A “quintessential” city photographer left a suicide note before leaping to his death from his luxury apartment building in Tribeca on Friday, police sources said on Sunday.

“How do you enjoy life?” the note read, according to sources.

Police and friends identified the man as 64-year-old Robert Herman, a street photographer respected among his peers for his work capturing everyday New Yorkers.

Herman had published two books of his photography — “The New Yorkers” in 2013 and “The Phone Book” in 2015.

“He was a very well-known fella, a very good photographer,” said former Post photographer Lawrence Schwartzwald.

“Quintessential New York work. It’s such a shame.”

Herman moved to the city in 1976 to study filmmaking before falling in love with photography, according to a 2013 profile of him in The New York Times.

An Amazon description for “The Phone Book” — a collection of photos Herman took with his iPhone — calls him an “award-winning international photographer.”

With the book, the blurb adds, Herman “elevates the practice of street photography” and “captures the world in brilliant spontaneity.”

A worker at Terry’s deli, which is across the street from Herman’s apartment and where he would often shop, called the photographer as “a very quiet guy.”

“Very polite but not outgoing,” the employee said. “I just can’t imagine. Why would he do that?”

Herman died at around 11 p.m. on Friday when he apparently jumped from his 16th floor apartment at the Tribeca Park building on Chambers Street near North End Avenue, according to police.

He landed in the courtyard of the high-end building, where he was pronounced dead by EMS, cops said.