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I know there tends to be a back your boy mentally to this thread, but if someone's got a tree that's fucking up their neighbour's building, then a more appropriate response might be to talk to the neighbour directly (without the landscaper tenant around) and ask to have a look at the damage.
It's a tree ffs. They can buy another and plant it further away.
Edit: the reason for not wanting the landscaper involved is because it has nothing to do with them and you have no idea what skills or knowledge they actually have. It also smells a bit like a blag where he'll imply that he'll do it for free, then actually charge you and say "lol of course I want to be paid, you don't work for free do you?"
Tell him to do one.
If it's on your property there's nothing he can do. He can trim back the bits that cross the boundary line but that's about it.
I'd ask to see the problem, but I think it would a decision between you and your neighbour.
Edit - you're supposed to notify your insurers if you have a tree causing damage to a neighbouring property.