Historically important and architecturally unique, the Reddick Mansion anchors Washington Square, the site of the first Lincoln-Douglas Debate in Ottawa, Illinois. Built in 1855, the Reddick Mansion is a lovely 22-room Italianate mansion was possibly the most expensive and ornate private home built in Illinois before the Civil War. Take a step back into the 19th century and visit the Reddick Mansion, where numerous rooms have been restored to their previous grandeur. The Reddick Mansion Association is responsible for the historic preservation and restoration of the Reddick Mansion.