; (5) obtaining, improving access to, or establishing communications sites on or adjacent to Federal recreational lands and waters managed by a Federal land management agency; and (6) any combination of purposes described in subparagraphs (1) through (5). (b) Clarification of cooperative agreement authority for the forest service Section 8705(f) of the Agriculture Improvement Act of 2018 ( 43 U.S.C. 1761a(f) ) is amended by adding at the end the following: (6) Cooperative agreement authority Subject to the availability of appropriations made in advance for such purposes, the Secretary may enter into cooperative agreements to carry out the activities described in subparagraphs (A) through (D) of paragraph (4). . (c) Assessment of rental fee retention authority Not later than 1 year after the date of the enactment of this title, the Secretary shall conduct a comprehensive assessment to evaluate the potential benefits of rental fee retention whereby any fee collected for the occupancy and use of Federal lands and waters authorized by a communications use authorization would be deposited into a special account and used solely for activities related to communications sites on lands and waters managed by the Secretary. E Public–Private Parks Partnerships 151. Authorization for lease of forest service administrative sites Section 8623 of the Agriculture Improvement Act of 2018 ( 16 U.S.C. 580d note; Public Law 115–334 ) is amended— (1) in subsection (a)(2)(D), by striking dwelling; and inserting dwelling or multiunit dwelling; ; (2) in subsection (c), by striking Secretary in the middle of the sentence and inserting Chief of the Forest Service, or their designee ; (3) in subsection (e)— (A) in paragraph (3)(B)(ii)— (i) in subclause (I), by inserting such as housing, after improvements, ; (ii) in subclause (II), by striking and at the end; (iii) in subclause (III), by striking or at the end and inserting and