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Deleted member 130081
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I have a property where the site is irregular shaped. The Assessor does NOT have square footage for this lot (leading me to ask, how the hell did you value the lot with no square footage? .... still waiting for an answer on that but am betting I won't get one). I have called everyone that should have this information and the County says I have to get it from the Assessor, the Assessor says get it from the County... long story short, I need to get the site square footage in order to complete the report (OBV). I can go on the GIS and get an "estimate" but then I'd be making the assumption that it is correct in the report. How would I document such a thing? There are times when we have done everything we can to get the info we need but you can't keep delaying the completion of the report.
Whoa there partner! This is far from an extra-ordinary assumption!!! Note the "extra" ordinary for starters. Then consider that you have not made an assumption at all, rather have calculated a reasonably accurate measurement, based on a reasonably reliable source! Appraisal does not have to be so perfect!!! Unless you have reason to believe the GIS is inaccurate in terms of defining the site boundaries, the GIS measurement you made will be quite adequate for appraisal purposes. In fact, going to the GIS and measuring for yourself instead of simply taking the assessor measurement at face value is prudent appraisal - pat yourself on the back and file this one as done. What I do is take a screen shot of my GIS measurement, effectively showing the calculation as a verification of assessor data - then I use the assessor data, unless the assessor data is proven to be significantly off.
All said, while GIS is awesome, it can be in error sometimes. Sometimes this will not be readily evident with clues, but most often it is. If you really want to be 100% sure every time, dig into the legal description and plot/verify the boundaries (have fun with that).
Does your market really require adjustment for differences of a couple hundred or even thousand feet of site? I only find this level of refinement needed on super small city lots. I generally find little to no difference in larger sites. Most buyers don't sit there and say, gee, this lot has 23000 sf and the other one has 24000 sf, I better adjust my offering price! Most buyers say, the lot is small or the lot is large or the lot is just fine!!! Just because the stupid grid requires you report these sorts of differences in terms of sf or acres or whatever doesn't mean the market gives a crap or looks at it the way the form is formatted.