Well, of course there was insurance taken out on the building shortly before the WTC attacks…
“On April 26 of 2001 the Board of Commissioners for the Port Authority of New York and New Jersey awarded Silverstein Properties and mall-owner Westfield America a 99-year-lease on the following assets: The Twin Towers, World Trade Center Buildings 4 and 5, two 9-story office buildings, and 400,000 square feet of retail space.”
If you had just taken over a lease on a bunch of buildings you would file for insurance as well.