; and (cc) a person who is incapable of complying with the requirement under subclause (I) due to a documented medical condition. (III) The Secretary shall require a project owner to verify compliance with the requirement under this clause by each person occupying a dwelling unit pursuant to a preference under clause (i)(I) annually in conjunction with reviews of income for purposes of determining eligibility for assistance described in clause (i). (iv) A dwelling unit that is occupied by a person pursuant to a preference under clause (i)(I) may contain more than one bedroom only if such additional bedrooms are occupied only by other persons who occupy such dwelling unit pursuant to a preference under clause (i)(I). (v) The project owner shall terminate any occupancy of a person pursuant to the preference under clause (i)(I) upon the person attaining 25 years of age or upon substantial noncompliance with the requirement under clause (iii), except that nothing in this clause may be construed to prohibit the occupancy in a project assisted under this paragraph by, or the provision of rental assistance under this paragraph for, any person, or to affect the eligibility of any person for such occupancy or assistance, other than pursuant to a preference under clause (i)(I). . 5. Exceptions to limitations for project-based voucher assistance (a) Percentage limitation The first sentence of clause (ii) of section 8(o)(13)(B) of the United States Housing Act of 1937 ( 42 U.S.C. 1437f(o)(13)(B)(ii) ) is amended by inserting before or that the following: that house eligible children described in section 6(c)(4)(A)(iii) who comply with the requirements under section 39(c), . (b) Income-Mixing requirement Subclause (I) of section 8(o)(13)(D)(ii) of the United States Housing Act of 1937 ( 42 U.S.C. 1437f(o)(13)(D)(ii)(I) ) is amended by inserting after elderly families the following: , to eligible children described in section 6(c)(4)(A)(iii), . 6. Guidance regarding implementation (a) In general The Secretary of Housing and