Latest Answer: Documents required for buying ready-to-move-in properties - you should check the original sale deed and entire chain of documents right from the Mother Deed and Possession Letter up to the current sellers sale deed. You should also check society membership and whether property tax and all utility & maintenance bills are paid up to date.
For under-construction property - In case of under-construction property, you must check whether the builder has received all approvals. You should carefully study all terms and conditions of Allotment Letter and Builder - Buyer Agreement.