As a matter of information, the Planning Board has, by special resolution of the Town Board, been given the power, simultaneously with the approval of a subdivision plat, to make any reasonable change, consistent with the public welfare, in the zoning regulations applicable to said subdivision plot, subject to the provisions of § 281 of Article 16 of the Town Law. In no case shall the zoning regulations be changed so as to increase the average density of population or cover of the land with buildings above that which is permitted in the district wherein such lands lie.