“You just inherited a dilapidated, crumbling-down grand mansion in the countryside. Assuming money is no issue, what do you do with it?”
I’d sell it away. Do you know about ordinary Japanese houses? Many people think it’s better to rebuild every generation. Japanese summer is hot and humid. That damages the houses. Inheriting an old house in the countryside involves a lot of maintenance cost. In declining regions, it also means your house is most likely sold for a very low price. Even if your house is relatively new. A big house of the former owner’s special idea, older people in rural areas tend to like a Japanese traditional house with big tatami rooms, can be most inconvenient to younger couples who are seeking also a reasonable one. Also because people prefer new-built houses in Japan, the house prices decline almost immediately in the market after the owner moves in. Land prices are also declining in rural areas.