The official told The Associated Press that letters seeking information on the deals should arrive today at 45 World Trade Center complexes, from Alaska to Florida. The official wasn't authorised to speak publicly about the probe and talked on the condition of anonymity.
New York Attorney General Eric Schneiderman is investigating a 1986 deal in which the Port Authority of New York and New Jersey sold the naming rights to one of its outgoing executives for use by a nonprofit organisation called The World Trade Centers Association.
"The attorney general is looking to find out how the WTCA got such a sweetheart deal on the naming rights, how much revenue the WTCA makes selling the name and how that price is set," the official said.
The Record newspaper reported in September that the Port Authority of New York and New Jersey sold the naming rights to Guy Tozzoli in his role as head of the nonprofit WTCA. Tozzoli died in February.
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A letter obtained by the AP sets an Oct. 25 deadline for responses to the World Trade Centers in cities including Houston, New Orleans, Detroit and Sacramento, California.
New York Governor Andrew Cuomo referred the case to Schneiderman on September 17.
"Using the millions of dollars in annual revenue from licensing fees paid by companies around the globe for the use of the World Trade Center brand, Mr Tozzoli received exorbitant annual compensation," Cuomo said.