I think the general concensus. Is to shape your "market based adjustments" to make the value fall within the adjusted range. Not so different than tweaking "market based adjustments to be below guidelines or line item adjustments. More form filling mentality than sound appraisal practice. Imho
That does describe backing into value via form filling .
The proper way to find out the value of the subject...find your best comps and do your adjustments. If your subject adjusted value is outside the range then you try to find a sale that brackets the adjusted subject value to prove that buyers will pay more for certain features, or if subject value is below the comps, then you try to find a lower price competitive sale to bracket the lower value, to prove that buyers are penalizing certain flaws or lack of amenities by paying less.
That is the purpose of bracketing, to confirm in the market what buyers are paying/are not paying for. The purpose of backeting is not to make it look good for the underwriter (though that is a side benefit )
Where do you search for a comp to bracket a feature or price with ? It should be in a similar /equivalent area and location and be as competitive to the subject as possible. Brining in a comp from a far superior area, for example, is almost meaningless because by the time you get through adjusting for location, the value is skewed, plus, it is not the same buyer profile because the area is too superior.
Going back in time in subject area is an excellent way to find a comp to bracket a subject value or feature, because though you may have a time adjustment, you have same location influence.
If you find a sale similar location to subject with a larger lot that sold for more than the comps, then you can use that to bracket the sales and prove that the market is paying more for a similar home on a larger lot.
What to do if you can't find a competing sale that bracekts the subject adjusted value? At that point you have to ask if your adjusted value is supportable or not. Maybe buyers aren't paying for an extra large lot in subject area/home type.
A way to check this is to calll area Realtors, and also to research expired and cancelled listings. The things buyers DON'T do is a source of information as well as what they do. For example, your subject may be on a large lot and you adjusted the smaller lots of the comps up, resulting in the adjusted value range for subject being higher than the comps.. You can't find a sale of similar home with a large lot. Researching expired and cancelled listings, you find homes with large lots in subdivision that had high asking prices, that were taken off the market after a year or more on MLS.
You call a realtor and they verify that buyers refused to pay more for the large lots, and the sellers wouldn't come down in price, so they took the homes off the market.
Thus, the market is telling you, that in that subdivision, for that type home, typically motivated buyers are not paying more for larger than average lots. Therefore, even though your subject has a larger lot, it gets no adjustment, and now that you remove the lot adjustment, the OMV is within the range of your comps.