42 U.S. Code § 13612 - Reservation of units for disabled families
Notwithstanding any other provision of law, for any project for which an owner gives preference in occupancy to elderly families pursuant to section 13611 of this title, such owner shall (subject to sections 13613, 13614, and 13615 of this title) reserve units in the project for occupancy only by disabled families who are not elderly or near-elderly families (and who have applied for occupancy in the housing) in the number determined under subsection (b) of this section.
(b) Number of units
Each owner required to reserve units in a project for occupancy under subsection (a) of this section shall reserve a number of units in the project that is not less than the lesser of—
(1) the number of units equivalent to the higher of—
(A) the percentage of units in the project that were occupied by such disabled families upon October 28, 1992; or