; and (B) provides for the requirements of this Act relating to spectrum over Tribal lands to be administered pursuant to existing policies and procedures for spectrum management and coordination. (5) New buildout requirements for existing license holders In carrying out section 6(a) (relating to the build or divest process), the Commission shall do the following: (A) Additional construction requirements for large or remote Tribal lands Where an existing third-party licensee has satisfied the applicable construction requirements for a license over Tribal lands, yet the area that the license covers remains underserved, the Commission shall initiate and complete a rulemaking proceeding to determine an additional construction requirement for the Tribal lands of large, land-based Indian Tribes to expedite service and immediate broadband and telecommunications deployment or other full use of spectrum over Tribal lands. (B) Additional timeline considerations Subject to section 6(a), the Commission shall consider additional timelines on an ad hoc basis through Tribal consultation with the Indian Tribe or Native Hawaiian organization in which the third-party licensee possesses a valid spectrum license over Tribal lands. Considerations of any modified timelines must be made with the adequate consent of the Indian Tribe or Native Hawaiian organization. (6) Specific bands of available spectrum over Tribal lands (A) In general The Commission shall initiate and complete a rulemaking proceeding to identify the licensed and unlicensed spectrum bands that are available for deployment of services over Tribal lands as defined under this Act, including existing reservations, landless Indian Tribes, noncontiguous land holdings, uniquely situated Indian Tribes, and the Hawaiian Home Lands. (B) Requirements In carrying out subparagraph (A), the Commission shall— (i) hold field hearings initiated with adequate notice; (ii) establish and make public specific processes to identify available spectrum bands over Tribal lands