(Portland, OR) -- Details of a merger between Oregon Health and Science University and Legacy Health have been finalized. If approved by state regulators, the new public system would operate 12 hospitals and more than 100 locations with around 30,000 employees. Once the transaction closes, OHSU will pay an independent Legacy community foundation an amount equal to Legacy Health's net assets for grants to support health care and health equity. The Oregon Nurses Association calls the billion dollar acquisition the largest health care merger in state history and says union officials are watching to make sure it fulfills promises of improved patient care.