A fire that may have been started by electrical equipment scorched offices and caused extensive smoke damage in a westside warehouse Wednesday night.

According to Salt Lake Fire Battalion Chief Gordon Nicholl, the fire was reported at 8:38 p.m. at Reynolds Aluminum Building Products, 410 W. Seventh South.The owner told fire investigators he arrived at the business because he was worried about earlier problems with electrical equipment. He opened the door and found the building was filled with smoke, Nicholl said.

"He said there were some electrical problems with some equipment and had unplugged it. He was worried about it, so he came by to check it," Nicholl said.

Four engines and 25 firefighters responded to the scene and contained the fire in a bathroom and hallway area. The blaze had spread into three adjoining offices and into the attic. While firefighters battled the blaze, smoke billowed from the roof and window.

Fire investigators have not released a cause for the fire or a damage estimate. A "for sale" sign was posted in front of the building, and officials were unsure whether Reynolds was still doing business at the location.

No one was in the building at the time of the fire, Nicholl said.