While we don't suspect that the Tree of Heaven had a direct impact on the other tree that died, we don't have an easy way to convince the property owner to remove the TOH if they aren't otherwise motivated to remove invasive species or preventatively try to discourage a lanternfly outbreak. Perhaps once they experience lanternfly population booms feeding on the tree and generating lots of honeydew that ferments around the trunk base, they may change their mind. (Granted, we realize you don't want this to happen either since you live next door, but it's not a species that the state requires property owners remove, unfortunately.) Letting them know about this common issue might sway them.

If they do opt to remove the TOH, or give you permission to hire someone to do it, make sure they follow Penn State guidelines (linked on the page above) about timing and method of removal so it's killed as efficiently and effectively as possible with the least amount of effort. If not treated with systemic herbicide first and given enough time to die before removal, cutting a tree down prematurely or without any treatment at all can result in a bunch of sucker growth from the remaining root system that can be a chore to remove, and suckers may continue to appear for months or even years after tree removal until the roots finally die out.

Miri