“Our signature Italian restaurant is finally back and serving up all of the coastal favorites our guests have grown to love, along with a new Sunday bottomless brunch offering,” said Anthony Cieplinski, executive chef at MGM National Harbor. Guests will be able to reacquaint themselves with Osteria Costa’s authentic Italian cuisine and explore the new menu featuring a buffet of Italian twists on classic brunch dishes. Just over the Potomac from Alexandria you'll find MGM National Harbor’s popular coastal Italian restaurant, Osteria Costa the eatery will reopen for service on Friday, May 13, along with welcoming a new bottomless brunch experience which will debut Sunday, May 15. Brunch will be available at Osteria Costa at MGM National Harbor beginning May 15.