Built in 1929, the Haynes Administration Building reflects a shingle style of architecture, comprised of organic wood materials that blend with the natural surroundings of Mammoth Hot Springs in Yellowstone National Park. While the design is a departure from the traditional revival style customary in the Park, the organic application of raw materials relates the structure to the unique context of Yellowstone. For four decades, the building served as a retail facility for tourists, but fell into a state of disrepair due to neglect. A rehabilitation effort transformed the abandoned space into an administrative office for the Park concessionaire while preserving its original historic character. The structure was upgraded to satisfy seismic and gravity load requirements, as well as current building codes, systems, and ADA compliance.