Premises, rooms or building spaces?
I need to find an equivalent for a term that is used to describe a part of a building that is similar to "premises", "room" or even more to just "building space" but still not quite the same.
My problem is that Russian classification is different from US or EU, so I will describe below the meaning of our Russian "premises" using a university building as an example:
Types of "premises"
"main premises" - auditorium for studying in the university;
"auxiliary premises" - canteens or cafe in the university;
"communication premises" - halls, corridors, stairs.
In the first two cases I could use the word "room" maybe, but I don't think it would work for the stairs...