The long legal battle that led up to the casino's groundbreaking is starting up again.
Baltimore-based Cordish Companies announced it is suing the Maryland Jockey Club and its owners, Magna Entertainment and Penn National Gaming. Cordish claims the defendants conspired to defame them, and is seeking $600 million.
The Jockey Club led opposition to the casino, as it sought to build a similar venue at the Laurel Park race track.
Anne Arundel County voters approved the Arundel Mills location in a referendum last November.
The Jockey Club called the suit's claims baseless. Penn National Gaming owns casinos in Perrysville, Md., and Charlestown, W. Va., the two closest casinos closest to the Arundel Mills venue.