This particular building, Founders Hall, had undergone major renovations from when I was originally a student there, and I don't think I had noticed it before. But, I did that day and took a picture. I think the glass may have been "a keeper" from the renovations and it was reincorporated into the new architecture. It's at the top of the main stair-well when you enter the building from the front.
Distinctly in the middle of the piece is a fleur-de-lis.

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