Yamasaki devised the plan to incorporate twin towers; Yamasaki's original plan called for the towers to be 80 stories tall, but to meet the Port Authority's requirement for 10,000,000 square feet (930,000 m2) of office space, the buildings would each have to be 110 stories tall.
Yamasaki je smislio nacrt da se Blizanci pripoje; Yamasakijev izvorni nacrt je pozivao da visina zgrada bude 80 katova, ali kako bi ispunio zahtjeve Lučke uprave za 930 000 m2 poslovnog prostora, svaka zgrada je morala biti visoka 110 katova.