Be confident, be courteous, and time will teach you what works based on your unique personality and skillset.

Quote from @Victor Tofilski: @Joe VilleneuveThe other unit was a unique circumstance the tenant only needed a place for 6 months before he moves again so I gave him a different price to account for future vacancy.

Yes, because Private Money infers that you are in a negotiable deal where your project can be outside the box and you can negotiate unique terms with a private individual - that - or a big box lender with strict rules and guidelines. 

- You can find this out by going to Zillow, selecting your Zip code or Neighborhood, and looking at current rental listings.

Understanding the intricacies of the area they’re building in is crucial, as it reflects their intentional selection process.

I know that varies but he just has selective empathy.

You'll likely find it easy to find people who will tell you what you want to hear, but you really need hard facts not speculation.But for some speculation, if you're talking about the Nantahala River or Little Tennessee, sure I think you might be able to do $22K/yr, but not much more, unless perhaps the places are uniquely styled. 

The unique part is the additional basement garage.

The model you should go with will ultimately depend on what the group is optimizing for (cashflow, appreciation, tax optimizations, diversification, and maybe even a little bit of social value doing something fun, potentially lucrative, and unique w friends).  

Include the finish selections as well so they understand what is being installed (Carpet is cheaper than hardwood and if you install hardwood herringbone thats even more expensive).Then you have the general terms as part of the contract which are insurance requiremens, licensing, schedule, indemnifications, lien waivers, case of default.