It happened on Grove Street in Bushwick on Friday evening.
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The boys fell approximately 30 feet to the ground.
"We just heard this loud thud. Like one like this after another," said Albert Mathew, a resident.
Residents in the building, described the mortifying sound of death.
The 13-year-old boy died at Kings County Hospital and the other, a 15-year-old boy, is in critical condition.
"We didn't hear anything except for the thud. I was talking to my roommate and out of nowhere just loud thuds. No screams, no conversations, no loud voices. Just thuds. Just the impacts," a witness said.
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Neighbors say teens who don't live there are often accessing the roof.
There is a sign posted on the front door.
Nearby residents meanwhile are not surprised.
"Kids play on the roof. That's a normal thing. It's been going on for years. I did it when I was young. I did it too. I used to jump across the gap and stuff to see if I could do it," said Steve Somerville, a resident.
There is a police investigation underway.