Keep in mind that you need to use the sale prices of the comparables AFTER adjustment for transactional issues. For example, if there are condition of sale, financing/cash equivalency, property rights or other transaction terms that require adjustments you need to account for these before performing your extraction calculation.
I will comment on your question about abstracting EI from financial statements at a later date.
Thank you for the EI comment to come.
Now I am wondering if appraisers in general are aware of the mathematical rules on significant digits (figures) as they should be.
We can break it down:
- Sales price is a fact.
- Sales concessions, etc. are facts, what to do with them is math
- Depreciation is an educated judgement call or estimate, then math
- As-is value of site improvements is estimates, with math and judgement
- EI is an estimate, maybe based on math from financial statements, but still an estimate
- Site value for each comp might look like math, but there is a whole lot of estimates and judgement calls in getting to it
- Site value per square foot is then more math, but then reconciled with experience and judgement
- And then THAT must be considered following Denis's fine examples earlier in the thread
At the end of this we have an extracted site value. How credible is that value?
Things like the cost approach using M&S or any other source might get us to within, what, 10% of the actual RCN? It's limited, severely, by the quantity and quality of data input.
So, we're already talking about reporting $110,000 or $120,000 and not $111,000 or $121,000 because it isn't reasonable to think that the RCN from any tables or software are that granular on the RCN (within 1%), unless we fed it the entire blueprint and materials list down to buckets of nails. Anyone regularly have that list on a 1004 refi assignment?
Things like terms of sale, or concessions might be a few percentage points at best.
Once you use your judgement and not pure math on any number, you've further reduced what could be argued to be a reasonable number of significant digits to report: