Nossaman LLP

Katrina Diaz


T 949.477.7661
F 949.833.7878
18101 Von Karman Avenue, Suite 1800
Irvine, CA 92612

Katrina Diaz assists clients on a variety of complex land use, environmental, eminent domain and real estate matters, including matters dealing with the California Environmental Quality Act, the National Environmental Policy Act, and the Federal and State Constitutions. 

Ms. Diaz has worked on some of the largest public works projects in California, defending environmental documents, assisting with the precondemnation acquisition process, drafting pleadings and motions, propounding and responding to discovery, and assisting with trial preparation. 

Ms. Diaz is committed to civil justice and provides pro bono legal assistance and other support to the Orange County Public Law Center.

A former Nossaman summer associate, Ms Diaz served as a judicial extern for Justice Kathleen E. O'Leary at the California 4th District Court of Appeal, Division Three, a law clerk for the City Attorney of Orange, and volunteered at the Public Law Center.

Ms. Diaz regularly comments on news, events, and policies affecting endangered species issues in California and throughout the United States on the Firm's Endangered Species Law & Policy blog.  Ms. Diaz also frequently comments on court decisions, news, and events impacting eminent domain on the Firm's California Eminent Domain Report blog.

Representative Work

San Bernardino County Transportation Commission.  Currently representing SBCTC with the acquisition of approximately 65 properties for the Downtown Passenger Rail Project, a proposed Metrolink commuter rail line between San Bernardino and Redlands.

Orange County Transportation Corridor Agencies.  Currently part of the team representing the TCAs in defending the SR 241 Extension Project. 

Exposition Metro Line Construction Authority.  Currently part of the team assisting Expo with acquiring commercially developed properties in Santa Monica necessary for future terminal stations for Phase II of the Project, along with securing easements for street widenings and utility relocations.

San Diego Association of Governments.  Currently part of the team representing SANDAG with right of way acquisitions for the Inland Rail Trails Project.

SANBAG.  Currently part of the team representing SANBAG with acquiring portions of 150+ properties for the sbX E-Street Corridor Bus Rapid Transit Project, a 15.7-mile bus rapid transit line in the Inland Empire.

Awards & Honors

Wiley W. Manuel Certificate for Pro Bono Legal Services, California State Bar Association, April 2014
Bio Photo
Bio Photo



J.D., Chapman University School of Law, 2012, cum laude; Articles Editor, Chapman Law Review; Moot Court Executive Board Member

B.A., University of California, Irvine, 2006



Professional Affiliations

Women Transportation Seminar, Orange County Chapter

International Right of Way Association, Chapter 67

The Orange County Diversity Task Force, Committee Member

Orange County Bar Association, Pro-Bono Committee Member

Awards & Honors

Wiley W. Manuel Certificate for Pro Bono Legal Services, California State Bar Association, April 2014
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