 After Ball's death, the structure was renamed the "Edward Ball Building".Congress forced the du Pont Trust to divest itself of banking interests when they withdrew the trust's 15-year exemption from the Bank Holding Company Act of 1956.The trust sold 34.7% ownership in Florida National Banks to Charter Company in 1971 for $42M, leaving the du Pont Trust with 24.9%, below the legal definition of a bank holding company.