The Ellwood House was built as a private home by barbed wire entrepreneur Isaac Ellwood in 1879. It is located on First Street in DeKalb, Illinois, United States, in DeKalb County. The Victorian style home, designed by George O. Garnsey, underwent remodeling in 1898-1899 and 1911. The house was originally part of 1,000 acres (4 km2) which included a large stable complex known as "Ellwood Green." Isaac Ellwood lived here until 1910 when he passed the estate to his son, Perry Ellwood.