A menacing gunman who died after a Manhattan shootout with cops earlier threatened to kill a resident in an elevator before walking out of an Upper East Side building with a gun, the man told the Daily News.

Just moments before Elijah Brown, 20, was killed in a gun battle with cops, the unhinged youth pulled his weapon on an unsuspecting building tenant and threatened to kill him, the resident said.

Mohammed, a cab driver, said he was waiting for the elevator when Brown sidled up next to him, and asked if he knew him.

“I said, ‘No. You live in this building?’ He say, ‘Ya,’” Mohammed recalled.

Once they were inside the elevator, he said Brown asked him how old he was. But Mohammed said he was paying more attention to the hand behind Brown’s back. Mohammed said he thought the guy mig

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