Building codes and permits are primarily a city function, with some input from county level on certain subjects, such as Septic Systems.Primary contract will be in the Planning & Zoning Function of the local city.  

@Cole GreeneI would look at bumping both levels out. 

I own Donna Farrow & Co. 400 plus units under management---- Many investors are winning here--- but I will be upfront and honest--- this is not a "pretty house" market...

I've been pre qualified for a loan that would let me purchase a property in this price range (130 K) for a residential unit; but because the bottom level of the 4 plex is being used for commercial purposes, the loan I need will have to be for a commercial property.  

@Jordan GobelyComps are best found by bed/bath ratioConditionDistance from subject propertyAge of propertyStyle of the property, split-level, ranch, etc.Then square footageLot sizeI work with a lot of starting wholesalers as well.

I do manage the property remotely and only come to town to solve a significant problem that is too much to ask of a co-host.

I’m curious on two levels- 1) just to see how this process goes and turns out2) we could maybe buy your interest now if you want out

Will depend on each individual's comfort level. 

I'm thinking about going through my old associate(who was an employee of my current manager).

Priceless info for real estate investors at any level.