(this rock wool was on the interior ceilings of the house and zero insulation on the exterior walls where I wanted it!)

IF its more than the 200$ that you'd get for sprucing up the interiors then I would leave the 30k put. 

I am not a n the KC market, but there are a few factors to consider for interior paint.Are the walls paint ready?

Anyone had any experience with the thin interior wall homes?

Most lenders want an appraisal and want interiors you can't blame them.. on top of that your asking for a low balance loan that most lenders wont do.. 

That depends on who the tenant is national,regional, or mom and pop and if they are freestanding STNL or inline MTNL space.If inline the spot they are wanting matters.Generally the owner wants to control the interior TI for the quality of the build.

And "having the keys" gives a small implication that you can give me (an investor) access to the interior of a secured property.

I have purchased an airless sprayer and will be painting the entire interior myself.

So here is some basic information- I have not been to the property yet but I will go see it within the next few days. from the pictures I have seen it looks like the entire interior may need redone such as new flooring, paint, counter tops etc.. it also will need an HVAC along with redoing a non attached garage or completely tearing it down.

All the interior walls(partitions) are also block.