Also a factor is if you are looking to do a 1031 exchange on these properties and tax defer into other properties or you want to sell and cash out with paying the capital gains tax.The timeline you want to accomplish this in will also determine options.Determine what you have and who the target buyer is.Look up Chris Clothier on here.

The other factor is she is really motivated by "INCOME".  

Not that it matters, but she left after he the factory closed, they filed bankruptcy and he lost his house...

Another factor is conversion.

They are working at a local factory but their Socials are invalid.

FYI, I used to work at a window factory in college and the owner once told me that Argon was a waste of money, only because according to him it's just a matter of time before it leaks out.Thirdly, check the efficiency of the furnace.

Your primary decision factor is cash flow, if you are financing the investment property. 

I am an out of state investor, so understanding what materials work best in an Ohio climate would also be a factor I would want to weigh.Any opinions or comments would be appreciated.

A big factor is whether you'll be renting the additional unit(s) short or long term, that can greatly effect the potential returns.

There are other reasons why people rent as well however, I would argue that bad/no credit is the largest factor.  I