At 0401 hours CFD was alerted to a residential fire in the 300 block of Venice Drive. Upon arrival Engine 252 found heavy fire and smoke coming from the residence. Engine 252 was advised that all the occupants were out of the residence and after confirmation that everyone was out began an interior attack. Interior operations were hampered by poor structural conditions and operations were moved to exterior only. Tanker 253 and Medic 257 also responded. Units performed overhaul and cleared at 0613 hours.