You should be aware that some owners offer rent to own as a business model. Rent to own security deposits tend to be higher than a typical security deposit. Only about 1/3 of the renters that opt for this "scheme" go through with the purchase. This means that in many cases depending on how you structure the deal, you might lose your higher than normal security deposit. The landlord will also say that your rent is higher than market rates and a portion is going toward your down payment. If not properly structured you could lose that as well. The upshot is to be careful with this idea and be sure that the purchase is what you want.
If you'd like more information, feel free to email me.