N.D. Cent. Code § 40-32-02: Service of notice to construct or repair

The street commissioner shall serve the notice provided in section 40-32-01 or cause the same to be served by leaving a copy thereof at the dwelling house on such lot or parcel of land with some person over the age of fourteen years residing therein, or, if the lot or parcel of land is unoccupied, by posting a copy of the notice in a conspicuous place on the land or immediately in front thereof.