 Complete the following phrase:  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 avenues 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 avenues stretch north of Plaza San Martín renamed Avenida del Libertador in 1950, to commemorate the centennial of General José de San Martíns death San Martín is known as the 