Back of the napkin calcs are showing ~25% COC yields with 20% down, and almost 40% with 10% down.

Rinse, repeat.Some quick back-of-the-napkin math on this.

Open to input for sure.I am trying to educate myself in this space so with a couple of podcasts under my belt and some grassroots research this is the napkin math I've done.

We used the “back of a napkin” method to figure out what could work before finalizing, really happy with how it worked out!

I also heard that you can literally just use napkin as a Purchase Agreement.

I use a back-of-the-napkin number of 25% of the rent for those four expenses. 

Assuming the tenants pay for water, a quick, back of the napkin calculation of avg. lot rent x occupied lots x 70 (conservative expense ratio) gives you the price you should pay for the park at a 10 cap ($227,500).

Quick napkin math shows $8,000 per month in cash flow = $96,000 annually.

@Monty McLamb there is a basic "back of the napkin" evaluation that will usually tell you if the deal is worth pursuing.

You can require that no "offensive" odors be detectable in common areas or outside of the residence, and that proper sanitary conditions are maintained.