EDIT: WTF? Section 60.11
https://mf.freddiemac.com/docs/chapters/mf_guide_ch_60.pdf
Is that not sufficient for you?
You don't seem to get it - there hasn't been a "report format" for 15 years. The level of
reporting detail is a function of the scope of work you are supposed to agree as part of your engagement. No matter what the level of reporting detail, your work file must contain all relevant support and methodologies used in developing your opinion of value. You can give a verbal opinion of value, but if done in the capacity of a licensed appraiser, that verbal opinion has to have a complete work file behind it.
The only difference between a restricted appraisal report and an appraisal report is the former must specify the intended users specifically while the latter can include broad intended users like "and/or assigns". For both report types, you must specify what you report and the level of detail (in accordance with USPAP).
How do you pass your USPAP update class without understanding this?
What if the estate in question has, say, 10 Class A apartment buildings in Manhattan and 5 Class A office buildings in the Financial District? In the case of the former, you don't have a 25% vacancy rate (arguably higher) and have no need to perform a fundamental market analysis. In the case of the latter, you would have a hard time claiming your report is credible without performing at least a Level C market analysis. The apartments are rather simple to appraise without extensive reporting necessary as the market is stable and demand remains high. In the case of the office buildings, a credible report that is USPAP compliant is much more complex.
That said, the number of times I've seen even a basic attempt at forecasting demand and capture rates is rare. Most MAI designated appraisers probably have never performed a Level C market analysis except for their demonstration report. In general, I would say appraisers have little to no understanding of supply and demand dynamics.
For most assets, those dynamics drive the extent of research analysis you must perform.
But for the last time, no matter how you convey your opinion of value, your work file must have everything necessary to support that opinion. There are no shortcuts in appraisal methodology, only the extent you report your research, analyses, and conclusions.