The unit of comparison that matters most in my area is number of bedrooms. Tenants need X number of BR, the properties are advertised by #BR, the rental varies by BR count. And, in a different segment, the investors who rent to students literally rent by bedroom.
So if the reports were on fannie forms, they would show the units of comparison. The appraiser should comment on which ones matter and how they contributed to the appraiser's opinion of value. Here, if they are adjusting for FP (that so bugs me) in rambling old houses converted to apts then they are just going through the motions of form filling. Here, when I see that, I think no tenant rents by # of fireplaces. Did the appraiser even consider whether they are functional--after all, most serve as a knickknack shelf--and if you used them you'd burn the whole place down. So, are the fireplaces even fireplaces? (If they are, it is another question whether they are permitted to use them, or care to do so.)
FP from The List: It is a tell, here, that not too many brain cells were sacrificed to the appraisal gods.
This should be the topic of discussion in their reconciliation of SCA. Oh, that.