Changes in national politics did not rename or adversely impact the avenue, which was further widened and improved by Mayor José Guerrico in 1931, adding new medians to delimit bus and taxi lanes, and giving the boulevard its approximate current layout. The avenue's eclectic architectural selection was added to by rationalist buildings such as the Comega (1930) and the 42-story Alas (1950), which remained the tallest in Argentina until 1995. President Juan Perón, who had the Alas built, ordered the avenue's stretch north of Plaza San Martín renamed "Avenida del Libertador" in 1950, to commemorate the centennial of General José de San Martín's death (San Martín is known as the Liberator of Argentina and Perú). Zoning changes encted in 1966 allowed the development of the Catalinas Norte business park at the avenue's northern end, bringing with it the International style to the avenue's cityscape. Leandro Alem remains one of the city's most valuable commercial real estate addresses, and its last undeveloped lots, municipal property totalling no more than 15,000 m² (160,000 ft²) and estimated to be worth around US$80 million, were publicly proposed for sale in 2009.