Legal Question in Real Estate Law in Arizona

Any sign which gives someone clear notice is fine. I prefer "private property no trespassing," Because that tells someone they can't come on this land, because it belongs to someone else. I think most everyone in the US knows they can't go on another person's land without permission and how important this rule is. Make darn sure you know the property lines, because if you put up a sign like that on someone else's land, or on public property, that could make a real problem for yourself.

Good luck.