Real Estate Institute of SA – The Real Estate Institute of South Australia (REISA) is the peak professional body representing more than 2,000 real estate professionals in South Australia. Since its foundation in 1919, the REISA has been the authority in the property industry, providing valued services to members and providing them with a united voice. The REISA provides members with a range of efficient, cost-effective services and to advance the standing, professionalism and financial viability of those within the industry.