Except as otherwise herein provided, nothing in this Building Code shall require removal, alteration, or abandonment of, nor prevent continue occupancy or use of, an existing building unless such building shall:
(A) Be or become unsafe, or unsanitary, according to § 150.020 below.
(B) Be or is in violation of orders, or conditions of approval, existing at the time of the adoption of this Building Code.
(C) Be changed, through major renovation, repair, alteration, addition and/or moved into or within the City of Mt. Healthy, as stipulated in § 150.003(B) at such time it shall be necessary, as per the Chief Building Official’s judgement, to update the entire existing building and/or its parts, to insure conformity to the regulations herewithin.
(‘74 Code, § 150.05)