Twin Falls County Courthouse. Head northeast on Shoshone street and turn left onto 4th Ave North. To your right, you will see the Twin Falls County Courthouse, a three-story neo-classical revival building constructed of yellow brick with stone columns and cornices. It is distinguished by a round arched entry with a pedimented portico supported by lonic columns. The original mahogany and oak interior is still intact. It was the tallest building in Twin Falls (constructed in 1909-1910) and boasted the city's first elevator. Local architect C. Harvey Smith designed this building.