I literally just listened to a BP podcast yesterday with a guest who does rent-by-room with more standard 12 month leases, not the short term AirBnB model.

@Sami Gren there is no problem if your business model is to pay for those type of things and your consistent.

Also, consider bringing in park models. 

And as you scale your model does not change, you do not buy properties you can not afford, but your terms for “afford” become different.

This has limited us to typically 1 BRRRR deal, 1 Fix and Flip deal per year, or 1 note deal.With this model I'm limited to the equity I already have as a limit and have to free up the line to use it again. 

We have a slightly different model though.

I've spent several years now writing software to help myself (and to educate potential clients and clients through classes, podcast episodes and books) model real estate as a  tool to achieve financial independence and to fund retirement.

Best practices depend on your business model and are learned over time through experience.

The other way is to do the “cash flow per door” model.

I agree that's the best way to calculate your returns but when you are evaluating a deal on the front end to figure out if it meets your 30% gross margin and 40k net profit parameters, what figures do you plug into your financial model for Commissions,closing costs, transfer taxes, stamps etc to confirm that the deal pencils out?