Medical Properties Trust's unhealthy portfolio has cast a shadow on its healthier properties. Medical Properties Trust (MPW 5.16%) is one of the world's largest hospital owners. The real estate investment trust (REIT) owns 436 facilities in nine countries and has leased or mortgaged its properties to 53 hospital operating companies. While the healthcare REIT has a fairly well-diversified portfolio, it has become a tale of two portfolios. It's the best of times for its international portfolio and those in th ...