What you want to do: You hire a couple which creates a company which buys the property. It then setups something like a hotel keeps everything maintained, creates a garden, food storage etc. etc. etc. and keeps a more hidden area of the house compeltly private.
When he wants to visit, he has the convidence that he is under full control, but no one would start investigating the property, no one would assume he lives there etc.
And it doesn't need to be maintained just because, which will lead to missuse, fraud etc.
He could do this around the globe and put some sustainability/renewable whatever story in front of.
https://www.propertypriceregister.ie/Website/npsra/PPR/npsra...