Firefighters arrived on Remer Court in Tallahassee around 1:30 Monday afternoon.
Investigators haven't determined the cause of the fire yet, but have not ruled out the possibility it started as a result of a weed eater being stored next to a gas water heater.
That unit was completely destroyed, but everyone home at the time was able to evacuate safely. Damage was estimated at $200,000.
There was only minor water damage to the other unit.
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