reopened after preventive measures had been installed.) Arts and culture Bass Performance Hall - Bass Hall is the permanent home to the Fort Worth Symphony Orchestra, Texas Ballet Theater, Fort Worth Opera, and the Van Cliburn International Piano Competition and Cliburn Concerts. Convention Center The Fort Worth Convention Center includes an 11,200 seat multi-purpose arena. Notable buildings The Tower, formerly the Bank One Tower, was severely damaged by a F3 tornado on March 28, 2000. It was converted into a residential tower in 2005. Before the redevelopment, it was covered in plywood and metal panels, and considered to be demolished. It now has a new facade and a new top feature that makes it the fourth tallest building in the city. City Center Development features two twin towers, the 38-story D.R. Horton Tower (1984) and the 33-story Wells Fargo Tower (1982). From the top, they are shaped like pinwheels. The Hilton Fort Worth opened in 1921 and is where U.S. President John F. Kennedy last stayed before he was assassinated in Dallas. Government and infrastructure Fort Worth City Hall is located at 200 Texas Street and was constructed in 1971. The previous building to house those functions in located at 1000 Throckmorton Street and is now known as the A.D. Marshall Public Safety and Courts Building. The Fort Worth district of the United States Army Corps of Engineers is downtown. The United States Postal Service operates the Downtown Fort Worth Post Office at 251 West Lancaster Avenue. The Texas Second Court of Appeals is in the Tim Curry Criminal Justice Center in Downtown Fort Worth. Tarrant County Courthouse stands at the north end of Main Street. It has been remodeled over the years. Economy Downtown Fort Worth is the central business district of the city, and is home to many commercial office buildings, including four office towers over 450 feet tall. Radio Shack has its headquarters in Downtown Fort Worth. In 2001 Radio Shack bought the former Ripley Arnold public housing complex in Downtown Fort Worth for $20 million. The company razed the complex and had a corporate headquarters campus built after the City of Fort Worth approved a 30-year economic agreement to ensure that the company stayed in Fort Worth. The company sold the building and, as of 2009, had two years left of a rent-free lease in the building. The company intended to make $66.8 million in the