Of all the real estate investment trust (REIT) subsectors, self-storage is one of the most difficult to classify. According to the National Association of Real Estate Investment Trusts (Nareit), "Self-storage REITs own and manage storage facilities and collect rent from customers. Self-storage REITs rent space to both individuals and businesses." Self-storage REITs often get classified as specialized REITs, but the specialized category also includes REITs that own timber, farmland, data centers