Your supervisor's reasoning as to the definition of "residential" is correct... as it is a 1-4 family residential property and should be coded that way as opposed to commercial property. However, the assumption that any and all "residences" require disclosures is inaccurate. Even if the property was a single-family residence owned by an individual, the fact that it is a rental property excludes it from the "consumer" disclosure requirements.
I am not sure about everyone else, but we have a coding system to break down all code 1C2A's for the call report among owner-occupied, rental, etc. to clarify this on our system.
_________________________
In the end, it's all just a bunch of paper....