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The C. H. King Company and First National Bank were housed beside each other in a substantial frame commercial structure, known today as Yellowstone Drug. The building, constructed around 1906, is located at the corner of Main Street and Highway 20/26 in Shoshoni. It is one of the small town's earliest surviving structures due to fires that occurred in 1908. The building is significant because of the role it and its businesses played in the growth and development of the small town of Shoshoni. Its key location in the commercial area made it attractive to a number of different businesses as it housed the first lumber company in town, a grocery store, antique shop, dry goods store, a bank, and currently the famous Yellowstone Drug noteworthy for its malts and shakes.

At one time the Shoshoni Post Office was also located in the building. Fraternal organizations have used the second story for meetings and social occasions for over fifty years. The building, with its continuous use as a center of commerce in a community that has experienced significant booms and busts, communicates the important role Shoshoni has had as a service center to the surrounding agricultural, energy, and recreational community.