OAR History Oakland Association of REALTORS ( OAR ) was established in 1903 as the Oakland Real Estate Board ( OREB ), in support of local realtors. The OREB formation predates both the California ( CAR ) and National ( NAR ) Association of REALTORS Incorporated in 1904, the original purpose of the OREB was to coordinate guidelines for transactions between buyers and sellers, and to provide a foundation to promote ethical business practices. In addition, the OREB served as a forum for information exchange between and among selling agents, listing agents, brokers, and other trade associations As the OREB matured, it began developing strategies to lobby for legislation to strengthen its organization, and to protect individual property rights.