The renewal of the trademark and ownership transfer are two different processes. In the renewal process, you are not submitting the details about the trademark owner, so you'll have to do it separately. However, you can ask your legal representative to do both processes at once.
The fees for these services are separate as well. You have to pay for renewal and also for preparing corresponding documents regarding ownership transfer. However, it can certainly be advantageous to do these two legal acts simultaneously and start the new period of trademark validity with a new owner.