 While large mega-cap stocks tend to get the most news coverage, smaller companies can be some of the best long-term investment opportunities. Small cap stocks tend to have higher volatility than their larger counterparts, but also can have the most compelling growth potential. With that in mind, heres why Empire State Realty Trust NYSE: ESRT, Green Dot NYSE: GDOT, and EPR Properties NYSE: EPR could be smart additions to your portfolio during Summer 2020. 