It happened around 1 p.m. in the 900 block of Lansdowne Road.
Firefighters said when they arrived there were flames shooting out of the front of a middle of row townhouse.
Deputies from the State Fire Marshal's office determined that the fire started outside of the home in a mulch bed and subsequently spread to the siding.
Investigators said the cause of the fire was discarded smoking material.
Damage was estimated at approximately $250,000.
The homeowner and neighboring residents are being assisted by The Red Cross of Delamarva.
No injuries were reported.
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