No building or structure shall be erected, constructed, reconstructed or altered, nor shall any building, structure or land be used for any purpose except as provided herein in which such building, structure, or land is situated except as provided herein.

No building or structure shall be erected, constructed, reconstructed or altered to exceed the height limit herein established of the district in which such building or structure is located.

No lot area shall be reduced or diminished so that the yards or other open spaces shall be smaller than prescribed by this ordinance, nor shall the density of population be increased in any manner, except in conformity with the area regulations established herein. No parking area, parking space or loading spaces which existed at the time this ordinance became effective or subsequent thereto which is provided for the purpose of complying with the provisions of this ordinance, shall thereafter be relinquished or reduced in any manner below the requirement established by this ordinance.