The fire at the 200-year-old Royal Albion hotel in Brighton in July was likely started by a discarded cigarette, fire services have revealed.
East Sussex Fire and Rescue Service said the cause of the fire on 15 July, which lasted for more than 36 hours, had been “accidental”.
“A fire investigation has concluded that it was likely started by a discarded cigarette which had not been completely put out,” a spokesperson said.
Businesses have been advised to "ensure they have up to date fire assessments" following the findings.
No one was injured in the fire at the Grade II-listed hotel, but the extent of the structural damage meant that Brighton and Hove City Council was advised to demolish parts of the building.
The seafront property is located opposite Brighton Palace Pier and is run by Britannia Hotels.
In August, it was agreed that Britannia Hotels would be charged for “all costs incurred” during demolition and safety work at the hotel, which amounted to at least £500,000.
The Royal Albion hotel was built in 1826 on the site of the house of Dr Richard Russell, the promoter of sea-bathing who helped build Brighton's popularity as a holiday resort.