If no building permits were issued and inspection approvals were not conducted then you potentially have an illegal non-conforming use where they could demand you de-convert. 

A lot of them will be discovered when you conduct a more in depth investigation and during the due diligence process.I will provide a response to each of the 15 items you listed.  

However, anything that is not a life safety issue or other potential hazard that will land you in court should simply be marked "noted" on the list.I would also urge you to conduct a pre-move-in inspection done EVERY time you get a new tenant and conduct a pre-moveout inspection at every lease end as well.  

The way I conduct my business, I could absorb a market pull back.

You can still conduct business but not open new account with a bank for example . 

As an engineer, I conducted extensive analysis.

Of course the investor wants a deal it's all in how you present it and conduct yourself that makes it  a painful or pleasant experience for the broker/agent. 

Nothing is going to be having a real estate agent you trust in that particular market to conduct what most call a "competitive market analysis" to drum up an ARV for you.In the past I have used Redfin, Zillow, *******************.com and others.

This exposure will give you an idea about the different roles required to conduct the business.

Do not take any one else's word for "it should be alright"  Conduct your own due diligence.