The blaze broke out at 210 Espanong Rd. in Lake Hopatcong shortly before 10:50 a.m. on Friday, Aug. 26, according to the Sparta Township Fire Department.
The address appears on Google as the location of the American Legion U.S. veterans association.
Additional crews were called to the scene following a partial building collapse, initial reports said.
Meanwhile, Espanong Road was closed from Edison Road to Noland Point, police said.
Scroll down to view additional photos from the scene.
Click here to follow Daily Voice Ridgewood and receive free news updates.