Personally we recently sold one of our properties with the sole purpose of paying off a loan of ours.

That could work if you find the right person.

Personally, I would keep the property but I don't know your situation and if you could better use the money elsewhere.

I can't say when that will be but 4.125 is quite a lot depending on the rate you get.I personally want a hassle free funding experience and the lower rate.

I personally believe his contract job contract got cancelled as i know others from his company left that same week. 

I personally don't like exclusive by agreements.

They say the average amount of water per day a person uses is 80 to 100 gallons , Lets call it 60 to be conservative .

For my personal portfolio I use a modified spreadsheet amortization by VERTEX, available in Google Docs.  

I personally would only reno to add additional living space and leave the rest as is.

While I've never invested personally in Detroit, my usual word of caution to investors in these "lower cost" markets is that while cashflow is great on a % basis, make sure to look at the actual quantity of cashflow.