The CRB designation represents the highest level of achievement in brokerage management. The Real Estate Business Institute (REBI) is the largest affiliate of the National Association of REALTORS® with more than 49,000 members worldwide. Since 1968, the Certified Real Estate Brokerage Manager (CRB) designation has been our flagship credential and one of the oldest and most prestigious designations in the REALTOR® family. A broker's license is not required to earn the designation.