The REIT is still a reliable long-term investment.Realty Income (O -0.77%), one of the world's largest real estate investment trusts (REITs), is often considered a dependable dividend stock for conservative investors. But over the past three years, its stock declined about 23% as interest rates rose. Even with reinvested dividends, it delivered a dismal negative total return of 10%.Realty Income lost its luster for a few simple reasons. Rising rates made it more expensive to purchase new properties, and the ...