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Good point on likely lost their ag exemption for taxes.
Think the minumum acrage for Tennessee greenbelt ag tax exemption is 15 acres,plus a certain amount of ag income<snip>
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May not be that bad. As a VA farmer (among other things) I can tell you how it works in the counties I am familiar with. If you have an ag exemption and purchase a small adjacent lot not formerly in ag or forestal use, you can add that to your ag land right away, no proof of income or waiting period (that does vary among VA counties in the details). We bought 3 parcels, 2 of which were in land use (totaling almost 250 ac), but the 4 acre lot was not. We were able to make it part of the farm and forest (actually all forest) without a hiccup.
I also know of landowners who have fully platted and recorded subdivisions on their land to protect against future zoning changes, and they continue to get land use without problem (obviously they are still farming the land or growing trees). Now they are indeed piling up some serious roll-back tax burdens on the conversion should they start selling lots, but that is not the present tense.
So at least in VA simply doing subdivision work does not remove the ag exemption.
HTH
[new here--CPA, active investor, business owner, and former realtor, who keeps up with the market, with 2 undergrad appraisal courses]