Two young people plunged from city buildings Tuesday, leaving one dead and the other critical, cops said.

The first incident occurred around 6:40 a.m. in Kips Bay in Manhattan, when an 18-year-old woman fell or jumped from an apartment building on East 29th Street near Park Avenue, authorities said. She was pronounced dead at the scene.

Her identity is pending proper family notification, police said.

About two hours later, in The Bronx, a 22-year-old man jumped from the rooftop of a six-story apartment building at 2537 Valentine Ave., cops said.

The man, who also wasn’t identified, was taken to St. Barnabas Hospital and is in critical condition, sources said.