If you lived in one unit of a duplex you owned, you are exempt from anti-discrimination laws. This is also true for a four-plex.
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That isnt true in my state.
http://www.glad.org/rights/maine/c/anti-discrimination-law-in-maine/
Are any landlords exempt from the housing anti-discrimination law?
The following landlords are exempt from the law:
an owner-occupied 2-family dwelling;