Either he's paying retail for all the plumbing accessories or he bought too much product ( perhaps for his own house or relative) either way, I agree.

In this case it sounds like your 4-plex.In my area the tax accessor is not going to look at sales as much as they are going to look at comparable properties.

Here's a brief overview of my situation:Project Details: I purchased a single-family home and plan to build 6 accessory dwelling units (ADUs) on the property.

Residential-Conversion-Less is defined as, "Structure with more than 1 single-family unit, but less than 5; usually self-contained, under 1 roof; few accessory uses; 1 unit may beowner-occupied; original primary use not multi-family."

I have an idea to build an accessory dwelling unit in the form of a garage with second floor apartment and converting my home to a multi-family that can easily be converted back to a single family.

This is the most cost effective option.You can go the Accessory Dwelling Unit (ADU) or the Accessory Family Suite (AFS) route.ADU/AFS are two similar routes that require you pulling the permit for one of these designations and getting inspections along the way.

Maybe he doesn’t want to be an accessory to negligent homicide. 

Accessory Dwelling Unit.

I am currently building at Detached Accessory Dwelling unit (DADU) behind a property I am about to rent.

I'm looking at investing in the North Bay, and the numbers work (on paper) by adding an Accessory Dwelling Unit.