; and (2) if the agency has responsibility for the administration or management of Federal real property and facilities, in addition to the requirements under section 4 and paragraph (1)— (A) require the construction of Federal structures and facilities to comply with— (i) the regulations and procedures issued under section 4(b)(6); and (ii) any regulations issued under the National Flood Insurance Program unless those regulations are demonstrably inappropriate for a structure or facility; (B) apply accepted floodproofing and other flood protection measures to the construction or rehabilitation of a structure or facility that is located in a floodplain; (C) when practicable, elevate a structure above the floodplain instead of filling in land; (D) provide on structures and, where appropriate, other pieces of property a conspicuous delineation of past and probable flood height— (i) if the structure or other property— (I) is used by the general public; and (II) (aa) has suffered flood damage; or (bb) is in an identified flood hazard area; and (ii) in order to enhance public awareness of, and knowledge about, flood hazards; and (E) when Federal property in a floodplain is proposed for lease, easement, right-of-way, or disposal to a non-Federal public or private party— (i) reference in the conveyance those uses that are restricted under Federal, State, or local regulations relating to floodplains; and (ii) (I) except where prohibited by law, attach any other appropriate restrictions to the uses of the property by the grantee or purchaser, as applicable, and any successors; or (II) withhold the property from conveyance. (b) Exemption The head of an agency may exempt a federally funded project from the requirement under subsection (a)(1) if— (1) the exemption is in the interest of national security; (2) the undertaking of the federally funded project is— (A) because of an emergency; or (B) a mission-critical requirement relating to a national security interest or an emergency