fl the blank space: where is the office?

... an office is an office is an office.

and yet the hint of suspicion arose in them again when a balding young man walked past for a second time, and even as they made as if they were outside and above it all, that uncanny, unheimlich feeling took root in them all the same, that haunting feeling that the entire building was watching them. or perhaps they weren't being watched, but instead were being made to feel as if they were being watched? they'd arrived right on time, after all, even if they had come separately, and though an office worker saddled with lots of work can't be expected to drop everything to receive just anyone who steps in off the street-if indeed this was an office, and it certainly looked like one, and if indeed this was where they'd been summoned for an appointment-why the long wait?