Selling to buy new properties has a lot of costs involved with realtors, titles and capital gains taxes (variable depending where you live) so that should all factor into your opportunity cost ROI calculations.

But the problem is that I don't understand how could I ''jump'' into two-way dialogue between potential buyer traveling to see the RE and an agent, without my physical presence, and act as a middle-man to gain profit from the difference?

The fresh finished rental is worth more to an investor than a vacant mls in the same way as wine is more valuable than grapes. 

I would love to connect with any experienced investors and agents who have had success in Detroit so that they can provide me with the valuable insight that comes with living and knowing their city.

Make an income account gain/loss on sale of property and sub accounts Gross Proceeds from sale and Cost of Property Sold.

If anything, just to gain experience that goes into a full rehab so we know how to communicate what we want with future GC's.

In Job CreationCOLLEGE STATION (Real Estate Center) – The Texas economy continues to outpace the U.S. economy in job creation.According to the Real Estate Center’s latest Monthly Review of the Texas Economy, the state gained 285,200 nonagricultural jobs from February 2017 to February 2018, an annual growth rate of 2.3 percent, higher than the nation’s employment growth rate of 1.6 percent.

If you do agree to a 10 year term, you will be gaining $630ish per month in principal reduction vs $345ish per month on the 15 year term. 

BP is an excellent place to gain knowledge about the business and also for solid advice.

We learned a valuable lesson and I'm sure the first guy did to, do your research and take your time knowing what you have before you wholesale.