The existing walls are loaded with old awning-style windows.Things I don't want factored into this estimate:* Finishes: tile, baseboard, paint, etc. 

I can only echo everyone else about your writing style and humor.

It is 2 pole barn style buildings, each 30x40, one with concrete and heat, and the other with a rock floor (Cold Storage).

I say the answer lies in between- you should monitor environmental changes as they occur and are forecast to occur, and as an investor, hedge against those changes (however big or small those may be). 

Some of the the best ways to find off market commercial and multifamily properties is to compile lists through a paid service like List source, Reonomy and CoStar or you can use free resources like Loopnet, CREXI, Craigslist, tax database, brokers, property managers, title companies, environmental consultants, building inspection companies, appraisers, landscapers and other companies that service commercial and multifamily properties and driving for dollars.The real key is in how you approach the owners and then the follow up.

At this point, my investing just icing on the cake and will help my family and I afford a better life style and eventually help to lead me to financial freedom.

You can make a difference in your life style with just a few properties.Tax liens are a tough way to make money in real estate. 

You may need to also prove the soil is not contaminated by doing environmental testing.

This might also give you some control on the style of building that gets constructed to replace your house since different developers use different plans, etc.5)  Make it clear to interested parties you are not doing a distress sale and the home is in good condition and price needs to reflect that.5.5)  Try to avoid middlemen.   

A few grand to replace it.I power washed an octopus style duct system to save $600.