Firefighters were called to the St Aubyns Road Area, Truro on Friday after a report of a blaze at a derelict building.
Crews from Truro and Perranporth were called to the fire in an annexe area of a two storey building just before 8pm.
A total of of 16 personnel were committed, extinguishing the blaze using four sets of breathing apparatus, two jets and a hosereel.
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