Is it against the law to rent a house or apartment to an illegal alien in USA?

I see more and more illegal aliens living in apartments near my house in Sullivan County, NY. Sometimes, they come to ask if I want to rent an apartment on top of my garage that I have for guests. The say they don’t have “papers”, and I say: it's not for rent. I wonder why they let me know about their legal... show more I see more and more illegal aliens living in apartments near my house in Sullivan County, NY. Sometimes, they come to ask if I want to rent an apartment on top of my garage that I have for guests. The say they don’t have “papers”, and I say: it's not for rent.
I wonder why they let me know about their legal status.
Update: Anyway, the apartment has no heat.
It is there to receive guest in summer time only.
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