 The rear elevation of the "museum" wing has a metal finial and a battened timber screen to the gable, similar to the front elevation however without any of the decorative timber detailing and trim.Paired lancet windows with leadlight panels are located in the gable above a lean-to addition, which consists of an early section at the western end (possibly part of the original "museum" wing), and later enclosures at the eastern end.The lean-to has louvred glass windows as well as a row of fixed glass high level windows.