Lease surrender

Hello,

Dear experts, I would like to know,

- what would be the charges/stamp duty on surrender of perpetual lease of a shop in Uttar Pradesh i.e. surrendering it to the sons of original lessor. 

- When one gives a contructed shop on perpetual lease (and reserving an annual rent), can the owner/lessor later sell the ownership rights to a third party?

- After acquaring the ownership rights, can the new owner get the proeprty vactated under the new rent act of U.P.?

Thanks and regards