Transfer registration in records of Munici. Corp.

50year Lease Rental agreement was made with Municipal Corp. Of a large plot in 1965 of which M holds 4 small divided plots.M died,he had made will & had named his wife,N the transferee. 1) Now when we have to pay lease rental,Municipal Corp. are saying first register transferee's name in our records, which will cost around 2-3lakhs. What's the correct procedure to do so? And how much does it cost? (Specify rate per sq feet if applicable, area-jabalpur, M.P.) 2) 50year Lease Agreement ends in 2015.The whole plot was earlier single, but now it is divided into many different plots, N has four plots named after her. She wants to renew agreement only for her share of 4 small plots & not the original whole plot. Can she do so? What shall be the procedure and if possible give, estimated cost of renewal ?