Repair of existing single-family detached residential structures on LC Limited Commercial, CC Community Commercial, or GC General Commercial Lots. Any existing single-family residential structure established on any lot that is zoned LC Limited Commercial, CC Community Commercial, or GC General Commercial that is damaged by fire, explosion, storm, or other calamity, except flood damages, may be repaired and reconstructed, provided that such lot is within the Downtown Overlay District. Repair and reconstruction within the designated floodplain shall be in conformance with floodplain development regulations.