In the decision of Central Information Commission in the case titled Surender Pal Singh vs SDM (Kanjhawala), GNCTD bearing no. CIC/SA/A/2014/000462, it has been laid down that transparency of land records is the mandate as per the RTI Act and it is the duty of land authorities to provide information about land records to citizens.
The land ownership records, are available with the Sub Registrar office or Tehsildar/Block office of the tehsil/block in which the Land is located. You can file RTI to these departments.
You have to provide the Land Khasra number/Khata/Survey number and address of the land to get the required information from the Sub Registrar office or Tehsildar/Block office of the tehsil/block in which the Land is located.