Realty Income Corporation is a real estate investment trust that invests in free-standing, single-tenant commercial properties in the United States, the United Kingdom, and six other countries in Europe. These properties are subject to NNN Leases. The company is organized in Maryland with its headquarters in San Diego, California. The company is one of a few real estate investment trusts that pays dividends monthly, rather than quarterly, and has registered a trademark for the phrase "The Monthly Dividend Company". Wikipedia