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

That could work if you find the right person.

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

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.

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

I personally don't like exclusive by agreements.

However, after learning about house hacking, I tell every high school/college aged person I meet or know to do this because of how great it is!  

Since you have good personal credit but little capital, consider leveraging strategies like house hacking, partnerships, seller financing, or DSCR loans that don’t require strong business credit.

@Cameron NordinA cost segregation study accelerates depreciation by classifying certain building components as personal property or land improvements, allowing them to be depreciated over shorter recovery periods (e.g., 5, 7, or 15 years instead of 27.5 or 39 years).By accelerating depreciation, cost segregation lowers your tax basis more quickly than standard straight-line depreciation.

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.