No, there is no specific law on the books that says you can not rent an apartment or house to an illegal alien. That does NOT mean that you have a legal right to do it, it only means that a landlord is not required to know the nationality status of the rentee and if the rentee turns out to be illegal, the landlord is not in trouble. As the above poster points out, landlords are not responsible for the behavior or legal status of their tenants. If a renter gets caught smoking pot or cheating on their income tax, the apartment mgmt is not going to go to jail for it. Yes, many apartment complexes do require identification and proof of employeement, but neither of those prove nationality. Furthermore, even that level of validation is not legally required - apartment complexes do that to ensure they will get their rent money, not because you have to. If you have a guest house and want to just rent it out to somebody, you could do it on nothing more than a verbal agreement and a handshake if you want (would not be smart of course). Now, if they could prove that the apartment complex was knowingly and delibrately renting to illegals (ie: intentionally running the place as a safe house, etc) than they might be in legal trouble, but I doubt anyone in Arizona would do anything about it. I live in Phoenix and probably 50% of the businesses here from cafes to hotels to department stores to farms to yard care to construction to janitorial work openly employ illegal aliens in one way or another and have them working openly in public on a regular day to day basis and nobody really seems to care - not the business owners, not law enforcement, not the politicians (of either party) and not even most individual citizens who loudly complain about illegals while happily soliciting the businesses that hire them without complaint. If 'harbouring an illegal alien' was an enforced crime than half the business owners in Phoenix would be in jail. However, while most people consider illegal aliens crossing the border to be a big problem (which it is), they also seem to consider illegal aliens working in their favorite shop or cafe or business to be invisible (which they are not). And since these invisible employees need a place to live, they tend to be 'invisible' in their houses and apartments too.