Pinehill InnThe Pinehill Inn, or just Pinehill, is a National [Register of Historic Places] listed house in the Ogle County, Illinois county seat of Oregon. Pinehill joined the Register in July 1978.ArchitecturePinehill was built in 1874 by William Judd Mix. The brick, wood and limestone structure stands on five acres of land and is cast in the Italianate style of architecture.SignificancePinehill was listed on the National Register of Historic Places on September 1, 1977, for its significance in the area of architecture.