§ 13.4. Continuance of a nonconforming building.
A nonconforming building existing at the time of the enactment or amendment of this ordinance may be retained except as follows:
13.4-1 No building other than a single-family detached dwelling may be enlarged, or altered except in conformance with this ordinance but it may be repaired to the extent necessary to maintain it in a safe and sanitary condition.
13.4-2 No building other than a single-family detached dwelling shall be rebuilt, altered or repaired after damage exceeding 75 percent of its replacement cost at the time of destruction, except in conformity with this ordinance.