> I’ve worked in a place like this that was well past its prime and though uncanny, it’s certainly not creepy.

That's kinda more what the german concept of "unheimlich" is like. Even though it usually gets translated to English as "uncanny", it's more literally "un-homelike", when the familiar (home) turns unfamiliar (un-homelike) in an unexpected way. A common idea in that would be something like the discovery of a hidden room in your house, especially in some weird non-euclidean way ("it's bigger on the inside" for example, like a tardis).