Sac. County Dangerous Building Code 16.22.301 enumerates various conditions which constitute a public nuisance. If you can show that even one of the specifed conditions is violated, then that is grounds for the county to order the tree house's removal.
If Code Enforcement refuses to act, then you could sue the county to force them to act, via a Writ of Mandamus, or you could sue the neighbor in small claims for private nuisance, on the theory that the tree house location presents a continuing danger to your person and property.
Hope this helps.
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