The stepdaughter of famed sculptor John Chamberlain jumped to her death from her family’s 16th-floor balcony on the Upper East Side on Monday morning.
Phoebe Fairweather, 23, sat with her legs dangling from the ledge at 800 Fifth Ave. before jumping around 10:20 a.m. as cops tried to persuade her to come back inside, law enforcement sources said.
“For a while, the woman was sitting on there and it was obvious that she was talking to someone inside the residence,” said witness Anthony Woodcock, 44, who was walking by.
“As soon as she turned back was when she jumped.”
Fairweather landed in the luxury building’s garden and was rushed to New York-Presbyterian Hospital, where she later died.
FedEx worker Gail Garcia, 48, said she tried to shout to Fairweather before she took the fatal plunge.
“I know the 16th floor is very high, but I felt like God could just transport that message to her, because there’s nothing that hard in this world that we should get to this point,” she said.
A small crowd gathered in front of the high-rise and was shocked to see the young woman sitting on the ledge.
“It wasn’t until [Garcia] actually looked up that everybody looked up and it was like, ‘Oh s–t! There’s a lady on the ledge!’” Woodcock said.
The woman’s sister, Alexandra, lives in the building — which is owned by Eliot Spitzer’s family — but Fairweather moved out a few months ago, according to doorman Gabriel Santos.
She attended Barnard College before dropping out to pursue art, and described herself as an artist with a focus on “small-scale soulful pieces” in a biography page on her website.
Chamberlain, whose crushed-car sculptures have appeared in museums like the Guggenheim and Dia: Beacon, died in 2011.
Family members told police that Fairweather has a history of mental instability, according to law enforcement sources.
She’d recently complained about the FBI watching her and that someone put a device in her chest, relatives and friends told police, the source said.
In early June, she disappeared for a day from the family’s Shelter Island home — and was later found near her sister’s New York apartment.
Additional reporting by Danika Fears