An investigation has been launched after a 'suspicious' fire started in an disused office building in Preston, say fire services.
Crews from Preston were called by police to the Old Docks House on Watery Lane at just after 4am this morning.
Firefighters discovered a flood in the basement and a small fire in the Grade II listed building.
A spokesman for the fire service said: "We were called to the Old Docks House early this morning by the police. Crews found a flood in the basement and a small fire in an office.
"Four firefighters equipped with breathing apparatus extinguished the fire using hose-reels and ventilation fans.
"The fire is believed to be suspicious."
Nobody was injured during the incident and an investigation into the cause of the fire has been launched.
Old Docks House is currently listed for sale for £800,000.