During a press conference, San Francisco General Hospital spokesperson Rachael Kagan said a hospital staff member found the body in a stairway inside a power plant building near the hospital at 1 p.m.
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Officials are working to figure out how she gained access to the inside of the building.
The case is being investigated right now by the Department of Public Health, San Francisco Sheriff, San Francisco Police Department and San Francisco Fire Department.
Officials are working on identifying the body and to determine how she died.
RELATED: Elderly woman with dementia found dead on SFGH property
This is not the first time a body has been found at a stairway on SF General Hospital property. In 2013, Lynne Spalding was found at a stairway 17 days after missing from her room.
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Officials were not acting on a missing person report when the woman's body was found. They do not yet know if she was a missing person or a patient at the hospital.
No further details are available at this time.