The South End is built mostly of mid-nineteenth century bow-fronts — aesthetically uniform rows of five-story, predominantly red-brick structures, of mixed residential and commercial uses. The most common styles are Renaissance Revival, Italianate and French Second Empire, though there are Greek Revival, Egyptian Revival, Gothic Revival, and Queen Anne style houses, among several other styles. Row houses built in the last quarter of the nineteenth century, especially along the present Southwest Corridor Park show the influence of Charles Eastlake in the incised decoration on stone trim. Despite the style, a common palette of red brick, slate, limestone or granite trim, and cast iron railings provide great visual unity. Today, the South End is listed on the National Register of Historic Places and is a Boston Landmark District. It is North America’s largest extant Victorian residential district. A citizens’ group, The South End Historical Society, works with the Boston Landmarks Commission, on matters of historic preservation.