A vacant building on the Southwest Side was destroyed after a massive fire early Friday morning. The fire started just after 12:30 a.m. at a building along Frio City Road near West Malone. Crews arrived to find heavy flames shooting out of the building. The building eventually collapsed. Firefighters say the building wasn't occupied at the time and there were no injuries reported. CPS Energy crew was on scene to repair some damaged overhead electrical lines. Nobody sustained any power outages due to the fire. The cause is still under investigation.