(2) A tribe may assume all or any part of the functions of a State Historic Preservation Officer in accordance with subsections (b)(2) and (b)(3), with respect to tribal lands, as such responsibilities may be modified for tribal programs through regulations issued by the Secretary if --

(A) the tribe's chief governing authority so requests;

(B) the tribe designates a tribal preservation official to administer the tribal historic preservation program, through appointment by the tribe's chief governing authority or as a tribal ordinance may otherwise provide;

(C) the tribal preservation official provides the Secretary with a plan describing how the functions the tribal preservation official proposes to assume will be carried out;

(D) the Secretary determines, after consultation with the tribe, the appropriate State Historic Preservation Officer, the [Advisory] Council (if the tribe proposes to assume the functions of the State Historic Preservation Officer with respect to review of undertakings under section 106), and other tribes, if any, whose tribal or aboriginal lands may be affected by conduct of the tribal preservation program --

(i) that the tribal preservation program is fully capable of carrying out the functions specified in the plan provided under subparagraph (c);

(ii) that the plan defines the remaining responsibilities of the Secretary and the State Historic Preservation Officer;

(iii) that the plan provides, with respect to properties neither owned by a member of the tribe nor held in trust by the Secretary for the benefit of the tribe, at the request of the owner thereof, the State Historic Preservation Officer, in addition to the tribal preservation official, may exercise the historic preservation responsibilities in accordance with subsections (b)(2) and (b)(3); and

(E) based on satisfaction of the conditions stated in subparagraphs (a), (b), (c), and (d), the Secretary approves the plan.