We have a property in kolkata which was acquired by our late grandfather before independance it has been encroached by some 2 or 3 families who claimed to be tenants and who never paid rent but they claim that rent is being deposited in municiple corporation(under what rule we dont know) .The property now belongs to us by virtue of succession and since it is very old and in delapidated condition we want to redevelope the same .The building may collapse anytime but the tenants are not vacating . Please guide how to vacate them we are ready to give a reasonable amount for vacating but they are demanding exorbitant amount and blackmailing us to stall entire redevelopment process. Can you guide us to vacate these tenants.