The Tri-State Fire District was called at 0639 hours on May 19th for a Structure Fire. Companies arrived to 7200 Madison Avenue to find a single family structure, converted to office use, with Heavy Smoke & Fire through the roof. Fire Crews made an interior attack and conducted a primary search confirming that there was no life threat. The Fire Tactics were then moved to a defensive mode due to roof & structural collapse. No injuries reported. The fire is currently under investigation but deemed non suspicious and a $250,000 dollar loss. No more information is available at this time.