Farm and ranch work at Sahuaro Ranch put heavy wear on machinery, so frequent repairs were needed and were usually done here by the ranch's own employees. Believed to have been erected in the 1890s, this building began as a blacksmith shop, where one of the ranch's most valuable employees repaired and sometimes made tools, farm implements, wagon parts, and fitted and nailed horseshoes on the ranch's horses and mules. Beginning in the 1920s, as the ranch started using trucks and other mechanized farm equipment, the shop was equipped with tools and machines for internal combustion vehicles and modern farm implements, including some powered by canvas belts turned by an overhead drive shaft still visible above the concrete slab on the right side of the shop. The forge, the centerpiece of any blacksmith shop, was used to heat iron so it could be shaped and cut, and the ranch's original wooden forge remains in working order in the enclosed section of the shop.