N.D. Cent. Code § 22-01-12: Limitations upon obligation of guarantor

The obligation of a guarantor must be neither larger in amount, nor in other respects more burdensome, than that of the principal. A stockholder or partner of any entity, including a limited liability company, business corporation, professional corporation, and partnership, may enter into a separate contract of guaranty for the real estate mortgage debt of the entity. If in its terms the obligation exceeds that of the principal, the obligation is reducible in proportion to the principal obligation.