I’ve just gone through the same decision as you are now. As much as I love to travel, I must stay committed to my goals in investing.
Seeing that you already have some deals under your belt you have to ask yourself if you’ve achieved what you set out to do in the first place. If you have -fantastic! If you haven’t -then maybe you should rethink what it is you really want.
Eg. Look for something different that would benefit the tennants you mentioned, and see if they would agree to a longer/new contract.
See if you can dig up any past history of the tennants and review that- you don’t want to keep any trouble makers. Why is the owner selling?
Maybe look at your options closer.