(St. George, UT)  –  Investigators are trying to determine what caused a more than 70-year-old building in Saint George to burn to the ground.  Fire crews found flames shooting from the Wilkinson’s House of Lighting building late Wednesday night.  A nearby home that’s vacant was also damaged in the fire.  Investigators have not said what they believe started the blaze, but Saint George News reports witnesses saw a nearby transformer blow just minutes before.  No one was injured. Â