1) dakhil kahriiz means mutation of land
2) it appears mutation of land has been done in favour of builder
3) section 143 of the U.P.Zamindari abolition ad Land Reforms Act, which authorises the Assistant Collector/SDM of the area to change the nature of a land from agricultural to residential.
4) on request of party a survey of the land is conducted by the Lekhpal , and then he sends his report to the SDM concerned , with the endorsements of Tehsildar. If the SDM is satisfied from the report, he, in turns, passes a declaration under Section 143 , converting the land use.
5)if land is already NA then no further conversuion would be required mutation should suffice