I don’t really get the nostalgia angle as it seems as many of those who are into this kind of thing are too young to have ever been in such a space, let alone worked in one. I’ve worked in a place like this that was well past its prime and though uncanny, it’s certainly not creepy. The illusion of infinitely twisting, identical corridors simply doesn’t hold up when you’re actually in a space like this, but only works…
Day vs. Night are what makes the difference. The sprawling suburban office complex from the 70s was, like you said, just boring and a bit oppressive during the day. At night though, a sea of cubicles. Endless hallways. Nothing but blackness outside the windows. Lights are all on motion detectors so only your area is lit. And only lit for a time. Eventually you'd have to stand up to make the lights switch back on. And…
So instead of street lights you get fires in trash cans are whatever casting light upwards.
It’s creepy in the same way as someone lighting their face by holding a torch near their chin.