Although we did extend it and we did negotiate that our option payment would be a full credit to the purchase price so NO INTEREST Carry for us..

I will most likely be using a HELOC also.I have good credit and quite a bit of equity in my primary so that is my way out.How far can conventional borrowing take an investor before the banks stop handing pit mortgages?

Here's a crucial tip: Choose your market wisely!

So for example, a primary mortgage, secondary mortgage, and home equity line of credit would all transfer to the buyer?

@Greg Scott thanks for the tip.

Any tips would be great!

I've gone through eviction court proceedings, ran thousands of background/credit checks for application, made numerous leases, dealt with repairs and whole house renovations when a few tenants nearly destroyed properties, and worked with property management companies on the HOA units. 

Some Type of partnership or a 50/50 LLC member ownership with his brother and can buy under that LLC because both of their credit scores are 700+, and 3.

Many states require a credit report review 

What you get the money for from your lender based off your qualifications like credit and loan to value ratio, with no cost would be called "par" rate... and from there, you can either buy down to get a lower rate, or you can take a higher rate to get a credit applied to the cost of your loan by the lender.A par rate is simply the rate that you get without having to buy the rate down while also getting no lender credit.