Tree fallen on a vacant neighboring property

[Scott Gresham]

I have a friend that lives in a well-kept neighborhood, no HOA, but he lives next door to a vacant home with a tree that has fallen on the back of the house. There is a hole in the roof, and it has been that way for the better part of the year. He can't get in touch with the owner listed on the deed. Is this just something he has to report to the city or there are any other actions he can take?