The restrictions and requirements imposed by this article shall be deemed to be minimum requirements necessary to conserve the value of land and buildings and encourage the most appropriate use of land to lessen congestion in the streets, secure safety from fire, panic and other dangers, promote health and general welfare, provide adequate light and air, prevent overcrowding of land, avoid undue concentration of population and facilitate the adequate provision of transportation, water, sewerage, schools, parks and other public requirements. Whenever the provisions of this article shall conflict with any state statute, local ordinance or regulation or any existing easement, covenant or agreement or any permit previously issued pursuant to law applicable to the use of any land or structure in the area specified in § 260-109, the more stringent law, ordinance, regulation, restriction or requirement shall govern.