There currently is no debate regarding which building is the world's tallest
skyscraper but there is debate as to which building was actually the first skyscraper. One
building that many consider to be the first skyscraper is the Home Insurance building in
Chicago, Illinois. It was built in 1884 and was ten stories tall when it was first built, but
later additions made it twelve stories. It was built after the Chicago Fire of 1871 which
destroyed many buildings in Chicago. In response to the fire, the Home Insurance building
had a fireproof frame made of metal and it was that unique frame that is the reason many
consider it to be the world's first skyscraper. Unfortunately, the historic building is not still
standing today because it was demolished 47 years after it was built. What is the central idea of the passage?