N.D. Cent. Code § 40-22-12
If an improvement to be financed by special assessments consists in paving or repaving any street, alley, or public place, the governing body of the municipality may require the plans, specifications, and estimates for the improvement to be made for one kind of pavement or several different kinds of pavement as it may deem advisable. If the contemplated improvement consists of planting trees, constructing grass plots, sowing grass seed thereon, or otherwise parking or beautifying any of the streets, highways, avenues, alleys, lanes, or other public grounds within the municipal limits, the governing body may require the plans, specifications, and estimates to show the probable costs of making, constructing, or maintaining such improvements or any of them.
N.D.C.C. § 40-22-12