The "465" area code that will serve the Bronx, Brooklyn, Queens, Staten Island and the Marble Hill section of New York City went into effect on Thursday.
The FDNY says a rescue drone deployed floatation devices to help two distressed swimmers off Beach 97th Street.
Fire officials said the blaze started on the building's second floor before spreading to the third floor.
Commuters can expect some service disruptions on the G train to continue into July.
Two people were treated at the scene by EMS workers, the FDNY said.
A witness at the scene said that she saw a teen boy on the ground unconscious, with a wound on his head, and the debris appeared to be a heavy piece of concrete.