Cassie J. Tostenson

Top rated State, Local & Municipal attorney in Mayville, North Dakota

Nilson Brand Law
Cassie J. Tostenson
Nilson Brand Law

Practice Areas: State, Local & Municipal, Estate Planning & Probate, Business & Corporate; view more

Licensed in North Dakota since: 2014

Education: Santa Clara University School of Law

Selected to Super Lawyers: 2021 - 2023

Nilson Brand Law

36 Main St W
Mayville, ND 58257 Visit website


Cassie J. Tostenson is an attorney at the law firm Nilson Brand Law in Mayville, North Dakota. Ms. Tostenson has over 18 years of experience with estate and probate matters. She also works for cooperative associations and handles municipal and water issues. She represents clients in Mayville, Fargo, Grand Forks, Red River Valley and throughout eastern North Dakota and northwestern Minnesota.

Raised in Bismarck, North Dakota, Ms. Tostenson graduated from the University of North Dakota with a bachelor’s degree in political science. She went on to earn her law degree, with a public interest certificate, from Santa Clara University School of Law.

Ms. Tostenson is licensed to practice law before the state courts of North Dakota, Minnesota and California, as well as the U.S. District Court for the District of North Dakota and the U.S. District Court for the Eastern District of California. Over the course of her career, she has guided numerous clients through the complexities of the estate planning and probate process.

In her work with cooperative associations and political subdivisions, Ms. Tostenson provides valuable counsel to her clients. She is a respected member of her legal community and is known for her knowledge, competence and professionalism.

Staying involved in her legal community is a priority for Ms. Tostenson. She is an active member of the State Bar Association of North Dakota, the Minnesota State Bar Association, The State Bar of California and the Randy H. Lee American Inn of Court. She also belongs to the North Dakota Municipal Attorneys Association and the North Dakota Council of School Attorneys.

Practice areas

State, Local & Municipal, Estate Planning & Probate, Business/Corporate

Focus areas

Business Formation and Planning, Business Organizations, Contracts, Estate Planning, Guardianships & Conservatorships, Limited Liability Companies, Living Wills, Partnership, Power of Attorney, Probate & Estate Administration, State, Local & Municipal Litigation, Trusts, Wills

  • 50% State, Local & Municipal
  • 40% Estate Planning & Probate
  • 10% Business/Corporate

First Admitted: 2002, California

Professional Webpage:

Pro bono/Community Service:
  • North Dakota Council of School Attorneys
Bar/Professional Activity:
  • U.S. District Court Eastern District of California
  • North Dakota Municipal Attorneys Association
  • Randy H. Lee Inns of Court, Member
  • State Bar Association of North Dakota
  • Minnesota State Bar Association
  • California State Bar Association
  • U.S. District Court District of North Dakota
  • Member of the North Dakota Municipal Attorneys Association, 2020
  • Member of the North Dakota School Board Attorneys Association, 2020
  • Admitted to practice by the State Bar of California, 2002
  • Member of the Randy Lee Inns of Court-Grand Forks, ND, 2020
  • Admitted to practice in ND State and Federal Courts, 2014
  • Admitted to Practice in Minnesota, 2009
  • Pro bono work for East San Jose Law Clinic, Santa Clara University School of Law
  • Public Interest Law Certificate, Santa Clara University
Educational Background:
  • University of North Dakota, Grand Forks, ND Bachelor of Arts-Political Science Member of Mortar Board and Golden Key Honor Societies, 1998; Delta Gamma Senior of the Year, 1999; Delta Gamma Scholar Award, 1996-1999; Member of Panhellenic Council and Rush Counselor; Recipient of Miriam Landers Memorial Scholarship, 1998; Member of Toastmasters, 1996-1999; Member of UND Student Government and Finance Committees, 1999
Special Licenses/Certifications:
  • Public Interest Certificate-Santa Clara University School of Law, 2002
Scholarly Lectures/Writings:
  • Presented along with Attorney Lynn Slaathaug Moen to school board members from the state of North Dakota on the impact of the "Me Too" specifically as to school districts legal liability, Co-Presenter-North Dakota School Board Association Annual Convention, "The Me Too Movement and Its Impact on the School Environment.", School Districts, 2018
  • Presentation to the North Dakota School Board Association School Law Seminar regarding First Amendment Rights of Students and Employees, Co-Presenter-North Dakota School Board Association, "Employee and Student Free Speech Rights", School Districts, 2020
  • Presentation before the North Dakota Telephone Association focusing on a variety of estate planning and businesses success planning and tools, Presenter at the 2019 Telecom Operations Conference and Showcase, Wills, POAs, and Estate Planning., 2019
  • Represented a municipality through the creation of a $15 million dollar street and sewer improvement assessment district. My representation included assisting city council with passing necessary resolutions, creating an assessment district, working with city engineers, mayor, auditor and bond counsel to secure financing, 2020
  • Assisted a rural cooperative board with drafting of modern bylaws, presenting changes to its members and with their approval through a vote of the cooperative's members, 2017
  • Represented a rural fire protection district with adoption of bylaws, passing a vote of its members to raise mill levy to construct of new fire station. Assisted in all aspects including the acquisition property, sale of prior facility, financing construction through bonding and issues that arose during construction, 2017
Representative Clients:
  • City Attorney for the City of Portland, 2020
  • City Attorney for Finley, ND, 2020
  • General Counsel for the Steele County Water Resource District, 2020
  • General Counsel for Red River Communications, 2020
  • City Attorney for the City of Buxton, 2017
  • General Counsel for Halstad Telephone Company, 2020
  • City Attorney for the City of Hope, ND, 2015
  • City Attorney for the City of Mayville, ND, 2020
Industry Groups:
  • Families
  • Farms
  • Political Subdivisions
  • Small Businesses

Office location for Cassie J. Tostenson

36 Main St W
Mayville, ND 58257

Phone: 701-786-6040


3 Years Super Lawyers
  • Super Lawyers: 2021 - 2023

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