A falling stock price has made Agree Realty an even more attractive passive-income investment.Agree Realty (ADC -1.44%) has become a magnificent dividend stock over the past decade. The real estate investment trust (REIT) has grown its dividend at a 5.6% compound annual rate during that period. It also switched from making quarterly dividend payments to a monthly schedule, increasing its attractiveness to those seeking a recurring income stream. Despite Agree Realty's success, shares of the REIT have slumpe ...