In honour, a Godzilla-size head towering 52 metres (171ft) above ground level was unveiled at an office of Toho, the studio behind the original 1954 film.
Toho is shooting a comeback movie this year after a decade-long hiatus.
Godzilla’s standing has had its ups and downs but its stature has been reinstated after a Hollywood version, released last year, was a global hit.
At an awards ceremony next to the giant Godzilla head, an actor in a rubber suit waddled over to the Shinjuku mayor.
But a Toho executive accepted the residency certificate in Godzilla’s place as the suit’s claws are not designed to grab anything.
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