A 16-year-old boy who had been waiting to see an administrator about a disciplinary issue jumped to his death from a private Upper East Side high school building early Thursday, cops and sources said.

The teen plunged from a fifth floor window at Regis High School, a Catholic, Jesuit school on East 84th Street near Madison Avenue around 9:30 a.m., police said.

He was found outside the building “with injuries indicative of falling from an elevated position,” and was rushed to Weill Cornell Medical Center, where he was initially listed in stable condition, authorities said.

The 16-year-old who jumped from the fifth floor of Regis High School had been waiting to see an administrator about a disciplinary issue, cops and sources said.

His condition took a rapid downturn and he was pronounce

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