An autopsy completed by the Alameda County Coroner's Office cannot determine the exact time or cause of death, police said.
The coroner determined the woman had shoulder-length dark hair, was 5 feet 6 inches tall and weighed about 130 pounds, police said. She was found wearing an Old Navy shirt and pajama bottoms.
A forensic anthropologist has determined the age range of the woman to be between her mid-20s and 40 years of age, according to reports. Her ethnicity is believed to be either Asian or Hispanic, although it is also possible that she is Caucasian with Asian traits or Native American.
The deceased was found wearing blue fingernail polish, red toenail polish, and she had three ear piercings in each ear. She has no tattoos or distinctive markings.
Anyone recognizing the woman is asked to call the Pleasanton Police Department at 931-5100.