A teen girl was found dead in The Bronx this morning under mysterious circumstances, authorities said.

Destiny Sanchez, 15, was found laying in the lobby of a building on Barretto Street near Spofford Avenue around 8:05 a.m., police said.

Her cause of death was not immediately clear and is pending an autopsy by the city’s medical examiner, cops said.

Sanchez did not live in the building but was believed to be visiting relatives, police sources said.