Henry B. Clarke House
Clarke House may have been modeled on the home of William B. Ogden. The Clarke house is often described as the oldest surviving house in Chicago, although part of the Noble-Seymour-Crippen House in the Norwood Park neighborhood was built in 1833. (However, Norwood Park was not annexed to Chicago until 1893.) The Clarke House was designated a Chicago Landmark on October 14, 1970. It was added to the National Register of Historic Places on May 6, 1971.
Harker Hall
Harker Hall, also known as the Chemical Laboratory, is a historic building on the campus of the University of Illinois at Urbana–Champaign in Urbana, Illinois. Built in 1877, the building originally served as the university's chemical laboratory. Architect Nathan Clifford Ricker designed the Second Empire building, which originally featured a mansard roof. In 1896, a lightning strike set the roof on fire, and architect James White replaced it with a hip roof. The building was named Harker Hall in honor of Oliver A. Harker, who served as dean of the university's law school from 1903 to 1916. Until it stopped hosting classes, the hall was the oldest classroom building at the university.