The Maryland State Fire Marshal's office said the fire began in a bathroom at the facility on the morning of February 26.
Damage is estimated at $300,000 to the 66-by-30-foot wood-and-tin framed building, and $100,000 to the contents inside.
No injuries were reported.
Anyone who can help with the investigation is asked to contact the Maryland State Fire Marshal's Office at (410) 713-3780.
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