I also can't imagine going through all that work with only a 50$/month margin for error on positive cash flow. For a single family house I wouldn't even consider it for anything less than 300/month, small multi better be 100+/door after refi before I'd ever consider doing it.
@Jordan Moorhead, I agree, extremely difficult to make it work in the twin cities based on everything I've seen as well, but entirely possible if you get outside of that immediate market. I invest a couple hours drive east of where you're living and it's certainly possible with excellent cash-flow following the refi, even more so if you get further to the east side of WI.
Two recent examples:
Purchased a SFH student rental for 85k that was mis-labeled as a 3-br (it had 4) and was only getting 900/month in rent, appraisal came back well and instead of bank doing a construction loan they lowered my down payment to 10k and had me self-fund the rehab. I put 11k into it with a new kitchen/bathroom/flooring and got it on the following student cycle with decent management. Signed leases at 1500/month for the following student cycle, refi-d and it appraised for 130k. I walked away from the table with 30k at refi closing and it's also on a 10 year lock and cash flowing 350$/month.
A more recent example, I purchased a quad in June for 162.5k, seller took a 10% note and I had initially 8k into the deal (85% LTV), rents were sitting at 1600/month. I put around 7-8k into the property, got decent property management, and now rents are 2650/month. I refi'd in January and property appraised for 215k. I pulled 20k of equity out, payed off the seller's note, and now have a 10 year lock on a property that is cash-flowing north of 500$'s/month.
I understand the over-leveraged argument and agree with it, but I have had banks that will do longer-term lock's for a little higher interest rate, I just make sure it makes sense with my numbers and they need to not just cash flow after refi, but cash flow well (I don't consider 50$/s for a SFH cash-flowing well). I have capital to buy more properties, but I'd rather use other people's money and let the banks see the amount of reserves I have.