Las Vegas casino developer Steve Wynn said Thursday that he plans to build a gleaming, $1 billion hotel tower on an old factory site on the Mystic River in Everett as part of his plans for a casino on the property.

“It’s going to be the fanciest hotel in the Boston area,” Wynn said during a phone interview from his home in Sun Valley, Idaho. “It will have superior rooms, first-class services, shows. It will have short hallways and fast elevators . . . It’s going to be a big attraction.”