I use Buildium for tracking rent, fees, leases, and collecting online payments, but I don't use their reports for much, as I end up copying my online banking each year into spreadsheets.I've been using Rental Hero for the last hour and already impressed with it.

This friend and I have done 2–3 deals together, and there’s never been a payment dispute or even a hint of cutting him out of something.

You'll need something like 125 units netting $200 per door to get there, that's about 10 million worth of multifamily in today's money, so you'll need about 3 million in down payments.

Usually the hardest part is coming up with the down payment.

There are mortgage recast calculators online or you can reach out to your lender.P+I payment will go from 2155 to ~1800 given the numbers you provided.

Wondering if you have advice on me just being the bank, where I purchase a house and structure a rent to own with him and have him build up a 30% cash down payment and some equity and then me sell the house to him at a locked in price.  

The plan is not clear, but hopefully there will be payments directly to landlords. 

I offer an online payment portal to submit rent payments via ACH or CC - they "couldn't figure out how to use it" so I set us up to accept Zelle payments.

We have secured a home equity loan against our home (which we own out right with no mortgage payment).

Quote from @Jack Townsend: I heard David Greene mention a loan product that only requires a 10% down payment on the purchase price and 10% of the rehab budget.