The incident happened around 1 a.m. Friday at Knickerbocker Grill on University Place Greenwich Village.
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Authorities say the suspect entered the restaurant through a side door and headed to the basement, where he came across a 62-year-old man.
Investigators say the suspect then simulated a gun and bound the man's feet and wrists with tape.
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He then grabbed $8,000 and fled on foot.
The suspect is described as a Hispanic male, last seen wearing a black jacket, gray hooded sweatshirt, black pants, gray sneakers and a black backpack.
Anyone with information in regard to this incident is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).
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