What do you mean by "not sure how true is that"? From the article: "Traditionally, Japanese homes were demolished and rebuilt every 20 to 30 years, to implement

What do you mean by "not sure how true is that"? From the article: "Traditionally, Japanese homes were demolished and rebuilt every 20 to 30 years, to implement improved earthquake-safety technology, to provide jobs for government-favored construction companies or simply because Japanese people demanded nice new houses. As a result, there are relatively few Japanese homeowners trying to prop up the value of their houses by lobbying the government to restrict supply." Did you read the article?