These rebuild statements are legal opinions. Are you sure you want to issue a legal opinion? Or would you not prefer to refer it to the governing authority?
Of the many things we already have to do one that we should avoid is playing lawyer
In general, we make conclusions regarding the likelihood of legal permissibility many times. I hear the "we are not lawyers.." comment and I agree. But providing a conclusion regarding some aspect of the zoning ordinance is what we (as trained professionals) can do and actually do all the time.
One can always defer and recommend the client obtain a definitive opinion from whatever source is appropriate.
But I see no added liability in (a) including the zoning ordinance (by excerpt or reference; I prefer excerpt); (b) concluding what it says (and a phone call to the jurisdiction can usually confirm the conclusion... at least in my markets), and; (c) then adding in the report that the client is advised to confirm this conclusion if it needs an additional level of certainty.
"This is what it says, this is what I think, and this is how I'm going to go forward with it based on all of that. If you need more certainty, go get a definitive ruling from the jurisdiction."
Here, again, is another example where trained appraisers have an advantage over non-trained valuation sources. i prefer to use that advantage when I can. Of course, axiomatic to my advice is that the appraiser understands how to communicate analysis and is confident in their ability to make reasonable conclusions and comment on the limitations of the data. Anyone who is not comfortable with that level of perceived risk should just say "no"; go to the jurisdiction. I don't have a problem doing the research that is reasonable at my level, coming to a conclusion, and then telling the client, "to confirm what I've found, you should go to the jurisdiction".
But, that's me.
IMO, an appraiser is more apt to get him/herself into a bind by not researching and summarizing the research of an issue like this vs. researching it and summarizing the findings of that research; if the research is sufficient enough where a reasonable conclusion can be drawn, then I draw it. In all cases, I refer the client to the authority to confirm the findings if there are any concerns.