I am not a lawyer but I have been working as a coordinator for film makers and journalists who wish to videograph/photograph in Japan.
I know a contact person who is in charge of the media coverage in Nakagin Capsule tower.
I will do my best to help you film inside but I can't guarantee if you can film at this moment since the demolition work soon to be starte, so I have divided the milestone payment as follows.
If we can make it before or during the demolition work, I may also assist you as an interpreter/ film assistant while filming.
Hope to hear from you.
Regards,
Yuki
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