If you are the renter, and you are in contract to make a future purchase, what happens if you discover that there is a non-stop barking dog next door....and everything breaks in the house? You won't want to move forward with the purchase.
If you are the seller, and you are in contract to sell it to a renter, what happens if the market goes up and the sale price you agreed to is now below the market? You won't want to move forward with the purchase.
Best advice: Have a rental contract with a "First Right of Refusal" for the tenant to have the opportunity to purchase at the end of the lease. Keep the situation simple..... and your options open.
Hope this helps,
Ali, Community Manager