From the record
“Fraternity Hall is a historic building located in Elkhorn, Montana. It was originally used as a dance hall and meeting place for various fraternal orders.”
Wikipedia article Fraternity Hall, CC BY-SA 4.0.
One of 14 National Register listings published here for Jefferson County · listed in 1975 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service