Elias Michael, 47, was found at about 9:45 p.m. Sunday by officers responding to a report of a dead body at 2030 Vallejo St.
The medical examiner's office has deemed the death suspicious, and San Francisco homicide detectives have taken over the case, police said.
Police spokesman Officer Albie Esparza said this morning that a person had been detained for questioning in the case but declined to release more information.
Michael worked as a dermatologist and lived with an elderly female family member, according to Elaine Chan, a receptionist at his apartment building.
Dr. Elias Michael is listed as a dermatologist on the website for Union Street Dermatology, located nearby in San Francisco's Cow Hollow neighborhood at 1610 Union St.
Employees were not immediately available for comment at the business, which is closed on Mondays.