Ụlọ elu ahụ dị n'ebe ugwu na One World Trade Center malitere na 1966 na Ụlọ elu South na Two World Trade Center. Mgbe e wuchara ya na 1972, 1 World Trade Center ghọrọ ụlọ kachasị elu n'ụwa ruo afọ abụọ, na-akarị Empire State Building mgbe ọ chịrị afọ 40. Ụlọ elu North dị mita 417 n'ịdị elu ma gosipụta antenna telivishọn ma ọ bụ mast nke e wuru n'elu ụlọ n'afọ 1978. Site na mgbakwunye a, ebe kachasị elu nke North Tower ruru mita 1,730 (ụkwụ 530). Ụlọ elu Sears nke Chicago, nke emechara na Mee 1973, ruru mita 1,440 (ụkwụ 450) n'elu ụlọ. Ajụjụ: Gịnị bụ ịdị elu nke ụlọ elu North Tower?
417 m