As mentioned in my other post, the original portion of the building has now been divided into classrooms. Here's the main hall that runs down the length of that portion.
Each classroom has one of the windows, though; and I believe those are original.
On the side of the building is this lobby. You can head downstairs (where there's another floor of classrooms, up to the main floor, or up the staircase that winds around a bit.
At the top is this small room, with original doors and panels remaining.