No cause has been determined for a destructive fire that destroyed two Warrenton businesses last Thursday, Dec. 29. Warrenton Fire Chief Mike Owenby said the investigation into the cause is ongoing, but he did report that the fire is not considered suspicious. The state fire marshal’s office was at the scene Friday. The fire engulfed a building housing both Dr. James P. Brent’s general dentistry office and Relax-U, a massage business, located on Highway W just north of the North Service Road intersection. Owenby said an employee of one of the two businesses reported that something smelled hot prior to leaving at 3 p.m., but that nothing could be found. “Right now we’re having to rule it undetermined,” Owenby said. The fire was first reported around 9 p.m. by the alarm company followed by a passerby, Owenby said. The building and nearly all of its contents were unsalvageable. No one was inside the building at the time the fire was reported and there were no injuries reported. Owenby said it appears the fire originated from a room where the massage business was located and spread through the attic into the rest of the building. “An attic fire is a difficult fire to fight anyway,” he said. “You take a building that has been added onto and built for other purposes, then you have hidden spaces for the fire we couldn’t get to.” The building was first constructed for an automotive repair shop and had two separate exterior tin walls, Owenby said.Firefighters from Wright City, Marthasville, Wentzville and Hawk Point responded to the fire. Crews were on the scene until 4 a.m.