(CBS) — Mayor Emanuel — reacting to the latest move by the Friends of the Parks on the Lucas Museum — says it’s time the group stopped “negotiating among themselves.”

In the latest demand from the Friends of the Parks, the organization reportedly wants 5 percent of all revenue from the Lucas Museum to go to neighborhood parks.

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In exchange, the organization would drop its objection to the Lucas Museum going where McCormick Place East is now.

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Mayor Emanuel has some words for the Friends of the Parks:

“Stop negotiating inside your board, making up differences.  Because George Lucas, right now – while the clock is ticking and the sand is running through the clock … is now in discussions with other cities on the West Coast. And you could cost Chicago a significant educational and economic opportunity.”

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He didn’t elaborate. The mayor made his comments to reporters Monday after speaking at the groundbreaking for Nobu, a hotel and restaurant in which actor Robert De Niro is a partner.