I don't do app development but I was told for most sites and businesses it's a lot of work for low payback.

If you need to get it rented fast, a great property manager would list the home for $2100 (below market) and get several quality applicants competing against each other to drive the price up to the max so you don't risk vacancy by starting out too high and gradually reducing to find the sweet spot.

Start by making a low offer to the tenants and see if they’re interested.

Low cost + high rent/value ratio.My market of Middle TN doesn't have any livable property for that price and the 1% rule isn't very realistic. 

Again, treating folks with housing support funds with the same dignity and respect as everyone else, usually nets quality clients that listen and do their best to follow the rules.

Quote from @Michael Daniel: Purchase price 70k currently pulling 900 rent ARV 110 - 140k, rehab about 25k @Michael Daniel That rent sounds too low for that ARV.

Underpriced, underperforming, value add, 20 units, cash flow potential, low risk How did you find this deal and how did you negotiate it?

With any investment there are risks, but how much control you have to mitigate risk is what makes the income snowball a low risk strategy.

The denominator in the calculation is your capital/equity and with no debt the return on your existing equity is low.

I kept the rent low because the tenant was there for a long time.