FIREFIGHTERS say a fire in a flat at the former Pilkington headquarters was started deliberately.
Crews were called to the address on Canal Street and firefighters wearing breathing apparatus used hose reels to tackle the flames.
The crew also carried out a search to make sure no-one was inside the flat, which had severe fire damage to half of one of its rooms.
Following an investigation Merseyside Fire and Rescue Service believes the fire, which happened just after 9pm on Thursday July 23, was started deliberately and police are now appealing for information.
Watch manager Jason Hannah said: “Smoke alarms in the property alerted neighbours to the fire who then called the fire and rescue service.
“Firefighters worked quickly to contain and extinguish the fire.
“We advise people have working smoke alarms on each level of their home.”
Firefighters from St Helens, Newton-le-Willows and Eccleston fire stations all attended the blaze, which started in a bedroom of the flat at Reflection Court.
The operation to bring the fire under control lasted around 25 minutes.
The building served as Pilkington’s headquarters until it moved to Alexandra Park in the mid-1960s.
Anyone with information about the fire should ring Merseyside Police on 101.