Check to see thier real property report, also check yours to confirm where the property line actually is. Perhaps, if they are willing to rebuild the garden, you can persaude them to rebuild it a little further away from the fence. (you helping them out would probobly ease the persuding)
Decks require Development permits. The city grants lots of development permits for existing decks, but one built right to the property line might be a little bit of an issue.
Ask to see the property reports, then decide what you want to do, then have a meeting with the new owner. Be cooperative where you can, that will help them to look out for you as well as themselves.
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