Unless you feel this place is an exceptional one in your mind, and just nothing out there compares to it, then you should pass it by, and keep looking. If the owners have had it on and off the market several times, then they are definitely intent on selling it. If they decide to lower their price to finally get it sold, guess what? You will be possibly having to let a lot of prospective buyers in to view the home. And usually most leases state that you as the tenant must allow that to happen, if you are given a 24-48 hour notice, and showings are during normal working hours of 9-5. If you are uncomfortable with those intrusions, I would suggest you find another place to rent.