No subdivision, site plan or special use permit shall be approved, no Building and Zoning Permit, certificate of use, or certificate of occupancy issued, or variance granted under this chapter for any premises upon which there is an existing violation of this chapter or any related Town, County or State regulation governing either building construction, development or the use of land, buildings and structures within the Town of Schodack. This limitation does not, however, prohibit such an approval, issuance, or grant with respect to a legal nonconforming use or legal nonconforming structure.