Four fire engines have been sent to a fire at the old planning offices at South Hill.
A total of 18 firefighters are on the scene in St Helier this afternoon (3 January).
An Incident Command Vehicle and Fire Duty Manager have also been dispatched.
The fire is said to be on the first floor of the former offices.
Footage posted online shows smoke coming from the building.
People are being asked to avoid South Hill, as the road is closed at both ends.
'Momentous' week in Jersey's States
Dignity in Dying campaigners from Jersey and the UK are demonstrating outside the States building, and watching proceedings in person, as the Assembly takes an historic vote on assisted dying.
Plans to charge wealthiest patients for medical travel
Travel from Jersey to the UK for medical treatment could become means-tested.
Railway Walk reopens 'several weeks' ahead of schedule
The Railway Walk path has already reopened after a landslide, despite the government predicting it would be closed for 'several weeks'.
New bar opening at former Rojo and X site to evolve Jersey's nightlife
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Former Chief Minister seeks re-election
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Château Vermont to become home to new music campus
Jersey's School of Popular Music is packing up and relocating to Château Vermont this summer, in what will be a 'dream move'.
St Saviour break and entry suspect pictured posing on motorbike
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'Overstretched' neurology department following under-experienced managers
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