A lawfully existing building or structure which contains no nonconforming use, but which does not comply with the applicable lot size requirements, building bulk limitations, or off-street parking requirements, may be continued so long as it remains otherwise lawful. Such buildings or structures which shall include off-street surface parking lots are referred to in Sections 1147.02 to 1147.05 of this Zoning Code, as "nonconforming buildings" and are subject to the following requirements:
(a) Enlargement, Repair, and Alteration. A nonconforming building or structure may be enlarged, maintained, repaired, or structurally altered. However, no such enlargement, maintenance, repair, or structural alteration shall either create any additional nonconformity or increase the degree of the existing nonconformity of all or any part of such building or structure; and damaged or destroyed buildings or structures shall be subject to the restrictions in division (b) of this section. Conversions for residential purposes shall comply with the lot area requirements applicable to vacant nonconforming lots in Section 1147.02 (a) of this Zoning Code and there shall be no further encroachment upon any bulk regulations that do not comply with those of the district in which the conversion is to take place. The extension or enlargement of a nonconforming building or structure may not occupy ground space suitable and otherwise available for meeting the off-street parking requirements of this Zoning Code.
(b) Damage or Destruction. In the event that a nonconforming building or structure is damaged or destroyed, by any means, to such an extent that the cost of restoring it to the condition in which it was before such damage or destruction exceeds fifty (50) percent of the current replacement cost of the entire building or structure, exclusive of foundations such building or structure shall not be restored unless it shall thereafter conform to the regulations for the district in which it is located.
(c) Moving. No nonconforming building or structure shall be moved in whole or in part for any distance whatever, to any other location on the same or any other lot unless the entire building or structure shall thereafter conform to the regulations of the district in which it is located after being moved.
(d) Removal. Any building or structure, which is removed, shall not be replaced, unless the entire building or structure shall thereafter conform to the regulations of the district in which it is located.