Except as otherwise provided, no building or structure shall be erected, converted, enlarged, reconstructed or structurally altered for use, nor shall any building or structure or land be used or changed in use, which does not comply with all of the district regulations established by this chapter for the district in which the building or structure or land is located.

The following utility uses are exempt from the provisions of this chapter: poles, wires, cables, conduits, vaults, laterals, pipes, mains, valves or any other similar equipment, but not including substations located on or above the surface of the ground for the distribution to consumers of telephone, cable television or other communications, electricity or gas.

This chapter shall apply to all structures, land, premises and uses within the corporate limits of the City of Schenectady, New York.

Any variance or special permit lawfully issued prior to the effective date of this chapter or any amendment thereof shall be deemed to be valid after the effective date of this chapter.