Valley Regional Fire Authority investigators have determined that the Heritage Building fire on Tuesday originated in the laundry room on the second floor.
The VRFA investigation team is collaborating with the insurance companies to complete an appliance analysis. The cause and determination will be released upon completion of the full-scene examination, the VRFA said.
The fire damaged the 96-year-old building, destroying the second floor of the 21,000-square-foot structure. The building housed 35 residential units and 12 businesses.
There were no reported injuries to firefighters. Several individuals were evaluated for smoke inhalation, but no one required transportation to a hospital, the VRFA said.
A total of 33 fire apparatus and 82 fire personnel responded.