An artist's rendering released by Silverstein Properties, Inc. on Thursday, Sept. 7, 2006, that shows three proposed designs for the remaining towers at the World Trade Center site. The towers would join the 1,776-foot Freedom Tower, left, in downtown Manhattan's skyline. Still to be designed are a performing arts center, a visitorscenter and a fifth tower, possibly residential, to be built just off the 16-acre site.
(Photo: AP/Silverstein Properties, Inc.)
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