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OAK PARK, ILL. — Healthcare Trust of America (HTA) has agreed to buy the Rush Medical Office Building in Oak Park for $54 million. The acquisition is part of a purchase option associated with a mortgage investment made by the REIT in December of 2009. The mortgage was secured by Rush MOB and included an option that would allow HTA the ability to buy the 135,000-square-foot property this summer. Rush University Medical Center is fully leasing the medical office building through 2019.