N.D. Cent. Code § 23-21-15
Whenever remains are removed by a relative or friend of a decedent, under the provisions of this chapter, the person causing the removal is entitled to remove any vault, monument, headstone, coping, or other improvement appurtenant to the interment space from which the remains have been removed. The affidavit or written consent given under the provisions of this chapter is sufficient authority for the cemetery authority to permit the removal of any such appurtenance. If such appurtenances remain on the plot for more than ninety days after the removal of the last human remains, they may be removed and disposed of by the cemetery authority, and thereafter no person claiming any interest in the plot, or any such appurtenance, may maintain in any court any action in relation to any such appurtenance.
N.D.C.C. § 23-21-15