The guy had climbed a tree to reach upper reaches of the building at Beverly Boulevard and Union Avenue when he fell, according to the LAPD.
Police told us the suspect was in "critical" condition:
It happened about 2:30 a.m., police said.
He was actually in the act of tagging the building when he fell, according to cops: He was declared brain dead after he was taken to a hospital.
We reached out to the LAPD's nearby Rampart Division and to its Media Relations folks for an update but they had no new info yet.