At 01:13am on Wednesday March 9^th, 2022, Wilmington Fire units were notified of a residential structure fire at 515 W. 18^th Street.  Engine 5 arrived and immediately began fire suppression efforts of a fire located on the third floor.  Engine 1 assisted with a back-up line and secured a water supply.  Squad 4 completed a search of the building with Ladder 1 and found new residents inside the structure.  Ladder 2 operated on the roof, completing vertical ventilation of the structure to aid in fire suppression efforts.  The fire extended throughout the third floor and into the roof before units could fully extinguish the structure.  No injuries were reported to civilians or firefighters and Command placed the situation under control.  The Fire Marshal’s Office is currently investigating the cause and origin of the fire.