Located inside the Doty Fine Arts Building, more specifically inside the Fine Arts Library (only open until 6PM)
This staircase similar to the one in the Art Buidling is a transitional space that lets you move through the building vertically. Its attachment to the Fine Arts Library is important as it acts as a marker (to help find things).
On the 5th floor, Grab a book from one of the many shelves. Enter the nearest stairwell entrance and go down a floor, return to the 5th floor and return the book.