; considerations The requirements of this subparagraph with respect to a variance are as follows: (i) The variance is granted by an official from a duly constituted State or local zoning authority, or other authorized public body responsible for regulating land development or occupancy in flood-prone areas. (ii) In the case of new construction, such official has determined— (I) that neither floodproofing nor elevation of the new structure to the base flood elevation is practicable; and (II) that the structure is not located in— (aa) a designated regulatory floodway; (bb) an area riverward of a levee or other flood control structure; or (cc) an area subject to high velocity wave action or seaward of flood control structures. (iii) In the case of existing structures— (I) if such structure is substantially damaged or in need of substantial repairs or improvements, such official has determined that neither floodproofing nor elevation to the base flood elevation is practicable