All the calculators show closing costs, and I can estimate them based on the way I have purchased and sold in the past, what’s confusing me is how to know what I will be paying in the scenarios I posted above.

These loans are a great tool if you don't have a lot of personal income, or have a high DTI.  

We both have experience in the single family realm having bought and sold several single family houses each on our own using conventional financing.

They don't want to sell at a discount, and they're willing to hold onto it until it can either produce cash flow or sold at retail. 

So you sold for $300 and subsequently bought for $300 (from the QI) and you have completed a successful 1031 exchange. 

@James Clements I sold it on terms.

I don't live in the US so we don't have the websites / tools ya'll use to do market research (e.g. to know whether a property was sold brand new or rehabbed).

My very first deal was a foreclosed mobile home for $4,500 that I sold for $20,000 - the best deal I have ever made profit vs. investment.Consume books, read posts, listen to podcasts.

A guy I met recently has sold his rentals this year, and is getting ready to take a tax hit.

The purchase price is roughly $120K less than the lowest priced property that sold in the area this month.