25 C.F.R. § 162.454 : Indians — BUREAU OF INDIAN AFFAIRS, DEPARTMENT OF THE INTERIOR — LAND AND WATER — LEASES AND PERMITS — BUSINESS LEASES —SUBLEASES — What are the consent requirements for a sublease of a business lease?

(a) Unless the lease provides otherwise, the lessee must notify all Indian landowners of the proposed sublease.
(b) The Indian landowners must consent to a sublease of a business lease in the same percentages and manner as a new business lease under §162.012, unless the lease:
(1) Provides that individual Indian landowners are deemed to have consented where they do not object in writing to the sublease within a specified period of time following the landowners' receipt of the sublease and the lease meets the requirements of paragraph (c) of this section;
(2) Authorizes one or more representatives to consent to a sublease on behalf of all Indian landowners; or
(3) Designates us as the Indian landowners' representative for the purposes of consenting to a sublease.
(c) If the lease provides for deemed consent under paragraph (b)(1) of this section, it must require the parties to submit to us:
(1) A copy of the executed sublease or other documentation of any Indian landowners' actual consent;
(2) Proof of mailing of the sublease to any Indian landowners who are deemed to have consented; and
(3) Any other pertinent information for us to review.

25 C.F.R. § 162.454