The availability of urban redevelopment grants beginning in the 1950s became an important funding resource for expansion of the university. The size of the campus has continued to expand, with the University constructing new building as well as repurposing older buildings located in the area. As of Fall 2015, nearly 30,000 students were enrolled at Wayne State: over 18,000 undergraduate students and over 8000 graduates students, with the remainder enrolled in professional programs. The Art Center (or Cultural Center) is centered on the Cultural Center Historic District: the Detroit Public Library, the Detroit Institute of Arts, and the Horace H. Rackham Education Memorial Building. The district contains several cultural attractions. The library and art museum were built in the 1920s, heralding a City Beautiful movement in Detroit that aimed to establish the area along Woodward as the cultural center of the city. Wayne State University, then housed in the former Central High School, began offering four-year degrees. These institutions formed a core area that attracted other public-oriented institutions to the area, including several music schools, the Merrill-Palmer Institute, the Detroit Historical Museum, and the College for Creative Studies. The Charles H. Wright Museum of African American History, the Detroit Science Center, and the Museum of Contemporary Art Detroit also are located in the Art Center area. The Art Center portion of Midtown also contains substantial residential areas, including the East Ferry Avenue Historic District and scattered late-19th century homes to the east of the Detroit Institute of Art. These neighborhoods have been infilled with townhomes and other residential developments and revitalizations. South of Wayne State University, the North Cass (or Cass Farm) area contains a substantial number of multi-unit apartment houses, many mixed with earlier single-family homes. This area has been heavily influenced by the expansion of Wayne State, with some of WSU's campus extending into the northern section of North Cass, and much of the residential housing stock taken up by Wayne students. There are also a number of commercial buildings, particularly along the Cass Corridor just west of Woodward. Many of these support commercial businesses, and an independent retail study by the University Cultural Center Association has shown that the number of independent retail outlets in Midtown Detroit is increasing. The north Cass section also has a smattering of industrial buildings dating from the automotive heyday of Detroit. Many of these, such as the Willys Overland building, have been or are being converted into residential loft space. The Detroit Medical Center was organized in 1985 as a union among several hospitals: Harper University Hospital, Grace Hospital, Hutzel Women's Hospital, and Children's Hospital of Michigan.