The third, I think I will break even or small profit, but it will be on the longer end of the hold, like 7+ yrs overall.I have not had any additional capital calls.

And many are very profitable with scale.  

While not impossible, you'll be paying a much higher interest rate for the loan than with 20%+ down and also you're likely paying some points or splitting the profit if for resale. 

Buy a property to live in, fix it up, then sell it later for a profit.

They just aren't that profitable.  

Some investors have found that working with the right team even in challenging markets can be a pleasant and profitable venture.  

I own a 3 apartment income property (almost paid off) and I wanted to ask you for some advice regarding acquiring more properties like this. would you suggest selling the income property and use the profits to acquire more properties or keep it and finance any new property with a new loan. what is more appealing to banks?

They want something with a profitable recourse would be my guess. 

Selim, first of all, congratulations on a profitable flip!

Ok so this would be profitable for a potential investor if you seller financed.