Landlord's requirement that all adults establish legal residency, prompting a disparate impact on one ethnic group, states a claim under a theory of disparate impact. At summary judgment stage, that impact is then balanced against justifications for the policy.
http://www.ca4.uscourts.gov/opinions/171723.P.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.