Trevarthen is Board Certified in City, County and Local Government Law by The Florida Bar, and is a Fellow of the American Institute of Certified Planners. In addition to leading the Town Attorney team since March of 2009 and serving as a member of the firm and the chair of its municipal planning and land use law practice group, she represents other governmental entities in the areas of land use law and local government law.
Her practice includes extensive constitutional law in her field, including regulatory taking cases and land use and zoning decisions raising First Amendment issues, including sign codes, adult use regulations and regulation of religious uses.
A member of the American Institute of Certified Planners, Trevarthen speaks frequently throughout North America on planning, zoning and land use issues. Trevarthen is also published widely on those subjects.