At this stage that should not be your concern as an inspection  and a little investigating on your realtors side will expose things.  

It's intended to be a humorous expose of my failings (learning opportunities??)

Are they doing everything they can to expose properties to the widest possible market?

The chimney is not exposed in any unit and has been drywalled off.

@Daijamonet CookAaron gave you great advice.Volunteering for Habitat for Humanity builds can expose you to some great stuff, too.

Hi Rudy,I have no idea what would add value in your local market niche, but if it were mine, I'd strongly think about keeping the marble exposed and use a commercial floor mat service to provide and clean the floor mats. 

If every other neighbor has a tarp on the roof or 3 junk cars on blocks and exposed surfaces, I reexamine what the "after is"Oh and 6 months is my preference but a year is maxNot sure it helps but good luck!

- possibly exposing my own insurance and business to risk Try to find a company that will write PPI on those within mobile homes?

I’m thinking about all of my undergarments being exposed to spores.

You might see if cable TV/internet is available.You might check if Natural Gas service is available by calling that utility unless you know Propane or all-electric is the norm in that area.These are the first steps in my area.