Purchasing a property is one of the biggest financial decisions most people will ever make, and it comes with a long list of documents that require careful scrutiny. Missing a key detail or signing without fully understanding the paperwork could lead to delayed possession, financial losses or even legal disputes later.Among the many documents involved in a property transaction, four stand out as particularly important: the Occupancy Certificate (OC), Completion Certificate (CC), RERA registration, and the sale deed.