehensive publication on land use law, California Land Use Practice, published and updated annually since 2006 by Continuing Education of the Bar. He also authored and contributed to several chapters of the book, including those covering general and specific plans, sustainability and climate change regulations, housing, specially regulated land uses, and compliance with federal, state and regional agency requirements for wetlands and endangered species, wastewater and stormwater discharges, annexation issues, and much more.

Steven frequently authors articles and gives presentations on land use law, public agency compliance with the Americans with Disabilities Act, density bonus and adult business regulations, among other topics. He has spoken before the California State Bar, the League of California Cities (LOCC) and many other organizations. He previously served as the City Attorney Department representative to the LOCC’s Housing, Community and Economic Development Committee and the Environmental Quality Committee. Steven has also served as an expert witness on land use and Fair Housing Act issues for the City of San Diego.


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