24 CFR Part 100—Discriminatory Conduct Under the Fair Housing Act (with amendments issued through Sept. 2016)

(b) A facility or community shall, within 180 days of the effective date of this rule, develop procedures for routinely determining the occupancy of each unit, including the identification of whether at least one occupant of each unit is 55 years of age or older. Such procedures may be part of a normal leasing or purchasing arrangement.