J.S.
I am a landlord and my current tenant has a lease-to-buy option. Basically his usual lease has a rider which states that until the lease expires he has exclusive rights to buy the property for a pre-agreed-upon price (which is stated in the rider). It also says that he'll receive a credit for $200 per month in which he pays rent to me - so if he rents for two months and then buys, he'll get $400 off the agreed-upon price. If he rents four months and then buys, he'll get $800 off the price. At the end of the lease he can walk away without buying the property, but he also forfeits the $200 per month. Other than those terms, it's pretty much just a normal sale - he'd have to secure his own loan.