The premises belonged to an NGO, founded by social entrepreneur and Magsaysay awardee Anshu Gupta, said a senior revenue official.
The fire was reported around 6.55 PM after which ten fire tenders were rushed to the spot. It took more than an hour for the firefighters to douse the flames, after which a cooling operation was launched, said a fire official.
However, the cause of the fire has not been ascertained yet, the official added.