there's a ton of knowledge here in the group, other's already mentioned the library of books published by BiggerPockets like Avery Carl's "Short term Rental Long Term Wealth" helped me at the beginning. 

I've done extensive research on this and am about to publish on a blog on this very topic. 

They publish the national average mortgage rates along with articles about rates and housing. 

The last single point source I have was published in I believe 2014 - so it’s hopelessly outdated.  

RentCafe publishes a rental competitiveness index, that gives you some idea about rental demand.

I enjoy a good book real estate book as someone took time to publish it.

Quote from @Wendy Patton: Do you have experience and let me see the financials for those projects Wendy, did you ever publish an update of your book?  

So I would recommend you explore that option for yourself.Also, make sure you check out BiggerPocket's househacking book by Craig Curelop.https://store.biggerpockets.com/products/the-house-hacking-s...I also have a book (published by BiggerPockets) that you might find helpful.

Whose the say the new investors is what's been preserving the notes payable from Jan 24-fwd.

I can tell you that being a passive investor provides zero training for operating a property.Also, I've never seen anyone publish a pro-forma 30% IRR.