I am sure that this is happening, but has the World Trade Center ownership group (whoever they are, public or private) been sued for the 9/11 attack?
If so, on what grounds? I can see a lawsuit for the 1993 bombing because of security measures, but there was no realistic defense for this. But I know that this concern has been sued.
The World Trade Center was/is owned by the Port Authority of New York and New Jersey. In April 2001, Silverstein Properties, Inc., and Westfield America, Inc. signed a 99-year lease on four of the WTC buildings, including the Twin Towers.
One day before the first anniversary of the attacks, the legal deadline for filing suits, about 1,000 families of victims filed suits against the Port Authority of New York and New Jersey, United Airlines, American Airlines, and Boeing Co.
According to a news story at the Business Insurance Daily News website,