Standard legal due diligence for an Indian property purchase involves tracing the title deed and chain of ownership back 15-30 years (a full 30-year search is recommended to catch any 'lost' relative who could later claim a share), obtaining an encumbrance certificate to confirm no outstanding mortgages or registered claims, and verifying the seller's name appears correctly in the local Mutation Register — skipping this last check is a common cause of double-selling fraud. Registration of the transaction itself (Registration Act, 1908) is mandatory for legal validity for any transaction above ₹100.