N.D. Cent. Code § 45-11-08.1: Principal place of business

Each partnership which files a fictitious name certificate shall have and continuously maintain on file in the office of the secretary of state an address of the principal place of business, which must also serve as a mailing address. The address of the principal place of business may be changed by notifying the secretary of state. The notification must contain the name of the partnership, the state or country of organization, and the new address of the principal place of business.