Scope of regulations. No structure or tract of land shall hereafter be used or occupied, and no structure, or part thereof, shall be erected, altered, or moved, except in conformity with the regulations specified herein for the zoning district in which the structure or land is located. However, where a building permit for a building or structure has been issued in accordance with law prior to the effective date of this chapter, or amendments thereof, and provided construction is begun within six months of the effective date and diligently pursued toward completion, said building or structure may be completed in accordance with the approved plans. The applicant may be required to provide the Township with evidence, visual or otherwise, demonstrating to the satisfaction of the Zoning Administrator that work is being diligently pursued. Failure to diligently work toward completion shall result in the loss of legal nonconforming status unless good cause for the delay is accepted at a hearing before the Zoning Board of Appeals. Furthermore, upon completion of construction said building may be occupied under a certificate of occupancy, as approved by the Building Official, for the use for which the building was originally designated, subject thereafter to the provisions of Article 18 concerning nonconformities. Any subsequent text or map amendments shall not affect previously issued valid permits.