English: Built between 1919 and 1921, this Collegiate Gothic Revival-style building was designed by Miller, Fullenwider and Dowling and named for the former President of the University of Tennessee, Brown Ayres (1856–1919), whom served as university president from 1904-19. The building replaced the Old College Building, built in 1828, as well as the East College and West College buildings, which were built prior to the US Civil War and were among the oldest buildings on campus, and marked the start of a major campus redevelopment program that extended well into the mid-20th Century that replaced most of the 19th Century buildings with larger Collegiate Gothic Revival-style buildings that define the campus today, with only the South College Building remaining from the time prior to this redevelopment. The building features a central iconic Gothic Revival-style tower with limestone trim, clock faces, an open belfry, and crenellated parapet, which sits on the central wing of the building which features a low slope roof surrounded by a parapet, and entrances on the front and rear with portals and decorative surrounds below multi-story oriel windows. The central wing is flanked by two side wings which feature red shingle gabled roofs, large banks of windows, limestone trim, and several side entrances to the building. Ayres Hall presently houses the Mathematics Department of the University of Tennessee and was rehabilitated between 2008 and 2011, adding several features to the building that were originally planned but never implemented. The building was listed on the National Register of Historic Places in 2012.