1) you should contain a local lawyer ask him to carry out 30 years title search before purchase of property.

2) if property has OC issued that would imply house has been completed as per sanctioned plans

3)you can buy property ifd title is clear and marketable

4) apply for bank loan for purchase . let bank do due diligence

5) if at all you buy property sale deed must contain an indemnity clause wherein seller indemnifies you against any claims if any made in respect of the property

6) also file RTI with BDA as to whether property is proposed to be acquired by BDA

1. What you have mentioned to be written in Kannada language is not let known here so no opinion can be rendered on that aspect.

2. A Khatha certification alone cannot be sufficient to prove the title or all other permissions from the concerned authorities including conversion etc, you may obtain all other details including permission for DC conversion etc.

3. Demolition cannot take place but they may levy penalty to regularise in case of any irregularity fund at a later stage.

4. Most important is that you obtain a proper legal opinion from a well experienced lawyer by producing all the relevant documents in your possession in this regard. He will guide you about further necessary documents to be obtained or any other steps suggested to tackle any minor or major issues.