When a grant is made upon condition subsequent and subsequently is defeated by the nonperformance of the condition, the person otherwise entitled to hold under the grant must reconvey the property to the grantor or the grantor's successors by grant duly acknowledged for record.
N.D. Cent. Code § 47-10-16
Reconveyance when estate defeated by nonperformance of condition subsequent
Official source: North Dakota Legislative Branch. Reproduced from public-domain North Dakota statutes; confirm against the official source for the current text. Not legal advice.