Earlier today, with a fellow MLIS candidate, I visited:
…which is now known as:
We checked out the former Carnegie-grandeur…

…and imagined what the library once looked like:

The library’s stacks used to be where the support poles now reside. (Supporting the glass-floor mezzanine).
Support poles now replace where the stacks resided. You are looking at the underside of a glass-floor mezzanine!
Finally, we visited the feature exhibit: