campus is home to a rich diversity in architecture and urban planning with old and modern buildings that showcase the architectural development of the past 120 years in Puerto Rican architecture. La Torre and the Quadrangle In 1936, architect Rafael Carmoega, working under the Puerto Rico Reconstruction Administration (PRRA), designed the distinctive University of Puerto Rico clock tower based on the 1924 Parsons Plan. The iconic university clock tower was built in 1937 and christened as the Franklin Delano Roosevelt tower, in honor of the president and his interest in the building of the university. La Torre (as The Tower is nicknamed in Spanish) is located at the entrance of the Román Baldorioty de Castro Building. Right below the tower there is a monument to the nations of the Americas portraying the coats of arms of all American states within a bronze circle, as a symbol of the Panamerican Union. Under the supervision of architect Rafael Carmoega, a group of local architects designed what is known as El Cuadrángulo (The Quadrangle), a plaza-like quadrangle. The campus's central quadrangle and tower were listed on the National Register of Historic Places in 1984. Campus architecture The University of Puerto Rico was established in Río Piedras in 1903. The first buildings were the Normal School (1902), the Model School (1903), and the Principal's Residence (1903), next to the Central Road (today Ponce de Leon Avenue). Over the years, the development of the university occurred somewhat spontaneously. In 1908 the architectural firm of Clark, Howe and Homer designed a new façade for the Model School in the California Mission Style. In 1909 a milk processing building was constructed in an agricultural area, east of the academic center. Arts and Crafts’ Workshop buildings, a Library and a Gymnasium were planned, as well as the grand stand and the fence (all demolished now). In 1912 construction began for the Memorial Hall (Baldorioty Building) and buildings for the Law School and the School of Pharmacy were in the works in 1918. In 1924 the Chicago firm of urbanists Bennett, Parsons and Frost were contacted to design a master plan for the future development of the university. It wasn't until 1935, with the establishment of the Puerto Rico Reconstruction Administration (PRRA) and the large sum of federal funds that it invested for public works in Puerto Rico, that the partial design and construction of the so-called Parson Plan