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An Oakland Athletics fan gets the crowd fired up at O.co Coliseum in Oakland, Calif. on Thursday, May 29, 2014. (Kristopher Skinner/Bay Area News Group)

Many East Bay fans oppose the Oakland A's lease extension because it would hurt Oakland's chances of keeping both the A's and the Raiders, and it gives millions of taxpayer dollars to Lew Wolff and John Fisher, even though the billionaire owners still intend to move the A's to San Jose.

We thank the Coliseum Joint Powers Authority and all city and county officials for all their hard work on retaining Oakland's sports teams. Unfortunately, Wolff and Fisher have never worked sincerely with city/county leaders on finding a ballpark solution for the A's within their territory.

It would be completely inaccurate to view this proposed deal as a sign of a new era of cooperation. Far from it, Wolff and Fisher have enjoyed a sweetheart lease for nearly a decade and this extension would just make it sweeter for them, at the expense of fans and taxpayers.

Here are other reasons why we oppose the deal:

First, calling it a 10-year lease extension is not accurate. In fact, it would be almost a year-to-year lease that Wolff and Fisher can sever as soon as they're a few years into the deal, as long as they give a year's notice and pay off money owed from remaining years on the lease.

Secondly, it promises to let Wolff and Fisher keep at least $5 million in parking revenue that Wolff and Fisher owe to taxpayers, but have never paid. That term simply fails to protect taxpayers.

Also, the lease extension has a curious provision allowing Wolff and Fisher to break the lease if the Raiders and Oakland strike a deal for a football stadium at the Coliseum site. This term is unnecessary and potentially divisive, as it holds the potential to pit both Oakland franchises and their fan bases against each other. It also potentially sets the stage to force the city to choose one team over the other.

In reality, there's no reason a two-stadium solutions can't be worked out for both the A's and the Raiders at the Coliseum Complex or at other sites within Oakland city limits. Sports are supposed to bring a city together, not divide it. This divisive deal term would poison that spirit.

Lastly, the rush to approve this extension is unnecessary because the A's Coliseum lease runs through the end of next year, 18 months from now. The good news is there's still time for Oakland and Alameda County to put this deal on the shelf and renegotiate more favorable terms that better protect both the taxpayers and the East Bay's chances of retaining its storied sports franchises.

We believe that this area's elected officials have Oakland fans' and taxpayers' best interests at heart. Unfortunately, this lease extension would not protect those interests because it gives up way too much to billionaire owners who still intend to move the A's to San Jose.

That is why we urge all Oakland City Council members and Alameda County supervisors to revise the deal's terms.

If that can't be done, then they should reject the lease extension and restart negotiations for a new one.

Mike Davie and Garth Kimball are co-founders of Baseball Oakland, at baseballoakland.com.