A campaign will begin from Wednesday to demolish the farm houses illegally built in the Aravalli region, a forest official said. The National Green Tribunal (NGT) had issued an order to demolish all the illegally built farm houses on forest land in the Aravalli hill region. As per the order, the forest department had conducted the survey. About hundreds of farmhouses have been constructed on the Aravalli hills while cases related to few farm house owners are still pending in court. A large number of illegal farm houses have been set up by the people in the Raisina Aravalli hill area near Sohna. These farm houses were built without any government permission. The farm houses were developed and sold by a private builder before 1990 under the Raisina zone of the Aravalli hills. Some registries belonged to pre-1992. Some of the farm houses have been sold multiple times to different people. (IANS)