After World War II, the Aluminum Company of America (ALCOA), which was established in Pittsburgh in the 19th century, proposed to move to New York City. Banker Richard King Mellon aimed to block the move. In 1949 he proposed a new downtown headquarters building for ALCOA (now the Regional Enterprise Tower). As a bonus, it would have a nearby underground parking garage capped by a public plaza: Mellon Square, built in 1953-55, designed by Mitchell & Ritchey, landscaped by Simonds & Simonds, and paid for by Mellon family foundations. The Mellon family through various foundations gave a total of $4 million ($ in dollars) to help create the park, $3.5 million for property acquisition ($ in dollars) and $500,000 ($ in dollars) to build the parking garage and flora. On September 28, 1953 Pittsburgh City Council officially renamed the block "Mellon Square". Upon completion, Mellon gave the property to the City of Pittsburgh. Mellon Square is named in honor of Mellon's father and uncle, Richard Beatty Mellon (1858-1933) and Andrew Mellon (1855-1937). A dedication marker on ground level says the following: "Mellon Square is dedicated to the memory of two brothers, Andrew W. Mellon and Richard B. Mellon, their leadership, civic spirit and philanthropy advanced immeasurably the welfare of this community".