Rishabh lives in Vijay Nagar, a residential colony near Delhi University (DU). Being close to DU this area is a hub for students who come from outside Delhi to study here as they find good accommodation with Tiffin service readily available. Rishabh has a vacant residential building there. He found it to be an attractive economic idea to start a Paying Guest House. He knows that he has a good market because of the location of his building. State the other requirement he has to ensure before opting for this opportunity.