The Lincoln-Herndon Law Offices at 209 South Sixth Street occupy the third floor of a brick commercial building directly across from the Old State Capitol. Lincoln's law practice was the foundation of his financial stability and his reputation in Springfield, and the office has been restored to its 1840s–1850s appearance with period legal books, documents, and furniture.
Guided tours begin in the federal courtrooms on the floors below, which have also been restored and contain displays on 19th-century legal practice. The building is a relatively quick visit — about 45 minutes — but it adds essential context to the Lincoln story for anyone who wants to understand his life before the White House. The site is operated by the Illinois Historic Preservation Agency; entry is free.