The Ritz Club was a casino in the basement of the hotel, occupying the space which was formerly the Ritz Bar and Grill. In the original structure, this was where the Ritz ballroom was located. A May 1906 edition of Truth magazine described the basement with the Grill Room and Banqueting Hall as palatial, ivory-white in decor, with "mirrors on all the walls reflecting an endless intersection of arched ceilings". The rooms were used for dinners, balls and theatrical shows, with a stage at the south end of the Banqueting Hall. By the mid 1920s the Grill Room had been relocated into the Banqueting Hall, and furnished with circular tables with oval back wicker chairs. One 1926 brochure stated that it was the scene of "some of the finest private and public balls ever given in London".
