From the record
“The Ralston Opera House occupies the second floor of the building located at 501-503 Main St. in the town of Ralston, Pawnee County, Oklahoma, an arrangement that was typical in smaller-town opera houses in Oklahoma. The building was constructed in 1902 out of native sandstone, and the first floor remained commercial space.”
Wikipedia article Ralston Opera House, CC BY-SA 4.0.
One of 13 National Register listings published here for Pawnee County · listed in 1987 · category: Building · built in 1902.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service