The cause of an early-morning fire that heavily damaged a Harvest Commons Condominium unit early Thursday is still under investigation, Fire Marshal Ed Zygmant said later in the day.
"At this time, it doesn't appears to be suspicious," he added.
Zygmant didn't have a dollar amount of damage to unit 506, but said the damage was substantial. "There was some structural damage and it will take a while to repair," he said. "Some of the floor joints were completely burned through."
No one was injured, according to the fire report.
The fire was reported just before 4 a.m. Thursday, and heavy smoke was coming from the building when firefighters arrived on the scene.
After determining the origins of the blaze, firefighters entered the basement to battle the fire, but were ordered to leave when flames burned through the unit's first floor and caused a partial collapse.
Fire crews continued to attack the fire from the area where flames burned through the floor, and eventually brought it under control. An adjoining unit suffered light smoke damage.
"They guys did an outstanding job," Zygmant told the Westport News. "They held the fire where they found it."
Fairfield firefighters assisted Westport fire crews at the fire scene, and an engine company from Norwalk relocated to Westport fire headquarters to provide backup coverage for the town.
The American Red Cross assisted the condo residents, who were forced from their home because of damage from the fire.
Fire crews remained on the scene several hours after the blaze.
About 9 a.m. a contractor arrived to assess the damage. He said he was called in by the condominium association.
Workers from Maguire Associates, a fire restoration company, also arrived about the same time.