Compensation claims of almost £75m could be footed by the London Mayor’s Office after the Court of Appeal ruled businesses can claim for 'consequential losses' for property damaged during the 2011 riots.
The claim was lodged following the destruction of a Sony warehouse in Enfield.
About 25 youths smashed into the unit, looted it and then threw two petrol bombs causing the building to burn for almost 10 days.
Previously it was believed compensation payable by police under the Riot Act was limited to physical damage.
Last year, a high-court judge ruled that insurers, and the owners of uninsured property, were entitled to compensation from the mayor.
Appeal judges have no gone further and said the mayor is also liable for consequential losses such as rent and profit.