The incident happened just after 11 a.m. on the 3200 block of Columbia Pike, just east of the S. Glebe Road intersection.
The victim was robbed of his cash but no injuries were reported. Police tried to track the suspect but were unable to find him.
From an Arlington County Police Department crime report:
ROBBERY, 2017-01020060, 3200 block of Columbia Pike. At approximately 11:13 a.m., an officer on routine patrol was flagged down by the victim who reported they had just been robbed at gunpoint. The victim advised he was in the stairwell of a business when the unknown suspect produced a handgun and robbed him of an undisclosed amount of cash. A K9 track of the area returned negative results. The suspect is described as a Hispanic male with an average build wearing a red and black hoodies and blue jeans.