A Greco-Roman annex building was built just west of City Hall in 1909. It was designed by Cornelius Curtin. An 1891 firehouse, the next building down Jefferson Street, was integrated to the complex in 1937. The building housed the city's tax collectors and quickly acquired the name "Sinking Fund Building." By the late 20th century it housed the Inspections, Permits and Licenses Department, which moved out in 2004. All three buildings were added to the National Register of Historic Places as the City Hall Complex in 1976.