 Expansion continued in the 1950s, when prominent hotel architect Morris Lapidus was hired to design new modern style guest wings.At the Concord Lapidus worked with architect-interior designer Theordor Muller on interiors for lobbies, dining spaces and night clubs.A rotunda and promenade, as well as the huge Cordillion Room, Night Owl Lounge and the even bigger Imperial Room night club were added.