Police say the shooting happened inside of 35 Victory Boulevard, St. George around 5:45 p.m.
They say the victim was shot in the head while inside the location.
ALSO READ | College basketball star killed in NYC mass shooting
He was taken to Richmond University Medical Center in critical condition.
Police are looking for three male suspects: two wearing all black and one wearing all grey.
It's unknown what, if anything, led to the shooting.
No arrests have been made so far. The investigation is ongoing.
* More Staten Island news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube