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. 

The one pictured below is okay at first glance, however the interior is nasty with probably 40-50 years worth of cooking grease/exhaust built up.  

Can someone point me in the direction of a great interior designer in Seattle?

Some condo's it's interior walls, some it exterior walls that bound your ownership.