We had a unit we no longer wanted and I just signed a letter surrendering it back to the Towers. But you had to do it before the AMFs for the next year came out and if you missed that date you were held responsible for the fees for the up-coming year. We used our November week in Nov. 2015 and while we were there we signed off on the unit effective at the end of our week and commencing in January of 2016 without any problems.