"The five million yuan that Bo Xilai is accused of embezzling was money from the Communist Party headquarters to pay for a villa for then president Jiang Zemin," Hong Kong-based South China Morning Post quoted sources with knowledge of the deal as saying.
Bo's handling of the payment while serving as Liaoning governor in 2002 was the sole allegation of embezzlement detailed at his trial in the Jinan Intermediate People's court last month.
But two sources with close ties to elite Dalian politics told the Post that the General Office of the party's Central Committee sent the money to the seaport city upon its completion of a holiday home for Jiang, who was then nearing retirement as president and party chief.
The money was later allegedly funnelled to Bo's wife Gu Kailai via a law firm with Bo's approval, court papers said.
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"Jiang expressed his love of the port city during his visit," one of the sources said. "Bo wanted to butter him up to get promoted by taking the opportunity to build the villa."
Though retired in 2002, Jiang continued to be most influential figure in the party. Much of the current leadership under President Xi Jinping is believed to owe allegiance to him.
Aside from embezzlement, Bo is awaiting judgment on charges of bribery and abuse of power.
The second source confirmed the story and said the money was allocated to Dalian with the consent of General You Xigui, Jiang's chief bodyguard and former director of the Central Security Bureau.
Local governments often cover the expenses of visits by top leaders and claim reimbursement from the central government. It is an open secret that some also build or renovate facilities for retired state leaders.
Sources who either attended or were briefed on the proceedings at Bo's trial said prosecutors provided no additional details about the project, other than those included in the publicly released transcript.