Woman, 70, in deadly Upper E. Side plunge

A 70-YEAR-OLD woman plunged to her death from the 15th floor of a luxury Upper East Side apartment building Sunday morning, officials said.

First responders rushed to 10 Gracie Square at East End Ave. and 83rd St. at 10:35 a.m., authorities said.

Police believe the woman leaped from the top floor and landed on an eighth-floor balcony, cops said. Her legs struck the balcony’s railing, severing one of her feet at the ankle.

Paramedics arrived at the scene, but she could not be saved.

Cops have not yet released the woman’s name.

The building where the woman died was once home to heiress Gloria Vanderbilt, who lived in the penthouse.

Vanderbilt’s son, Carter Vanderbilt Cooper — the brother of CNN anchor Anderson Cooper — jumped to his death from the unit’s terrace in 1988.

Carter, the oldest child of Gloria and author Wyatt Cooper, was a Princeton University graduate and working at American Heritage as a book editor before his death.

He had been seeing a therapist for depression a month before throwing himself off the balcony of the penthouse, in front of his mother.

On March 2, financial guru Charles Murphy, 56, a hedge fund executive nearly ruined by the Bernard Madoff scandal, jumped to his death from a 24thstory window at the ritzy Sofitel New York Hotel on W. 44th St.

Police sources said Murphy was taking antidepressants before his leap. He had recently signed off on paperwork naming his wife the co-owner of their E. 67th St. home.