The incident happened just before 4 p.m. October 10 in a building on West 147th Street.
The suspect targeted a 19-year-old woman as she stepped off her elevator.
She handed over her valuables and was not hurt.
The suspect fled with the victim's property.
Anyone with information in regards to this incident is asked to call the NYPD's Crime Stoppers Hotline at 800-577-TIPS.