Aside from the possible ability to sell the house and cancel the lease, there are other clauses that should be especially important to you. Most of them deal with maintaining the condition of the unit.
First and foremost, you should not allow any pets. It sounds heartless and may cost you some tenant prospects. On the other hand, even a small dog or cat can cause thousands of dollars of damage due to clawing walls, floors, and wood trim. Pet hair in the HVAC system can result in breakdowns. Urine odors will discourage buyers, but urine itself can damage carpet, padding, sub-flooring, baseboards, and drywall. The territorial markings of a male cat will never come out of the surfaces marked. Even mice and hamsters can escape to spaces between walls and floors, where they can breed or die and cause horrific odors. They can also easily destroy electrical and phone wiring. A small, leaking aquarium can destroy your flooring. A cat litter box can cause unpleasant smells when you are trying to show the house. Even outdoor pets can damage the landscaping, and will almost certainly be brought into the house during very bad weather.
In the same vein, do not allow smoking in the house. Ask that all cigarette debris be placed in containers, rather than thrown on the ground at the back door, for example.
Next, you should have a clause requiring a certain level of cleanliness. Many of my college students complain that their leases require the premises be kept clean, dishes washed at least daily, and garbage taken out every other day. They must have a clear path of travel into each of the rooms and to the exits. My students say, in essence, that they should be allowed to live in squalor if they choose. When I point out that the issue is one of vermin, disease, and safety, they understand and concede that the clauses are reasonable. You should remember that you will be showing this house to prospective purchasers. You do not want it to look like a pigsty.
You should reserve to yourself responsibility for pest control and lawn care. That way, you make sure it is done properly each time. It also gives you a reason to regularly visit the house and check that all is well.
Make the tenant responsible for notifying you immediately regarding any problems and the need for any repairs. In addition, inspect the property once a month. My oldest stepdaughter once suffered thousands of dollars of damage in a rental house because an antique claw-foot bathtub leaked. Rather than report the problem, the tenants decided it was minor and decided not to tell my stepdaughter because they did not want to bother her. The tenants dealt with the problem by covering up the ugly place on the floor with a very large bathmat. When they moved out, my stepdaughter discovered the floor was rotted nearly through and the tub in danger of falling to the first story of the house.