Officers responded to the station for a report of two subjects fighting in the plaza area. Once officers arrived, they determined that it was actually a strong arm robbery. The victim reported that he was at the station to buy drugs and was counting his cash in the plaza area when an unknown suspect approached and tried to take his cash. The suspect reportedly punched the victim in the face multiple times when the victim struggled to maintain his cash. The victim was able to retain his cash and the suspect fled on foot northbound on 16th St. towards South Van Ness. The victim sustained bruising and bleeding on his face and was transported to SF General Hospital for his injuries. Officers searched the area for the suspect with negative results. SFPD was also advised of the suspect description. (Suspect description: Black male, 20-25 years old, stocky or chubby build, wearing a green polo shift.) The investigating officer will be requesting station video.