The Historic Park Inn Hotel and City National Bank are two adjacent commercial buildings located in downtown Mason City, Iowa, United States which were designed in the Prairie School style by the renowned architect Frank Lloyd Wright. Completed in 1910, the Park Inn Hotel is the last remaining Frank Lloyd Wright-designed hotel in the world. The City National Bank is one of only two remaining Frank Lloyd Wright-designed banks in the world. It was the first Frank Lloyd Wright-designed project in the state of Iowa. (wikipedia.org)