I can bet if inflation runs then Boston prices skyrocket, but I doubt Austin does.

If your goal is cash flow, then your best bet may be to live in it for 2 years, and then take that tax free gain (250k single person, 500k married) and buy elsewhere. 

(I know a lot of investors who are doing this, but I've been surprised to find out that it's a new concept that others haven't considered.)The more units, the better in this scenario because you can hedge your bets with more units.

Bet they're making their car payments (walking sucks! 

Then your best bet are probably community banks which have more flexibility (albeit worse terms) than larger banks and also worth looking into are DSCR lenders.

Well the bet I'm making here is that CapEx and repairs will be very low the first few years (honestly event he first decade), and once all the construction ends I will be able to increase my rent closer to market rent at $2k which will give me a better cushion.

Sounds like their combined income likely beats your other tenants.Your gut is probably your best bet and you need to go with it. 

Betting on future price appreciation and equity growth is just that "betting". 

DSCR Cashout is your best bet!

I'm sure there are other similar services out there. 2) DSCR loans would probably be your best bet.