Log into PlanetRealtor.com - do a search for "Lease Option Addendum" - the first result is an addendum approved by the Sarasota Association of Realtors.
However, I strongly advise you to use the FAR Comprehensive addendum regarding lease option and then have an attorney write it for you. This will protect the buyer, seller and YOU!
NO LEGAL ADVISE!!!
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Ignorance is Bliss...Stop being Blissful.