Key factors in analyzing a multifamily deal: The two most sensitive inputs will be your vacancy factor and your cost of capital.

I give the warning because these tenants live in a little bubble and aren't considering the costs and inconvenience of moving.

Loans from the FHA, online investment groups, middlemen, rent-to-buy deals, ready-to-rent homes, and borrowing from private lenders can cost less at the start, grow in value, and give you a steady flow of money.

There's preferences.If i have to choose, I would choose either AppFolio or Yardi Voyager, but these can cost anywhere from $14K to $150K. 

Some lenders will require as little as 15-20% down (of the total project costs.) 

Also run a few scenarios of costs and see how much over budget these repairs can go before you don’t think it would be a good deal anymore.

Insurance has gone up a lot and costs of repairs, etc. 

First flips cost twice as much as you think and take twice as long, every time.

IN our price points 20 % of the build cost is way more than we are paying  but we are giving him 30 houses a year to build.. so there is that.

And if they did, it would cost you way too much.You are behind the eight ball, which is probably why you are here, but it's not adding up.