FILE - In this Sept. 6, 2011 file photo, the World Trade Center North Tower memorial pool at the National September 11 Memorial and Museum is seen against the New York City skyline. The foundation that runs the memorial estimates that once the roughly $700 million project is complete, it will cost $60 million a year to operate. (AP Photo/Susan Walsh, Pool, File)

Associated Press
FILE - In this Sept. 6, 2011 file photo, the World Trade Center North Tower memorial pool at the National September 11 Memorial and Museum is seen against the New York City skyline. The foundation that runs the memorial estimates that once the roughly $700 million project is complete, it will cost $60 million a year to operate. (AP Photo/Susan Walsh, Pool, File)
FILE - In this Sept. 6, 2011 file photo, the World Trade Center North Tower memorial pool at the National September 11 Memorial and Museum is seen against the New York City skyline. The foundation that runs the memorial estimates that once the roughly $700 million project is complete, it will cost $60 million a year to operate. (AP Photo/Susan Walsh, Pool, File)
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