its construction had already begun before the use of asbestos was banned in 1971, so spray-on asbestos fire retardant was used up to at least the 40th floors in both towers (64th in the North Tower) & a different insulating material was used for the remaining floors
http://www.maacenter.org/jobsites/WTC/asbestos.php
the Port Authority was refused permission to have the towers demolished due to the toxic dust produced:
http://www.mesotheliomasos.com/newsWTCcoroners.php
the cost of the rennovations was $1 million
& the only other way, was to dissemble it floor by floor - the scaffolding ALONE was more than $1 million!
that was the reason why the WTC was still there on 9/11
despite all this, silverstein decided to lease the WTC 6 months before 9/11 & promptly insured the buildings against 'terrorist' attacks. he put a down-payment of $124 million for the lease (on a $3.2 billion complex) then claimed for two separate attacks (2 planes) & was rewarded $7 billion!
he sure was lucky....
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