[NotGolfer]

Originally Posted by Babubhat

Generally any part that hangs over your property line can be trimmed but you can’t damage the tree. The risk is a future tree issue could result in litigation. Many legal summaries can be google searched.

Trees and Property Lines: 9 Things All Neighbors Need to Know for Storm Season - Bob Vila

All seem valid but then a question comes with #8. Also if the neighbor has already been contacted (it's been months) but has done nothing.....this can bring frustration! Hopefully the issue can be resolved!!