World Trade Center Facts: 1) It took 8 years to build the WTC buildings. 2) Each building had it's own zip code- 10047 and 10048 3) Each floor was 50,000 square feet 4) The towers were different heights- WTC 1 was 1,368 feet tall. WTC 2 was 1,362 feet tall. 5) There were 43,600 windows. 6)the buildings had 20,000 elevator doors. 7) There were 828 emergency doors. 8) American Express, Bank of AmericaCharles Schwab, were a few of the companies headquartered hear. 9) By 9 am each weekday morning the buildings had an average of 35,000 employees at their desks 10) On a clear day, it was possible to see for 45 miles in every direction from the observation deck. 1)Every major US airline had ticket offices inside the WTC. 12) It is the first skyscrapper in the world destroyed by terrorists.