One week after the Oakland Athletics finalized an agreement on a 10-year extension to play at O.co Coliseum, the Raiders are in talks to have the aging stadium demolished in 2015 to make room for a new home, the San Francisco Chronicle reported Wednesday.

Oakland's O.co Coliseum is the lone facility shared by a Major League Baseball club and a team in the National Football League.

According to the newspaper, the talks, revealed in a memo to Mayor Jean Quan from planners of the city-backed Coliseum City sports-retail project, stunned officials of the Oakland-Alameda County Coliseum Authority -- the agency that reached an agreement last Thursday to keep the A's in the existing ballpark for a decade.

Representatives of Coliseum City expect to reach a deal with the Raiders by the end of the summer that would lead to the opening of a new football stadium on the existing site by 2018, the Chronicle reported.

"It will be critical to demolish the existing stadium in 2015" if the project is to be finished on time, Coliseum City attorney (and local political powerhouse) Zachary Wasserman said in a July 2 memo to Quan and City Administrator Henry Gardner, according to the newspaper.

The stadium is controlled by the Coliseum Authority, whose chairman is Nate Miley, who is also the County Supervisor. He told the Chronicle that demolishing the Coliseum was "totally preposterous ... we still owe about $180 million on the stadium. This is either smoke and mirrors, or they're on crack."