Mike, good question. When's the last time you adjusted Fee Simple versus Leasehold on a URAR going to Fannie or VA? Remember it is just a form.
If you can quantify the each componet to site value, and adjust for it accordingly, you are doing better than most, and must have the data to prove it, which, when it's all said and done, you may have to do, in a court of law or before a state commission.
Take a $100,000 site value of a lake point home vs a $50,000 shallow water lake lot. I adjust $50,000 for site. I'm not good enough to quantify lake frontage/ location on the point, deepwater vs shallow, or the better view etc. I just lump it into site, and adjust it, and discuss the rest. In other words comparing Point Lots vs Shallow Water lots, and adjusting for one thing, that is site value of a Point Lot vs a shallow water lot.
To me I feel I can defend my appraisal on solid land value adjustments as opposed to, all the other things which make up site value, which are very difficult to quantify, to me, at least, in most cases.
To do otherwise, you open up a huge can of worms, or a pandoras box, the conclusion of which you have to say, because that is my opinion based on just that, your opinion. In most cases you won't have the proof of site size, location, topo, water availability, sewer availablilty, view, road frontage, etc, because of the many factors, the data becomes convoluted/diluted or undeterminable. This is something you grasp early on, by doing non residential work.
If it's something simple, like corner lot vs non corner lot, go ahead and make location adjustments. It's the same end result as a site adjustment anyway.