My T is a private practice one in an office building. Her office itself is in a suite with 2 other offices and her area is just a very small, no staff...just a waiting room and her office itself. It is very cozy and inviting, but very professional looking at the same time. A happy medium I think.

At school when I went to T, I went to my school's counseling center. There was a building with a large-ish waiting room, and each T had their own individual office, and there was a large group room as well.