House hacking is out of the question, I have two young children and a wife who will truly think I have lost my mind if I suggest we move and / or rent out a portion of our house.

I would look for a bunch of Sub To Deals with 2-3% interest rates ...... then rent out for cash flow and huge equity build up when rates are really low (check out amortization schedules and compare 2-3% vs 6-7% with the same balance and length of time - check out the principal portion each month - the lower the rate the higher amount goes to principal PLUS better cash flow).

Also, whatever monthly payment your bank determines, i.e $10K LOC at $300/month for x amount of months, that will eat up a portion of your total contribution.For example, if your getting $400/month from your investment vehicle, plus $2,000 of your personal cash flow, that $300 bank note will eat up a portion of your $2,400 payment, and the remaining portion of that $2,400 will be applied to the LOC principal. 

I have 5 section 8 tenants and each one is very blasé about paying their portion.

It does later say in the agreement that it is:"binding upon persons who own, lease, sublease, or occupy any parcel or portion thereof"The inclusion of which seems to imply that long term renting and/or subleasing would NOT be commercial use.I'm trying to figure out if I'm taking a significant risk buying this property for use as an STR.

If you have good credit and the liquidity for your portion of the down payment plus fees, closing costs, and 9 months of payments in reserve - then you can get a DSCR no problem.

*PS  Many people do not realize that the City of Detroit is a fairly small portion of Metro Detroit.

Give them a portion of the profits from the STRs and have a buy-out clause when you have the funds to refinance.I am sure there are many other potential options for you to look into, but just off the top of my head these 5 came to mind.

After Maverick said no to our request to help us with ~$6k, I also approached Jay Walsh after the buy-back to help us by returning portion of the money that was owed to us.

Be upfront about your goals during interviews to find a good fit.Broker's Share of Commissions:Yes, brokers generally take a portion of any commission you earn, even if it's from a property you purchase for yourself.