It’s important to ensure that these signs are clearly visible and placed in strategic locations throughout the office. Archived from the original on 2021-07-21. Retrieved 2021-07-21. Since the Governor has no official residence, the expression “corner office,” rather than “Governor’s mansion,” is commonly used in the press as a metonym for the office of Governor. The cranes could actually lift themselves higher, using heavy hydraulics, as the floors were finished. The crew lifted the steel sections into place using four large cranes (four per tower), mounted to long steel structures fitted inside the tube structure. First, the crew built the steel framework of the inner core to a particular height and then assembled the perimeter wall around it. Then they poured in concrete from the bottom of the trench while pumping the slurry out through the top. In this way, they built solid, steel-reinforced concrete walls underground. To finish each floor, the crew would pour concrete over the metal surface and top it off with tile. The floors also came in preassembled sections, consisting of 32-inch (81-cm) deep trusses topped with a corrugated metal surface.

While the crew kept building upward, other workers started to flesh out the floors below, down to installing blinds and painting the walls. To ensure that walls of skyscrapers didn’t block all light from reaching the street, the city passed a resolution in 1916 dictating that all skyscrapers would have an overall pyramid shape. Among other things, it would have compromised the stability of other buildings along the shore. They ended up digging up more than 1 million cubic yards (764,555 cubic meters) of fill, which they dumped in the Hudson, extending the shore. With the bathtub in place, the world trade center’s construction crew could start digging down to the bedrock to lay the two buildings’ foundation support. Digging to this level is no simple task, obviously, but it’s par for the course in skyscraper construction. The construction process worked from the inside out. The process was pretty simple, at least conceptually. They repeated the process with 152 framework segments, each measuring 22 feet (6.7 m) across, to form a large box measuring four city blocks by two city blocks (about 500 x 1,000 feet, or 152 x 304 m).

Once they finished a 22-foot (6.7-m) section of trench, the crew lowered a narrow, seven-story steel framework into the hole. After the steel structure was in place, the crew attached the outer “skin” to the perimeter – anodized aluminum, precut into large panels. The solar panels comprised a total of 34,800 solar cells and produced 620 W of power at Mars. The buildings required a massive amount of steel – some 200,000 tons total – but the construction site only had room for a little bit at any one time. In addition to utilizing an unconventional structural design, the Twin Towers were also an aesthetic departure from the older buildings in New York. The Port Authority could build such tall towers because they had a huge plot of land with a large, open-area plaza. Business owners and residents were upset at being forced out of the construction site; citizens all over the city wondered why the Port Authority was sinking so much money into the project (estimated at more than $1 billion, the equivalent of about $6.8 billion today), apparently at the expense of public transportation facilities; environmentalists questioned some of the construction practices; and several prominent architectural critics said the towers were simply too big and ostentatious.

A number of businesses actually moved into their new WTC offices years before the towers officially opened. From its conception all the way through its completion, the WTC project was wildly unpopular with many New Yorkers. The grand opening was certainly a celebratory day for the Port Authority, design team and construction crew, but the WTC complex had a long road in earning the city’s acceptance. Instead, the Port Authority decided to use the unconventional “slurry trench method,” previously employed mainly in subway construction. According to the construction schedule, the Port Authority would ship the steel pieces from the yard to the site exactly when necessary – smaller pieces went by truck and larger pieces by tugboat. In this system, all the steel was transported from the manufacturers to a giant railroad yard in New Jersey. Every major piece of steel had a long ID number, indicating where and when it would be used. Boosted by prominent appearances in several movies – such as the 1976 “King Kong” remake, Woody Allen’s “Manhattan,” and the “Superman” movies – the Twin Towers gained widespread recognition as a piece of New York. This continued, section by section, as the towers climbed higher and higher.