The city's industrial base continued to grow in the post-war era partly assisted by the area's first agency entirely devoted to industrial development, the RIDC. Jones and Laughlin Steel Company expanded its plant on the Southside. H.J. Heinz, Pittsburgh Plate Glass, Alcoa, Westinghouse, U.S. Steel and its new division, the Pittsburgh Chemical Company and many other companies also continued robust operations through the 1960s. 1970 marked the completion of the final building projects of Renaissance I: the U.S. Steel Tower and Three Rivers Stadium. In 1974, with the addition of the fountain at the tip of the Golden Triangle, Point State Park was completed. Although air quality was dramatically improved, and Pittsburgh's manufacturing base seemed solid, questions abound about the negative effects Urban Renewal continues to have on the social fabric of Pittsburgh. Pittsburgh, however, was about to undergo one of its most dramatic transformations.