Even IF you are not required to disclose the LA License, it's not going to hurt you to do so. You are not purporting to be any more of an Expert on Florida Real Estate than the Buyer is; but you may be a more astute bargainer.
Before accepting this Neighbor's Offer, I think you and your Siblings would be well advised to become acquainted with the local values and the extent to which the "Restrictions" you speak of are a Detriment to some; but may actually be an Benefit to others.
I would pay a Local Realtor or an Appraiser to prepare an independent valuation BEFORE entering into negotiations with the Neighbor.
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Dale C. Hittle of GOLDEN RULE PROPERTIES in Glover, Vermont
Where We're Always Striving To Put Together "THE FAIR DEAL"