Steven T. Mattas


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 Ventura County Transportation Commission and South San Francisco Conference Authority and as special counsel to several public agencies and private developers. Steven focuses his practice on land use, environmental law, public agency elections and municipal law.

The Daily Journal selected Steven as one of the “Top 25 Municipal Lawyers in California” for 2011. In 2013, Steven was recognized as a “Top Rated Lawyer in Land Use and Zoning” by the Martindale-Hubbell Bar Register of Preeminent Lawyers. Steven has also received the Martindale-Hubbell AV Preeminent Rating, the highest possible rating from members of the Bar.

Recognized statewide for his land use work, Steven is the Co-Managing Editor of a leading comprehensive publication on land use law, California Land Use Practice, published by Continuing Education of the Bar in 2006 and updated annually. 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.

Honors and Awards

  • Recipient, AV Preeminent Rating, Martindale-Hubbell
  • Recipient, “Top Rated Lawyer in Land Use and Zoning,” Martindale-Hubbell, 2013
  • Recipient, “Top 25 Municipal Lawyers in California,” Daily Journal, 2011

Presentations and Publications

  • Speaker, “Redevelopment in the Post-Redevelopment Agency World: How Will it Work? What Are the Keys to Success?” PEMA Luncheon, 2012
  • Speaker, “Liquor Stores, Bars and Nightclubs: Conditional Use Permits and Best Practices for Regulating Alcohol Sales,” League of California Cities (LOCC) Annual Conference, 2011
  • Panelist, Sustainable Development Strategies: “Get Informed and Participate in Developing the Regulations or Get Run Over,” California State Bar Real Property Section Annual Meeting, 2009
  • Speaker, "Public & Private Partnerships," Sonoma County Bar Association, 2008
  • Speaker, "Sustainability Regulations: Surveying Trends Involving Voluntary, Mandatory and Incentive Based Standards and Analyzing the Legal Framework and Relative Successes and Challenges of Various Standards,” California Environmental Law Conference, 2008
  • “The Development Process in a Nutshell,” California State Bar Annual Conference, 2008
  • "Advanced Zoning and Land Use," Lorman Seminar, 2007 and 2006
  • Adam U. Lindgren and Steven T. Mattas, “California Land Use Practice Annual Update,” Continuing Education of the Bar (CEB) 2007
  • “The Development Process in a Nutshell,” The State Bar of California, 2006
  • "Land Use Update," LOCC, 2006
  • “Zoning and Land Use in California,” Lorman Seminar, 2006
  • “A Year in the Life of a Development Deal,” Lorman Seminar, 2006
  • Adam U. Lindgren and Steven T. Mattas, California Land Use Practice, Continuing Education of the Bar (CEB) 2006
  • Steven T. Mattas and Kyle La Londe, "SB 1818 Density Bonus Law – The New Math," LOCC, City Attorney Continuing Education Series, 2005
  • "Major Land Use Laws," NBI Seminar, 2005
  • Adam U. Lindgren and Steven T. Mattas, California Zoning Practice Update, Continuing Education of the Bar (CEB) 2004 and 2005
  • "California Land Use: Current Issues in Subdivision, Annexation and Zoning Law,” 2002
  • Steven T. Mattas and Jerry Haag, “Regulating Adult Business,” Western City Magazine, 1992
  • Steven T. Mattas, “Americans with Disabilities Act: Obligations Imposed on Public Entities,” Public Law Journal, Vol. 16, No. 2, 1992

Professional and Community Affiliations

  • Member, The State Bar of California


  • University of California at Davis, King Hall School of Law, JD, 1991
  • University of California at Los Angeles, MA, Architecture and Urban Planning, 1988
  • University of California at Irvine, BA, Social Ecology with an emphasis in Urban Planning, 1986