@PanamaPattie
I suspect the treehouse wasn't there when the OP viewed and the neighbours had it built during the lockdown summer to keep the kids amused.
I know people think this type of thing doesn't happen....
My friend viewed a house that was going through probate after an elderly lady had been in a home.
Everything went through very quickly as the house was empty possession.
Anyway they are 6 months in the house and it's summer and her in laws visit, her slightly PITA FIL is convinced that there has been a land grab as he doesn't remember the new back wall by the house backing on to the garden.
My friend knew the wall was new but she's not a gardener and wasn't stressed, the garden was approx 90ft long...she really didn't care..
Her FIL, newly retired, bored, needing a project.....was so exercised, needing a distraction.... this gave him a new lease for life🤣
Long story short he wouldn't let it go and plagued their solicitor, got his own involved.
Turns out the land grab was 13ft deep by 70ft wide.....
Solicitor only got behind it because he knew he wasn't going to get rid of him.
The funny thing is my friend never really cared.
The wall did come down and has been rebuilt. Talk of the neighbourhood....complete CF's....FIL was there like a Sargent major supervising the whole thing like it was the Berlin Wall (showing my age).
There is hardly a man, women nor child for 30 km that hadn't heard the story.
He has been dining out it for the past decade......how he prevented the crime of the century.
The lovely result was that his marriage has happily survived his retirement (not guaranteed as he's a PITA)and because of his tenacity in this matter he is regularly approached for advice on civil matters.
This is a source of enormous joy for him as he gets to tell his stories to a new audience.
My pal has her extra 13 ft but still has zero interest in gardening 🤣
I admire him. I don't like CF's.