Can residential building use for commercial work like factory

I have a property in city of jaipur. Our whole building in divided in sub building . Someone in our building is using his building for commerical work. He had setup workshops like factory in the building and also renting the property for the same purposes for past many years while other people are still living in the building. He is living somewhere else and using this residential building for commerical work. As per I know he do not have any permission from any department. Is it legal if not then please Tell me a way to solve this matter. My state is Rajasthan.