These plans are of the 1904 addition that was added to the south-east corner of the building. It is the section where today there is a separate entrance on the basement level to the Writing Fellows Program.
Encyclopedia Brunoniana- "In 1904 a small addition on the south side of the building replaced the lean-to where live animals were kept. The three-story addition provided a place for the animals on the ground floor, an aquarium on the second floor, and a room for preparing skeletons on the third."

George St elevation 1904

East elevation 1904

Basement and roof 1904

First and Second floors 1904

Cross sections 1904

architectural plans- the physical modifications to RI Hall