EVERETT — Casino mogul Steve Wynn has secured a 14-month lease on a 37-acre piece of land on the Mystic River and plans to submit an application to the state gambling commission to build a $1 billion casino there, Mayor Carlo DeMaria Jr. of Everett said this week.

“We believe Wynn will put in an application,” DeMaria told about 300 residents who gathered Tuesday night for a community meeting to discuss the proposal. “What we do now is negotiate a host agreement” outlining community benefits.