Section 48-49-40 applies to buildings that existed upon the effective date of this chapter as follows:
(1) No reconstruction, alteration, or expansion may aggravate or intensify a violation by an existing building or structure that did not comply with SECTION 48-49-40 upon its effective date.
(2) No reconstruction, alteration, or expansion may cause or create a violation by an existing building or structure that did comply with SECTION 48-49-40 upon its effective date.