Just curious, there's always a way to build what you want....maybe use 10' walls?

Then you can start collections on that judgement but that is highly unsuccessful, difficult and generally a waste of time and money on most people. 

I am a first time home buyer and am planning to put an offer for a duplex which has two units separated by a wall.

Has probably heard it before.He hadn't even seen the ad so I asked him if he ever heard of the sales expression, seeing when you throw it, how much s**t sticks to the wall.

Lending isn't an issue.I think the toughest part is finding a contractor who I can work with on a small multi-family...two to six units.I'll state up front...I'm not interested in wasting anyone's time.

Lending isn't an issue.I think the toughest part is finding a contractor who I can work with on a small multi-family...two to six units.I'll state up front...I'm not interested in wasting anyone's time.

I have never seen the inside of this wall that separates the laundry room from kitchen. 

Same goes with walls/bathroom/etc. and over time I’ll be able to see a property and have some form of idea about rehab cost.

@Jim Davis Water leaks must be seen to as water damage rots wood and ruins wall board.

if repairs are not made or the COC is not obtained in short order you can lose the rent as well.Hiring a lawyer is a waste of money at this juncture and you should put all of  your resources into fixing this home up, getting the COC and do things properly.