Substantial deterioration definition

Substantial deterioration means serious neglect in maintaining or repairing a building or structure that results in a noticeable decline in the physical quality of the building façade, building features, structural or non-structural elements and weatherproofing.
Substantial deterioration means structural degradation of such a nature that water penetration into a historic structure can no longer be prevented, or structural degradation that causes stress or strain on structural members when supports collapse or warp, evidence of which includes defective roofing materials, broken window coverings and visible interior decay.