"... and it works well in unusual situations where the sales comparison data is either hard to come by or not the only thing that's needed. "
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Rick,......Agreed, much of what you shared may well be true, and so I quote your own words.
While we're here, if you would, about this house...
Answers:
The neighborhood goes back to WW2. The house was built in 1950.
There are no vacant lots. There are a few "teardownable" lots (being marketed as "land for sale."
I didn't ask about the length of time of the renters, but it was vacant in 2006 when it was listed for sale (for location and lot size)--and did not sell (for 599). The renters have a lot of stuff; so they have probably been there for more than a year.
These "students" are young professionals. Do they throw a party? Sure. But I'd probably go

The school they are near is the law school ... That said, the house is about as well-kept as 4 unrelated males are capable of without any maid service. The bathrooms need a visit from Mr. Clean.
No income approach was provided. Field left blank. Canned statement in Reconciliation stating that Income and Cost were considered ... however "not deemed reliable."
Just noticed the guy has a canned statement about the 5 comps ... there are only 4
Most single-family homes (btw, this is a rambler with a basement, not a split-foyer as I had stated ... no real difference in appeal though), but most SFRs in this older, desirable, good-school-district hood ... are lived in by the owners. Comparable rentals would likely include townhouses.
I haven't completed the report yet--just saw the inside last night in fact. But I will probably make an income-capitalization approach--especially considering how much data there is for the market area (if not the neighborhood).
I agree with your income-cap statement, and what the client is paying for is information that he is likely going to turn in to be reviewed by someone as qualified, and probably more qualified than me. Two of the best instructors I know work for the IRS. I do, however plan to show the cost as well. I mean ... it's what they are going to destroy.
As for the owner getting a tax writeoff, I really don't understand that part. If you come over to my house and take a look around, you will quickly realize that accounting skills haven't been my forte in life

I only know what the client told me, and that's that he intends to turn this report into an accountant ... for the purpose of a tax writeoff--something about how he is able to deduct the "materials." ... He's talking about the carpet, the brick, the vinyl, the plaster, etc.
There was no major rehab done ... at least not since 1970 ... yet the house is in livable condition. If I were to move into the house, as-is, tomorrow, about all I would do is recarpet and paint. I would, of course, order a home inspection in case there were any bigger issues.
As for value ... he's going to receive, from me, "market" value. But market value can include, and benefit from, costs, and as you pointed out income capitalization.
Northern VA, and Arlington in particular, benefits from having a lot of sales to draw upon, and very well-kept records. Like I mentioned, I haven't gotten too deep into the report yet; however, I have confidence that there will be a lot of comparable sales, and I have already found some lot sales. Rentals will be available, although, single-family/detached rentals are less common here. What I have found in regard to rentals is that sqf and beds/baths are key. I realize that in other areas garages, lots, etc., weigh in more heavily ... and obviously, my first choice will be to find rentals that are sfrs .... but I am going to consider attached housing as well.
With regard to the order ... The appraisal was ordered by the same bank who ordered the new-construction appraisal.
It is about as canned as canned gets. It states there is no MLS info ... when in fact there is a ton. It states there is no functional obs. The comments section on Page 3 reads like the fine print on an attorney's letter ... basically absolving him of any incompetence ... which might come in handy in his case
He was asked, specifically by the owner, to provide a cost approach, and his response was lengthy and painful to read. He was also asked to show support for the site value, and his response was that he relied upon the tax assessor.
Basically, the guy filled out a canned form with a few extra check marks.
As for what he was told ... and this is hearsay ... the guy wanted a report to turn into his accountant. So the appraiser did the fannie form. When the appraiser was further asked to provide the cost ... he dodged.
The owner, in this case, was within his right to complain. He didn't complain about the value ... he didn't complain about the length of time it took to receive ... he complained about receiving a canned form that he doesn't know how to read.
You know this from your training ... you write your report to the level of the intended user. The intended user is supposed to understand the report. How can this happen when the appraiser doesn't even understand his own report? When the appraiser's fields are all the same as every other one of his reports ... ALL CAPITAL LETTER, DODGY, GARBAGE
As for the class ... I can't say enough good things about it. Some people think that report writing is all about making you take your two to four-hour process take three days ... it's not that at all. It's just about at least knowing how to do something. I mean, if I told you I never had any canned responses for things, I'd be lying ... but isn't it funny how all of Appraiser X's neighborhoods are near the same good schools and shopping? I mean, the street photo is nice, but can you give me a tad more? It takes 5 minutes.
-R