To preserve some of the historic character of the town, Seguin became one of the state's first Main Street cities, and the downtown district was placed on the National Register of Historic Places. Fine homes by leading architects J. Reily Gordon, Solon McAdoo, Leo M.J. Dielman, Atlee B. Ayers, and Marvin Eickenroht dating from the late 19th century and the first half of the 20th century can be found on many streets. However, the city does not have any officially designated historic residential districts.