I think it depends on the type of lease you have. If it is a type of lease-to-buy, where at the end of the lease you have the option of purchasing the vehicle, turning it in and leasing/buying another with no penalties, or selling it, then you shouldn't have a problem trading it in to any dealer. They will just purchase the car from the finance company, and add take the amount they had to pay over the amount they would give you for the auto and roll it into your next purchase.