At least he has the sense to have people live there and take care of it. Every so often I watch youtubers that explore abandoned houses. Most of them are old and small, but every so often there will be a huge mansion that isn’t that old.
I saw one that used to be John Gotti’s mansion. Looks like people were trying to work on it, and lots of stuff remains in the home.
https://www.youtube.com/watch?v=UetTosPXbzs
This has been some years ago. I don’t remember all the details, but there was a house built in a higher end north west suburb of Chicago. There was some sort of dispute with the city or the builders and the people never moved in. It took around 8 years for the roof to start caving in.