The Seropian was a center for active retirees in Chicago, Illinois in the United States on Earth. This building is significant for the fact that, before her death, it housed Avery Johnson's much loved Aunt Marcille.
- The name is likely a tribute to Alexander Seropian, former president and CEO of Bungie.
- From the vague details in the book it seems to have a lower level where retirees can exercise and talk, and an upper level where retirees reside.
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