The Tokyo Metropolitan Government Building houses the headquarters of the Tokyo Metropolitan Government.

In the novel number9dream, it is referred to as the Metropolitan City Office by Eiji Miyake during an elaborate fantasy sequence. Pretending to be Ran Sogabe,  a “Goldfish Pal” who has come to PanOpticon to service the aquarium of the law firm Osugi and Bosugi, Eiji Miyake claims that he cannot come back tomorrow because he will need to tend to “ninety angel-fish at the Metropolitan City Office.”