Very few. According to David T. Briggs, P.E., writing in "Beyond the Towers: Performance of Masonry", "The towers (WTC 1 and WTC 2) collapsed in less than two hours, and another building in the complex (WTC 7) collapsed later in the afternoon. These buildings had few or no masonry components."
Bricks weren't used to build it. It is made of concrete and steel.
Bricks weren't used to build it. It is made of concrete and steel.
It was built to be the tallest building in the world (at its time.)
True Fact: William Frederick Lamb. He was in a competition making the Empire State Building the tallest building in the world.
Herbert Hoover
With bricks
concrete
21,700,001
steel beams
It took 410 days, which is one year and 45 days to build the Empire State Building. That was over 200,000 hours of labor, during the course of roughly 14 months, to build what was the tallest building at that time.
It took approximately 1.5 years to build
The Empire State Building is pretty tall, man, so obviously to build one taller would take longer than the Empire State Building took.
a lot...