> a dedicated term for "positive real asset" in Japanese?
Some seems to use the term "富動産" to mean that, but I don't think it's catching on.
Side note: normal real assets are called "不動産" (which pronounces as "fudosan"; it originates from Immobilière in French) in Japan. It's all about puns.
It's such a huge social problem that people choose not to accept the inheritance if it involves old properties in rural areas.