Three suspects robbed a man outside a tony Central Park West building and were nabbed just two blocks away, police said.

Police were investigating reports that the trio used a weapon and it wasn’t immediately clear what the thugs took from the victim around 9:35 p.m. in front of the Ardsley.

Cops used helicopters and found three suspects two blocks away on Amsterdam Avenue and West 91st Street, police said.

Charges are pending and the suspects’ names were not immediately released.