Summary: Emergency services responded to a reported structure fire at 642 20th Street, between Ferry and Pine, in Niagara County, New York. Multiple fire units, including Engine 483, Truck One, Rescue 1, and Car 80, were dispatched. On arrival, crews found a vacant two-story brick building with heavy fire involvement on the first floor. Firefighters encountered dangerous conditions, including a large hole at the base of the stairs and high heat on the second floor. The incident required coordinated interior and exterior operations, including handline deployment, hydrant connection, and search of the basement and upper floors. The property owner was notified, and the fire was eventually brought under control with no fire found in the basement. The event involved significant risk due to structural hazards and fire conditions.