If a kitchen has been altered, is there an extra bathroom? Based on what I have seen locally, the tax assessor might believe there are five units in a property, based on some original plans going back many years, however, only four units were actually built. Bottom line, the bank and the appraiser want to determine what is actually in existence, as opposed to what a third party thinks is in existence. If you find there are four units on the site, discuss the five unit misconception, then value the existing four units. One paragraph should suffice. BTW, you need to measure all the external walls, then on the interior inspection allocate all the space into the what the units comprise on your exterior sketch.