In interpreting and applying the provisions of this chapter, they shall be held to be the minimum requirements for the promotion of the public safety, heath, convenience, comfort, prosperity, or general welfare. It is not intended by this chapter to interfere with, or abrogate or annul any easement, covenants, or other agreement between parties; provided, however, that where this chapter imposes a greater restriction upon land development or construction, or the use of buildings or premises or upon height of buildings, or requires larger open spaces than are imposed or required by other resolutions, ordinances, rules, regulations, or by easements, covenants or agreements, the provisions of this chapter shall govern. If, because of error or omission in the Zoning District Map, any property in the jurisdiction of the Town is not shown as being in a zoning district, the classification of such property shall be classified NR until changed by amendment.