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SAN DIEGO  – An investigation was underway Monday into an overnight fire that caused about $450,000 in damage to a commercial office building in Mission Valley.

The accidental blaze broke out shortly before 10 p.m. Sunday at Viator Massage Care, one of several businesses in the two-story Camino del Rio Plaza building at 2423 Camino del Rio South, according to the San Diego Fire-Rescue Department. Crews had the fire knocked down by 11 p.m.

The fire caused extensive damage, but no one was injured. A fire dispatcher said it caused roughly $250,000 in damage to the building and another $200,000 in damage to its contents.