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If alterations are undertaken to a historic building or facility and the entity undertaking the alterations believes that compliance with the requirements for accessible routes (exterior and interior), ramps, entrances or toilets will threaten or destroy the historic significance of the building or facility, the entity shall consult with (i) the Commission on Chicago Landmarks if the building or facility has been designated or preliminarily designated as a Chicago Landmark in accordance with Article XVII of Chapter 2-120 of this code; and, (ii) in all other cases, the Illinois Historic Preservation Agency. If the building or facility has been designated or preliminarily designated as a Chicago Landmark, the determination that an alteration will threaten or destroy the historic significance of the building or facility shall be based upon the requirements of the Chicago Landmark Ordinance and any rules and regulations promulgated thereunder; in all other cases, the determination shall be based upon the Secretary of the Interior's Standards for Rehabilitating Historic Buildings. If, after applying the relevant legal standard, the applicable Commission or Agency determines that compliance with the requirements for accessible routes (exterior and interior), ramps, entrances or toilets will threaten or destroy the historic significance of the building or structure, the alternative requirements of Section 18-11-1118.2.3 may be used.