The following list of documents required for buying a flat.
1. Sale deed (Present Title deed) in name of present seller.
2. Encumbrance Certificate from date of purchase till date
3. Latest tax receipt and electricity bill & receipt for the said flat
4. NOC from the society for sale of the flat and Share certificates issued by the society if any.
5. Mother Deed’ or parent document
6. Agreement of sale & construction executed by developer in favour of seller(Ask to produce original agreement with builder)
7. Khata certificate & extract from BBMP
8. Sanctioned building plan
9. Possession/occupancy certificate from builder
10. Joint development agreement, GPA, & Sharing/supplementary Agreement, between land owner and builder
11. Power of attorney/s if any
What you mean by index of land mean by you?