The addition will include 310 hotel rooms, an event center, meeting spaces, new restaurants, a day spa and salon and a 1,500-seat concert venue. WASHINGTON - Perhaps feeling the competitive pressure coming from MGM’s National Harbor casino late this year, Maryland Live! casino at Arundel Mills is embarking on a $200 million expansion.ĭeveloper The Cordish Companies says expansion plans will include a 17-story hotel, called Live! Hotel. Business & Finance Click to expand menu.