1) you have to state detailed facts of your case .
2) the clauses made in the lease deed have to be gone into .
3) if there is provision in lease deed that after period of say 5 years lessee would have right to purchase the said property on payment of consideration then you can enforce the said contract .
4) if lessor agrees to acceptance of payment by installments lessee can make payment in installments
5) ) once property is sold lessee/purchaser gets title deed to the property .
6) lease cum sale deed is generally executed by housing Boards for sale of flats to various income groups