The fire caused an estimated $75,000 in damages, officials said.
Firefighters were called to the townhouse at 11686 Generation Ct. about 5:20 p.m.
Smoke and fire were seen in the rear of the three-story, middle-unit townhouse, fire officials said. The fire was contained to one house with no fire extension to adjoining townhouses.
No one was home when the fire broke out and there were no injuries. Two adults have been displaced, fire officials said.