A surveillance image shows the man police say confronted the women in the stairways and elevators of apartment buildings.
In each incident, he allegedly threatened his victim with a box cutter before robbing her.
The incidents happened in the Concourse, Mount Eden and Kingsbridge Heights neighborhoods.
The suspect is described as a Hispanic male, approximately 25 to 30 years old, standing 5-foot-6 to 5-foot-10, with a slender build, light skin complexion, bald head and light blue or green eyes.
The suspect also has a tattoo on his right forearm.
Anyone with information in regards is asked to call Crime Stoppers at 1-800-577-TIPS.
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