There definitely are places in Tokyo (on/inside the Yamanote line) for way under 80000 with more space. Yup, they will be older but often you can find ones tha

There definitely are places in Tokyo (on/inside the Yamanote line) for way under 80000 with more space. Yup, they will be older but often you can find ones that have been fully renovated. Sure, there's the earthquake issue but something tells me those cardboard boxes aren't much better at safety. This is only anecdotal but my impression is that everybody wants to live in a newly built house and then after a few years move again into another flat in a newly built house. So, there's at any point a whole lot of empty and just fine places in Tokyo. I just wish their rents would drop further.