When walking into the main square El Zócalo, a first-time visitor to Mexico City in 1940… would have been surprised to notice that while all the buildings on the square were built on the square’s level, the theater stood at that time 6 ft. (1.8 m) below it so that one had to go down a staircase to enter. But upon inquiring of a Mexican friend about this unusual feature, the visitor would have learned that like the other Alameda buildings, the theater had been built on grade, on the loose sand permeated with the water of ancient Lake Texcoco, [and] the enormous weight of the palace had slowly squeezed the water out from under it, compressing the soil and lowering the theater in due time….
But if our visitor had returned to the Alameda in the 1960s, he would have noticed, to his greater surprise, that the National Theater had moved again. One still entered it by way of a staircase, but now one went up, because the theater was 6 ft. (1.8 m) above the level of the square, having risen, undamaged, 12 ft. (3.6 m)…. Yes, a number of tall buildings had been erected around the square since he had been there twenty years earlier. This time the weight of the skyscrapers had squeezed the water out from under their foundations and pushed it back under the theater.