Hey @Aaron Cooke - Congrats on what looks like a successful deal! 

I think it depends on the market.. they approached me on a furnished rental I had in Vegas (Summerlin gated community A class)  We got basically double or a little more of the normal rent..

What is a fair offer to make to that GC, and what kind of deal should I not accept?

Cost segregation is a great tax strategy when applicable.

I would start with the Fair Market Rents (FMR) in the county where the property is located and use that as a basis to negotiate from there.Thanks Jaycee, are to referring to the HUD website? 

So I have a question..... 

Here's an article with things to consider when selecting a cost segregation company.

Purchase price: $360,000 Cash invested: $100,000 This is a 20 acres of land mixed use Commercial or Residential.

If the lap, you might just be acquiring to acquire and it could be a headache to move and get going again.

Did you find a good credit screening agency?