BOSTON — An agreement calling for the state to receive 21.5 percent of gambling revenue from a tribal casino, though less than its share of any future commercial casino revenue, would nonetheless be among the most lucrative deals negotiated by any state with a Native American tribe, Gov. Deval Patrick said Thursday.

The 53-page document, which spells out conditions for the tribe and the state as the Mashpee Wampanoag tribe pursues a resort casino in Taunton, was signed by Patrick and tribal leaders on Thursday and was filed with the Legislature. Lawmakers have until July 31 to approve the casino compact if the tribe is to retain exclusive rights to develop a casino in southeastern Massachusetts.

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