Berkshire Hathaway's billionaire chairman and chief executive officer, Warren Buffett, is known for many of his quotes filled with wisdom. Real estate investment trusts (REITs), for example, are legally obligated to pay out a significant portion of earnings in the form of dividends. In addition to 99% of the company's leases being linked to either inflation or fixed increases, Medical Properties Trust's rent revenue and AFFO per share can rise with each passing year.