These are the plans relating to the addition made in 1873 that extended the building from the original rectangular plan.
Encylopedia Brunoniana- "An addition was constructed on the east side of the building in 1874. In 1875 the portraits were moved to the second story of the addition, new glass cases were installed in the old building and the first floor of the addition, and the basement of the addition was given over to Professor J.W.P. Jenks’s weekly voluntary class in taxidermy."
