It happened around 9:30 p.m. Friday at the Crema Restaurant on West 17th Street.
Police said a woman came up to a nanny pushing a baby boy in a stroller in Chelsea late Thursday afternoon, and tried to push a stroller away.
The last building to house the powerful Tammany Hall Democratic political machine of the 19th and early 20th centuries has been designated an official city landmark.
Two pedestrians were killed, and three others were injured, in four separate accidents this weekend in three boroughs of New York City.
Police Monday were investigating a shooting that left two men dead in Newark, N.J.