21c Museum Hotel Oklahoma City has officially received the prestigious Four Diamond rating from the AAA rating committee. This achievement ranks 21c Oklahoma city as a premier establishment vetted by AAA professional inspectors, the hospitality industry and over 56 million AAA and CAA members. Fewer than six percent of the nearly 28,000 properties approved by AAA are bestowed this distinction. Rankings are determined by criteria that demands the selected properties exude a refined, stylish atmosphere with upscale physical attributes; have extensive amenities available; a high degree of hospitality; and possess exemplary service and attention to detail. There are only three other hotels in Oklahoma City that share this distinction.