CRMLS Brings the High Desert Association of REALTORS® Onboard as a New Participating Association News provided by Share this article Share this article CHINO HILLS, Calif., May 28, 2021 /PRNewswire/ -- California Regional MLS (CRMLS), the largest and most recognized multiple listing service in the United States, is proud to announce the upcoming addition of another Association of REALTORS® to its group of participating Associations. On June 1 st, 2021, the High Desert Association of REALTORS® (HDAOR) will join CRMLS as a full participant. HDAOR members will continue to use their pre-existing Rapattoni MLS system as their primary means of accessing MLS listing data. In addition, starting from June 1