This technical note provides a thorough overview of real-estate investment trusts (REITs). Created to promote and facilitate widespread public ownership of commercial real estate, REITs are companies that own real-estate properties or mortgages and that operate within certain guidelines, allowing them to qualify for REIT status. Focusing primarily on equity REITs, the note covers a broad range of issues, including valuation and its many drivers, and also examines the advantages of REIT ownership versus property ownership. The note concludes with a discussion of the future of REITs.