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...