Rafael Roldan previously pleaded guilty to murder and assault.
A 39-year-old firefighter, Patrick Joyce, was killed and two other firefighters were seriously injured in October 2009.
Roldan's lawyer said his client was trying to burn his landlord's clothes after being evicted from the multifamily building.
Joyce died as the result of a three-story fall after he and the other two firefighters became trapped by fire and heat and were forced to jump.
Firefighters Joseph Murray and William Kanych survived, but sustained serious injuries. Murray's required his continued hospitalization and his early retirement from the Yonkers Fire Department. Kanych's injuries required his continued hospitalization and surgery.