No injury or casualty was reported in the mishap, he said.
The blaze erupted on the the first floor of Mantralaya -- the state secretariat -- around 11 pm yesterday, the official said.
Four fire engines were pressed into service which managed to douse the flames within 15 minutes, he said.
Prima facie, it appears that the fire occurred due to a short-circuit, the official said, adding that the exact cause of the blaze was yet to be ascertained.