1. Get a NOC to mortgage from SBI
2. You must REGISTER a SALE DEED from the builder into your name at the SRO where the property is located at. A sale agreement is not valid to trace the flow of ownership
3. Some kind of completion certificate from local government authorities
Usually these will be asked by bank while disbursing the home loan
A suggestion based on experience..never take loan from the bank approving the project which in this case is SBI..why?.well it pays to be double cautious while investing a truckload of borrowed money.