The core of the complex was built between 1975 and 1985 , at a cost of $ 400 million ( equivalent to $ 2.27 billion in 2018 ) . During its existence , the World Trade Center experienced several major incidents , including a fire on , 1975 , a bombing on , 1993 , and a bank robbery on , 1998 . In 1998 , the Port Authority of New York and New Jersey decided to privatize it by leasing the buildings to a private company to manage . It awarded the lease to Silverstein Properties in
bombing
1993 World Trade Center bombing
World Trade Center (1973–2001)