At Lumon, the Innies are intentionally made to feel unmoored from time and space, and that bleeds into the town a bit too. We wanted the town to feel like an extension of Lumon in a way.
Dan Erickson, Reddit AMA
Severance takes place in a company town (Kier, PE) largely sealed off from the rest of the world throughout the 20th century. As a result, it is a sort of time capsule of significant architectural styles as well as design sensibilities that otherwise have moved on in the world at large. This page attempts to document some of the real-world designs and designers which likely inspired the look and feel of Severance.