I could very easily rent the property again but my plan was to sell it and use that cash for the next investment.  

You will need to factor in rehab costs, which could easily eat up another $50-75k depending on the condition.

Is there any way to easily find out what areas around detroit are what class?

You could easily buy land that is zoned for multi-family and find a lot where you could build 4-8 townhomes.

. :-) Even if you win the war, loosing the battle can easily wipe out all your profits and more.Think about that recent CA AirBnB case where the lady was in the guest house for almost 2 years with no rent?  

I use google drive for all my scanned business files, so I can easily upload my receipts for transactions/expenses. 

This can easily happen when the person valuing the property does not account for differences in the subject property and those chosen as comparables.   

The reality is that makes the LLC easily pierceable, thus giving you no protection. 

But the above statement is easily used generically for any market. 

Consider having a lock that can be easily rekeyed or a pin code enabled lock such that you can easily change things, especially after a drama filled hissy fit where one tenant suddenly leaves out of anger/frustration.8.