While nonconformities may continue, the provisions of this chapter are designed to curtail substantial investment in nonconformities to bring about their eventual improvement or elimination in order to preserve the integrity of this Ordinance and the character of the Town and its extraterritorial jurisdiction. Any nonconforming use, structure, lot, or sign that lawfully existed as of the effective date of this Ordinance and that remains nonconforming, and any use, structure, lot, or sign that becomes nonconforming as a result of any subsequent rezoning or amendment to the text of this Ordinance, may be continued or maintained only in accordance with the terms of this chapter. This chapter also is intended to reduce vacancies, promote appropriate redevelopment and re-use of existing structures and lots, and set forth requirements.